Mitsubishi FX1S Series Programming Manual

Programming Manual Manual number : JY992D88101 Manual revision : C Date : Sep. 2001 FX Series Programmable Controllers Foreword • This manual contains text, diagrams and explanations which will guide the reader in the correct programming and operation of the PLC. • Before attempting to install or use the PLC this manual should be read and understood. • If in doubt at any stage of the installation of the PLC always consult a professional electrical engineer who is qualified and trained to the local and national standards which apply to the installation site. • If in doubt about the operation or use of the PLC please consult the nearest Mitsubishi Electric distributor. • This manual is subject to change without notice.

Mitsubishi has a world wide reputation for its efforts in continually developing and pushing back the frontiers of industrial automation. What is sometimes overlooked by the user is the care and attention to detail that is taken with the documentation. However,to continue this process of improvement, the comments of the Mitsubishi users are always welcomed. This page has been designed for you,the reader,to fill in your comments and fax them back to us. We look for- ward to hearing from you. Please tick the box of your choice; Fax numbers: Your name.................................................... Mitsubishi Electric.... ..................................................................... America (01) 847-478-2253 Your company .............................................. Australia (02) 638-7072 ..................................................................... Germany (0 21 02) 4 86-1 12 Your location: ............................................... Spain (0 34) 93 589-1579 ..................................................................... United Kingdom (01707) 278-695 What condition did the manual arrive in? �Good �Minor damage �Unusable Will you be using a folder to store the manual? �Yes �No What do you think to the manual presentation? �Tidy �Un-friendly Are the explanations understandable? �Yes �Not too bad �Unusable Which explanation was most difficult to understand: .................................................................. .................................................................................................................................................... Are there any diagrams which are not clear? �Yes �No If so,which:.................................................................................................................................. What do you think to the manual layout? �Good �Not too bad �Un-helpful If there one thing you would like to see improved,what is it?...................................................... .................................................................................................................................................... .................................................................................................................................................... Could you find the information you required easily using the index and/or the contents,if possi- ble please identify your experience: ........................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... Do you have any comments in general about the Mitsubishi manuals?..................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... Thank you for taking the time to fill out this questionnaire. We hope you found both the product and this manual easy to use. FX Series Programmable Controllers ii

iii Guidelines for the Safety of the User and Protection of the Programmable Controller (PLC) This manual provides information for the use of the FX family of PLC’s. The manual has been written to be used by trained and competent personnel. The definition of such a person or persons is as follows; a) Any engineer who is responsible for the planning, design and construction of automatic equipment using the product associated with this manual should be of a competent nature, trained and qualified to the local and national standards required to fulfill that role. These engineers should be fully aware of all aspects of safety with regards to automated equipment. b) Any commissioning or service engineer must be of a competent nature, trained and qualified to the local and national standards required to fulfill that job. These engineers should also be trained in the use and maintenance of the completed product. This includes being completely familiar with all associated documentation for the said product. All maintenance should be carried out in accordance with established safety practices. c) All operators of the completed equipment should be trained to use that product in a safe and coordinated manner in compliance to established safety practices. The operators should also be familiar with documentation which is connected with the actual operation of the completed equipment. Note : the term ‘completed equipment’ refers to a third party constructed device which contains or uses the product associated with this manual. Note’s on the Symbols used in this Manual At various times through out this manual certain symbols will be used to highlight points of information which are intended to ensure the users personal safety and protect the integrity of equipment. Whenever any of the following symbols are encountered its associated note must be read and understood. Each of the symbols used will now be listed with a brief description of its meaning. Hardware Warnings 1) Indicates that the identified danger WILL cause physical and property damage. 2) Indicates that the identified danger could POSSIBLY cause physical and property damage. 3) Indicates a point of further interest or further explanation. Software Warnings 4) Indicates special care must be taken when using this element of software. 5) Indicates a special point which the user of the associate software element should be aware of. 6) Indicates a point of interest or further explanation.

1. Introduction............................................................................................1-1 1.1 Overview.............................................................................................................. 1-1 1.2 What is a Programmable Controller? .................................................................. 1-2 1.3 What do You Need to Program a PLC? .............................................................. 1-2 1.4 Special considerations for programming equipment ........................................... 1-3 1.4.1 Current Generation CPU all versions .......................................................................1-3 1.5 Associated Manuals ............................................................................................ 1-4 2. Basic Program Instructions ...................................................................2-1 2.1 What is a Program?............................................................................................. 2-1 2.2 Outline of Basic Devices Used in Programming.................................................. 2-1 2.3 How to Read Ladder Logic .................................................................................. 2-2 2.4 Load, Load Inverse.............................................................................................. 2-3 2.5 Out....................................................................................................................... 2-4 2.5.1 Timer and Counter Variations ...................................................................................2-4 2.5.2 Double Coil Designation............................................................................................2-5 2.6 And, And Inverse ................................................................................................. 2-6 2.7 Or, Or Inverse...................................................................................................... 2-7 2.8 Load Pulse, Load Trailing Pulse.......................................................................... 2-8 2.9 And Pulse, And Trailing Pulse ............................................................................. 2-9 2.10 Or Pulse, Or Trailing Pulse................................................................................2-10 2.11 Or Block............................................................................................................. 2-11 2.12 And Block ..........................................................................................................2-12 2.13 MPS, MRD and MPP.........................................................................................2-13 2.14 Master Control and Reset..................................................................................2-15 2.15 Set and Reset....................................................................................................2-17 2.16 Timer, Counter (Out & Reset)............................................................................ 2-18 2.16.1 Basic Timers, Retentive Timers And Counters........................................................2-18 2.16.2 Normal 32 bit Counters ...........................................................................................2-19 2.16.3 High Speed Counters ..............................................................................................2-19 2.17 Leading and Trailing Pulse ................................................................................2-20 2.18 Inverse...............................................................................................................2-21 2.19 No Operation .....................................................................................................2-22 2.20 End ....................................................................................................................2-23

3.1 What is STL, SFC And IEC1131 Part 3?............................................................. 3-1 3.2 How STL Operates .............................................................................................. 3-2 3.2.1 Each step is a program .............................................................................................3-2 3.3 How To Start And End An STL Program ............................................................. 3-3 3.3.1 Embedded STL programs .........................................................................................3-3 3.3.2 Activating new states.................................................................................................3-3 3.3.3 Terminating an STL Program ....................................................................................3-4 3.4 Moving Between STL Steps ................................................................................ 3-5 3.4.1 Using SET to drive an STL coil ................................................................................. 3-5 3.4.2 Using OUT to drive an STL coil................................................................................. 3-6 3.5 Rules and Techniques For STL programs........................................................... 3-7 3.5.1 Basic Notes On The Behavior Of STL programs....................................................... 3-7 3.5.2 Single Signal Step Control ........................................................................................3-9 3.6 Restrictions Of Some Instructions When Used With STL.................................. 3-10 3.7 Using STL To Select The Most Appropriate Program .......................................3-11 3.8 Using STL To Activate Multiple FlowsSimultaneously.......................................3-12 3.9 General Rules For Successful STL Branching ..................................................3-14 3.10 General Precautions When UsingFX-PCS/AT-EE Software .............................3-15 3.11 Programming Examples ....................................................................................3-16 3.11.1 A Simple STL Flow.................................................................................................. 3-16 3.11.2 A Selective Branch/ First State Merge Example Program.......................................3-18 3.12 Advanced STL Use............................................................................................3-20 4. Devices in Detail....................................................................................4-1 4.1 Inputs................................................................................................................... 4-1 4.2 Outputs ................................................................................................................ 4-2 4.3 Auxiliary Relays ................................................................................................... 4-3 4.3.1 General Stable State Auxiliary Relays ......................................................................4-3 4.3.2 Battery Backed/ Latched Auxiliary Relays.................................................................4-4 4.3.3 Special Diagnostic Auxiliary Relays .......................................................................... 4-5 4.3.4 Special Single Operation Pulse Relays.....................................................................4-5 4.4 State Relays ........................................................................................................ 4-6 4.4.1 General Stable State - State Relays .........................................................................4-6 4.4.2 Battery Backed/ Latched State Relays......................................................................4-7 4.4.3 STL Step Relays .......................................................................................................4-8 4.4.4 Annunciator Flags .....................................................................................................4-9 4.5 Pointers ............................................................................................................. 4-10 4.6 Interrupt Pointers ...............................................................................................4-11 4.6.1 Input Interrupts ........................................................................................................4-12 4.6.2 Timer Interrupts .......................................................................................................4-12 4.6.3 Disabling Individual Interrupts .................................................................................4-13 4.6.4 Counter Interrupts ...................................................................................................4-13 4.7 Constant K.........................................................................................................4-14 4.8 Constant H.........................................................................................................4-14 4.9 Timers................................................................................................................4-15 4.9.1 General timer operation...........................................................................................4-16 4.9.2 Selectable Timers....................................................................................................4-16 4.9.3 Retentive Timers .....................................................................................................4-17 4.9.4 Timers Used in Interrupt and ‘CALL’ Subroutines ...................................................4-18 4.9.5 Timer Accuracy .......................................................................................................4-18 4.10 Counters ............................................................................................................4-19 4.10.1 General/ Latched 16bit UP Counters ......................................................................4-20 4.10.2 General/ Latched 32bit Bi-directional Counters.......................................................4-21

4.11.1 Basic High Speed Counter Operation .....................................................................4-23 4.11.2 Availability of High Speed Counters .......................................................................4-24 4.11.3 1 Phase Counters - User Start and Reset (C235 - C240) .......................................4-26 4.11.4 1 Phase Counters - Assigned Start and Reset (C241 to C245) ..............................4-27 4.11.5 2 Phase Bi-directional Counters (C246 to C250) ....................................................4-28 4.11.6 A/B Phase Counters (C252 to C255) ......................................................................4-29 4.12 Data Registers...................................................................................................4-30 4.12.1 General Use Registers ............................................................................................ 4-31 4.12.2 Battery Backed/ Latched Registers .........................................................................4-32 4.12.3 Special Diagnostic Registers...................................................................................4-32 4.12.4 File Registers ..........................................................................................................4-33 4.12.5 Externally Adjusted Registers .................................................................................4-34 4.13 Index Registers.................................................................................................. 4-35 4.13.1 Modifying a Constant...............................................................................................4-36 4.13.2 Misuse of the Modifiers ...........................................................................................4-36 4.13.3 Using Multiple Index Registers................................................................................4-36 4.14 Bits, Words, BCD and Hexadecimal..................................................................4-37 4.14.1 Bit Devices, Individual and Grouped .......................................................................4-37 4.14.2 Word Devices ..........................................................................................................4-39 4.14.3 Interpreting Word Data ............................................................................................ 4-39 4.14.4 Two’s Compliment...................................................................................................4-42 4.15 Floating Point And Scientific Notation ...............................................................4-43 4.15.1 Scientific Notation....................................................................................................4-44 4.15.2 Floating Point Format ..............................................................................................4-45 4.15.3 Summary Of The Scientific Notation and Floating Point Numbers..........................4-46 5. Applied Instructions ...............................................................................5-1 5.1 Program Flow-Functions 00 to 09 ....................................................................... 5-4 5.1.1 CJ (FNC 00) ..............................................................................................................5-5 5.1.2 CALL (FNC 01)..........................................................................................................5-7 5.1.3 SRET (FNC 02) .........................................................................................................5-9 5.1.4 IRET, EI, DI(FNC 03, 04, 05) ..................................................................................5-10 5.1.5 FEND (FNC 06).......................................................................................................5-12 5.1.6 WDT (FNC 07) ........................................................................................................5-13 5.1.7 FOR, NEXT(FNC 08, 09) ........................................................................................5-14 5.2 Move And Compare - Functions 10 to 19..........................................................5-17 5.2.1 CMP (FNC 10)......................................................................................................... 5-18 5.2.2 ZCP (FNC 11) ......................................................................................................... 5-19 5.2.3 MOV (FNC 12) ........................................................................................................5-20 5.2.4 SMOV (FNC 13) ......................................................................................................5-21 5.2.5 CML (FNC 14) ......................................................................................................... 5-22 5.2.6 BMOV (FNC 15) .....................................................................................................5-23 5.2.7 FMOV (FNC 16) ......................................................................................................5-24 5.2.8 XCH (FNC 17) ......................................................................................................... 5-25 5.2.9 BCD (FNC18) ..........................................................................................................5-26 5.2.10 BIN (FNC 19)...........................................................................................................5-27

5.3.1 ADD (FNC 20) ......................................................................................................... 5-30 5.3.2 SUB (FNC 21) ........................................................................................................5-31 5.3.3 MUL (FNC 22) ......................................................................................................... 5-32 5.3.4 DIV (FNC 23)...........................................................................................................5-33 5.3.5 INC (FNC 24) ......................................................................................................... 5-34 5.3.6 DEC (FNC 24) ........................................................................................................5-35 5.3.7 WAND (FNC 26)......................................................................................................5-36 5.3.8 WOR (FNC 27)........................................................................................................5-37 5.3.9 WXOR (FNC 28) .....................................................................................................5-38 5.3.10 NEG (FNC 29) ........................................................................................................5-39 5.4 Rotation And Shift - Functions 30 to 39.............................................................5-42 5.4.1 ROR (FNC 30)......................................................................................................... 5-43 5.4.2 ROL (FNC 31) ......................................................................................................... 5-44 5.4.3 RCR (FNC 32)......................................................................................................... 5-45 5.4.4 RCL (FNC 33) ......................................................................................................... 5-46 5.4.5 SFTR (FNC 34) .......................................................................................................5-47 5.4.6 SFTL (FNC 35)........................................................................................................5-48 5.4.7 WSFR (FNC 36) ......................................................................................................5-49 5.4.8 WSFL (FNC 37).......................................................................................................5-50 5.4.9 SFWR (FNC 38) ......................................................................................................5-51 5.4.10 SFRD (FNC 39).......................................................................................................5-52 5.5 Data Operation - Functions 40 to 49 ................................................................. 5-54 5.5.1 ZRST (FNC 40) .......................................................................................................5-55 5.5.2 DECO (FNC 41) ......................................................................................................5-56 5.5.3 ENCO (FNC 42) ......................................................................................................5-57 5.5.4 SUM (FNC 43)......................................................................................................... 5-58 5.5.5 BON (FNC 44)......................................................................................................... 5-59 5.5.6 MEAN (FNC 45) ......................................................................................................5-60 5.5.7 ANS (FNC 46) ......................................................................................................... 5-61 5.5.8 ANR (FNC 47) ......................................................................................................... 5-62 5.5.9 SQR (FNC 48)......................................................................................................... 5-63 5.5.10 FLT (FNC 49) ..........................................................................................................5-64 5.6 High Speed Processing - Functions 50 to 59 ....................................................5-67 5.6.1 REF (FNC 50) ......................................................................................................... 5-68 5.6.2 REFF (FNC 51) .......................................................................................................5-69 5.6.3 MTR (FNC 52)......................................................................................................... 5-70 5.6.4 HSCS (FNC 53).......................................................................................................5-72 5.6.5 HSCR (FNC 54) ......................................................................................................5-74 5.6.6 HSZ (FNC 55) ......................................................................................................... 5-75 5.6.7 SPD (FNC 56) ......................................................................................................... 5-78 5.6.8 PLSY (FNC 57) .......................................................................................................5-79 5.6.9 PWM (FNC 58)........................................................................................................5-80 5.6.10 PLSR (FNC 59) .......................................................................................................5-81 5.7 Handy Instructions - Functions 60 to 69 ............................................................5-84 5.7.1 IST (FNC 60) ...........................................................................................................5-85 5.7.2 SER (FNC 61) ......................................................................................................... 5-87 5.7.3 ABSD (FNC 62).......................................................................................................5-88 5.7.4 INCD (FNC 63)........................................................................................................5-89 5.7.5 TTMR (FNC 64).......................................................................................................5-90 5.7.6 STMR (FNC 65) ......................................................................................................5-91 5.7.7 ALT (FNC 66) ..........................................................................................................5-92 5.7.8 RAMP (FNC 67) ......................................................................................................5-93 5.7.9 ROTC (FNC 68) ......................................................................................................5-95 5.7.10 SORT (FNC 69).......................................................................................................5-97

5.8.1 TKY (FNC 70)........................................................................................................ 5-101 5.8.2 HKY (FNC 71) ....................................................................................................... 5-102 5.8.3 DSW (FNC 72) ...................................................................................................... 5-104 5.8.4 SEGD (FNC 73) .................................................................................................... 5-106 5.8.5 SEGL (FNC 74) ..................................................................................................... 5-107 5.8.6 ARWS (FNC 75).................................................................................................... 5-109 5.8.7 ASC (FNC 76) ....................................................................................................... 5-110 5.8.8 PR (FNC 77).......................................................................................................... 5-111 5.8.9 FROM (FNC 78) .................................................................................................... 5-112 5.8.10 TO (FNC 79).......................................................................................................... 5-114 5.9 External FX Serial Devices - Functions 80 to 89 .............................................5-117 5.9.1 RS (FNC 80).......................................................................................................... 5-118 5.9.2 RUN (FNC 81)....................................................................................................... 5-119 5.9.3 ASCI (FNC 82) ...................................................................................................... 5-121 5.9.4 HEX (FNC 83) ....................................................................................................... 5-122 5.9.5 CCD (FNC 84)....................................................................................................... 5-123 5.9.6 VRRD (FNC 85) .................................................................................................... 5-124 5.9.7 VRSD (FNC 86)..................................................................................................... 5-125 5.9.8 PID (FNC 88)......................................................................................................... 5-126 5.10 Floating Point 1 & 2 - Functions 110 to 129 .................................................... 5-134 5.10.1 ECMP (FNC 110) .................................................................................................. 5-135 5.10.2 EZCP (FNC 111) ................................................................................................... 5-136 5.10.3 EBCD (FNC 118)................................................................................................... 5-137 5.10.4 EBIN (FNC 119) .................................................................................................... 5-138 5.10.5 EADD (FNC 120)................................................................................................... 5-139 5.10.6 EAUB (FNC 121)................................................................................................... 5-140 5.10.7 EMUL (FNC 122)................................................................................................... 5-141 5.10.8 EDIV (FNC 123) .................................................................................................... 5-142 5.10.9 ESQR (FNC 127) .................................................................................................. 5-143 5.10.10INT (FNC 129) ...................................................................................................... 5-144 5.11 Trigonometry - FNC 130 to FNC 139 ..............................................................5-146 5.11.1 SIN (FNC 130)....................................................................................................... 5-147 5.11.2 COS (FNC 131)..................................................................................................... 5-148 5.11.3 TAN (FNC 132) ..................................................................................................... 5-149 5.12 Data Operations 2 - FNC 140 to FNC 149 ...................................................... 5-151 5.12.1 SWAP (FNC 147) .................................................................................................. 5-152 5.13 Positioning Control - FNC 150 to FNC 159 .....................................................5-155 5.13.1 Cautions when using Positioning Instructions ....................................................... 5-156 5.13.2 Pulse train settings ................................................................................................ 5-157 5.13.3 Devices related to positioning ............................................................................... 5-158 5.13.4 Servo Wiring Example........................................................................................... 5-159 5.13.5 Example Program.................................................................................................. 5-160 5.13.6 ABS (FNC 155) ..................................................................................................... 5-164 5.13.7 ZRN (FNC 156) ..................................................................................................... 5-165 5.13.8 PLSV(FNC157) ..................................................................................................... 5-167 5.13.9 DRVI (FNC 158) .................................................................................................... 5-168 5.13.10DRVA(FNC 159)................................................................................................... 5-170 5.14 Real Time Clock Control - FNC 160 to FNC 169.............................................5-174 5.14.1 TCMP (FNC 160) .................................................................................................. 5-175 5.14.2 TZCP (FNC 161) ................................................................................................... 5-176 5.14.3 TADD (FNC 162)................................................................................................... 5-177 5.14.4 TSUB (FNC 163) ................................................................................................... 5-178 5.14.5 TRD (FNC 166) ..................................................................................................... 5-179 5.14.6 TWR (FNC 167) .................................................................................................... 5-180 5.14.7 Hour (FNC 169)..................................................................................................... 5-181

5.15.1 GRY (FNC 170)..................................................................................................... 5-185 5.15.2 GBIN (FNC 171).................................................................................................... 5-185 5.15.3 RD3A (FNC 176) ................................................................................................... 5-187 5.15.4 WR3A (FNC 177) .................................................................................................. 5-188 5.16 Additional Functions - FNC 180 to FNC 189 ...................................................5-190 5.16.1 EXTR (FNC 180) ................................................................................................... 5-191 5.17 Inline Comparisons - FNC 220 to FNC 249.....................................................5-217 5.17.1 LD compare (FNC 224 to 230) .............................................................................. 5-218 5.17.2 AND compare (FNC 232 to 238) ........................................................................... 5-219 5.17.3 OR compare (FNC 240 to 246) ............................................................................. 5-220 6. Diagnostic Devices................................................................................6-1 6.1 Device Lists ......................................................................................................... 6-2 6.2 PLC Status (M8000 to M8009 and D8000 to D8009).......................................... 6-7 6.3 Clock Devices (M8010 to M8019 and D8010 to D8019) .................................... 6-8 6.4 Operation Flags (M8020 to M8029 and D8020 to D8029) .................................. 6-9 6.5 PLC Operation Mode (M8030 to M8039 and D8030 to D8039) ....................... 6-10 6.6 Step Ladder (STL) Flags (M8040 to M8049 and D8040 to D8049) ..................6-11 6.7 Interrupt Control Flags (M8050 to M8059 and D8050 to D8059) ....................6-12 6.8 Error Detection Devices (M8060 to M8069 and D8060 to D6069) ...................6-13 6.9 Link and Special Operation Devices (M8070 to M8099 and D8070 to D8099) 6-15 6.10 Miscellaneous Devices (M8100 to M8119 and D8100 to D8119) .....................6-16 6.11 Communication Adapter Devices, i.e. 232ADP, 485ADP (M8120 to M8129 and D8120 to D8129) ............................................................6-16 6.12 High Speed Zone Compare Table Comparison Flags (M8130 to M8148 and D8130 to D8148) .......................................................... 6-17 6.13 Miscellaneous Devices (M8160 to M8199) .......................................................6-19 6.14 Miscellaneous devices (D8158 to D8164) and Index Registers (D8182 to D8199) .....................................................................6-20 6.15 N:N Network Related Flags and Data Registers ...............................................6-21 6.16 Up/Down Counter Control (M8200 to M8234 and D8219 to D8234) ...............6-22 6.17 High Speed Counter Control (M8235 to M8255 and D8235 to D8255) ............ 6-22 6.18 Error Code Tables .............................................................................................6-23 7. Execution Times And Instructional Hierarchy7-1 7.1 Basic Instructions ................................................................................................ 7-1 7.2 Applied Instructions ............................................................................................ 7-3 7.3 Hierarchical RelationshipsOf Basic Program Instructions .................................7-11 7.4 Batch Processing...............................................................................................7-13 7.5 Summary of Device Memory Allocations...........................................................7-13 7.6 Limits Of Instruction Usage ...............................................................................7-15 7.6.1 Instructions Which Can Only Be Used Once In The Main Program Area ...............7-15 7.6.2 Instructions Which Are Not Suitable For Use With 110V AC Input Units7-15 8. PLC Device Tables................................................................................8-1 8.1 Performance Specification Of The FX1S ............................................................ 8-1 8.2 Performance Specification Of The FX1N ............................................................ 8-2 8.3 Performance Specification Of The FX2N and the FX2NC PLC’s ........................ 8-4

9.1 Addressing Extension Modules ........................................................................... 9-1 9.2 Real Time Clock Function ................................................................................... 9-2 9.2.1 Setting the real time clock .........................................................................................9-2 9.3 Analog Expansion Boards ................................................................................... 9-4 9.3.1 FX1N-1DA-BD........................................................................................................... 9-4 9.3.2 FX1N-2AD-BD......................................................................................................... 9-11 10.Points Of Technique...........................................................................10-1 10.1 Advanced Programming Points .........................................................................10-1 10.2 Users of DC Powered FX2N Units ....................................................................10-1 10.3 Using The Forced RUN/STOP Flags................................................................. 10-2 10.3.1 A RUN/STOP push button configuration .................................................................10-2 10.3.2 Remote RUN/STOP control ....................................................................................10-3 10.4 Constant Scan Mode .........................................................................................10-4 10.5 Alternating ON/OFF States................................................................................10-4 10.6 Using Battery Backed Devices For Maximum Advantage .................................10-5 10.7 Indexing Through MultipleDisplay Data Values.................................................10-5 10.8 Reading And Manipulating Thumbwheel Data ..................................................10-6 10.9 Measuring a High Speed Pulse Input ................................................................10-6 10.9.1 A 1 msec timer pulse measurement........................................................................ 10-6 10.9.2 A 0.1 msec timer pulse measurement.....................................................................10-7 10.10Using The Execution Complete Flag, M8029 ...................................................10-7 10.11Creating a User Defined MTR Instruction .........................................................10-8 10.12An Example SystemApplication Using STL And IST Program Control.............10-8 10.13Using The PWM Instruction For Motor Control ...............................................10-15 10.14Communication Format................................................................................... 10-18 10.14.1Specification of the communication parameters:.................................................. 10-18 10.14.2Header and Terminator Characters...................................................................... 10-19 10.14.3Timing diagrams for communications:.................................................................. 10-20 10.14.48 bit or 16 bit communications.............................................................................. 10-23 10.15PID Programming Techniques........................................................................10-24 10.15.1Keeping MV within a set range............................................................................. 10-24 10.15.2Manual/Automatic change over ............................................................................ 10-24 10.15.3Using the PID alarm signals ................................................................................. 10-25 10.15.4Other tips for PID programming............................................................................ 10-25 10.16Additional PID functions..................................................................................10-26 10.16.1Output Value range control (S3+1 b5).................................................................. 10-26 10.17Pre-tuning operation .......................................................................................10-27 10.17.1Variable Constants ............................................................................................... 10-27 10.18Example Autotuning Program .........................................................................10-28 10.19Using the FX1N-5DM Display module. ...........................................................10-29 10.19.1Outline of functions............................................................................................... 10-29 10.19.2Control devices for 5DM ....................................................................................... 10-30 10.19.3Display screen protect function............................................................................. 10-30 10.19.4Specified device monitor....................................................................................... 10-31 10.19.5Specified device edit............................................................................................. 10-32 10.19.6Automatic Backlight OFF...................................................................................... 10-33 10.19.7Error display enable / disable ............................................................................... 10-33 11. Index..................................................................................................11-1 11.1 Index..................................................................................................................11-1 11.2 ASCII Character Codes ..................................................................................... 11-9 11.3 Applied Instruction List ....................................................................................11-10

3 STL Programming 4 Devices in Detail 5 Applied Instructions 6 Diagnostic Devices 7 Instruction Execution Times 8 PLC Device Tables 9 Assigning System Devices 10 Points of Technique 11 Index FX Series Programmable Controllers Introduction 1

Introduction 1 Chapter Contents 1. Introduction............................................................................................1-1 1.1 Overview.............................................................................................................. 1-1 1.2 What is a ProgrammableController? ................................................................... 1-2 1.3 What do You Need to Program a PC? ................................................................ 1-2 1.4 Curent Generation CPU’s, All versions ............................................................... 1-3 1.5 Associated Manuals ............................................................................................ 1-4

This manual gives details on all aspects of operation and programming for FX1S, FX1N, FX2N and FX2NC programmable controllers (PLCs). For all information relating to the PLC hardware and installation, refer to the appropriate manual supplied with the unit. 2) How to use this manual This manual covers all the functions of the highest specification Programmable (Logic) Controller (PLC). For this reason, the following indicator is included in relevant section titles to show which PLCs that section applies to; Shaded boxes indicate the applicable PLC type - “FX1S” - All FX1S PLCs - “FX1N” - All FX1N PLCs - “FX2N” - All FX2N PLCs - “FX2NC” - All FX2NC PLCs If an indicator box is half shaded, as shown to the left, this means that not all the functions described in the current section apply to that PLC. The text explains in further detail or makes an independent reference. If there are no indicator boxes then assume the section applies to all PLC types unless otherwise stated. 3) FX family This is a generic term which is often used to describe all Programmable Controllers without identifying individual types or model names. 4) CPU version numbers and programming support As Mitsubishi upgrades each model different versions have different capabilities. - Please refer to section 1.4 for details about peripheral support for each model. FX1S FX1N FX2N FX2NC FX1S FX1N FX2N FX2NC FX1S FX1N FX2N FX2NC

A Programmable Logic Controller (PLC or programmable controller) is a device that a user can program to perform a series or sequence of events. These events are triggered by stimuli (usually called inputs) received at the PLC or through delayed actions such as time delays or counted occurrences. Once an event triggers, it actuates in the outside world by switching ON or OFF electronic control gear or the physical actuation of devices. A programmable controller will continually ‘loop’ through its internal ‘user defined’ program waiting for inputs and giving outputs at the programmed specific times. Note on terminology: The term programmable controller is a generic word used to bring all the elements making the control system under one descriptive name. Sometimes engineers use the term ‘Programmable Logic Controller’, ‘PLC’ or ‘programmable controller’ to describe the same control system. The construction of a programmable controller can be broken down into component parts. The element where the program is loaded, stored and processed is often known as the Main Processing Unit or MPU. Other terms commonly heard to describe this device are ‘base unit’, ‘controller’ and ‘CPU’. The term CPU is a little misleading as todays more advanced products may contain local CPU devices. A Main CPU (or more correctly a Main Processing Unit) controls these local CPUs through a communication network or bus. 1.3 What do You Need to Program a PLC? A variety of tools are available to program the Mitsubishi FX family of PLCs. Each of these tools can use and access the instructions and devices listed in this manual for the identified PLC. FX1S FX1N FX2N FX2NC FX1S FX1N FX2N FX2NC HPP FX-10P-E FX-20P-E Personal computer Melsec MEDOC Melsec Medoc Plus SW1PC-FXGPEE FX-PCS-WIN-E FX1S FX FX2N FX1N 2NC Opto-isolated RS422 interface RS232/

1.4.1 Current Generation CPU all versions Peripherals Table Description Model Number System software version with full support Hand held programmer (HHP) FX-10P-E from V 3.00 HHP cassette FX-20P-MFXA-E from V 3.00 Data access units/ GOT units FX-10DU-E from V 4.00 FX-20DU-E Supports up to FX devices only FX-25DU-E from V 2.00 FX-30DU-E from V 3.00 FX-40DU-E(S) Supports up to FX devices only FX-40DU-TK-ES from V 3.00 FX-50DU-TK(S)-E from V 2.10 F930GOT-BWD All versions F94*GOT-SWD(LWD)-E All versions F94*GOT Handy All versions F940WGOT All versions FX1S FX1N FX2N FX2NC The introduction of the current CPU provides the FX user with many new devices and instructions. To use the full features of the current range of FX units the user must upgrade older software and hardware programming tools. However, because of the downward compatibility of the current range, it is not necessary to upgrade existing programming tools up to the equivalent functionality of last generation FX CPU ver 3.30 units.

FX1S Hardware manual JY992D83901 FX1N Hardware manual JY992D88201 FX2N Hardware manual JY992D66301 FX2NC Hardware manual JY992D76401 FX Programming FX0, FX0S, FX0N, FX, FX2C, FX2N, FX2NC Programming manual JY992D48301 FX1S, FX1N, FX2N, FX2NC Programming manual II JY992D88101 FX Peripherals FX-10P-E Operation manual JY992D33401 FX-20P-E Operation manual JY992D19101 FX-10P, 20P-E Supplementary manual JY992D66901 FX-PCS-WIN-E Software manual JY992D66501 FX Special Function Blocks FX0N-3A Users guide JY992D49001 FX-4AD Users guide JY992D52601 FX-2AD-PT Users guide JY992D55701 FX-4AD-TC Users guide JY992D55901 FX-2DA Users guide JY992D52801 FX2N-2AD Users manual JY992D74701 FX-4DA Users guide JY992D61001 FX2N-4AD Users guide JY992D65201 FX2N-4AD-TC Users guide JY992D65501 FX2N-4AD-PT Users guide JY992D65601 FX2N-4DA Users guide JY992D65901 FX2N-2DA Users manual JY992D74901 FX2N-2LC Users guide JY992D85601 FX2N-2LC Users manual JY992D85801 FX-485PC-IF Hardware manual JY992D81801 FX/FX0N-485ADP Users guide JY992D53201 FX-232ADP Users guide JY992D48801 FX0N-232ADP Users guide JY992D51301 FX2N-232BD Users guide JY992D66001 FX2N-422BD Users guide JY992D66101 FX2N-485BD Hardware manual JY992D73401 FX2N-232IF Hardware manual JY992D73501 FX Communication Users manual JY992D69901 FX2N-CCL Users manual JY992D71801 FX2N-16LNK-M Users manual JY992D73701 FX0N-32NT-DP Users manual JY992D61401 FX2N-32DP-IF Hardware manual JY992D77101 FX2N-32DP-IF Users manual JY992D79401 FX2N-32ASI-M Users manual JY992D76901

FX-5DM Users manual JY992D84901 FX-10DM Users manual JY992D86401 FX Positioning FX-1HC Users guide JY992D53001 FX2N/FX-1PG-E Users manual JY992D65301 E-20P-E Operation manual JY992D44901 FX2N-1HC Users guide JY992D65401 FX2N-1RM-E-SET Users manual JY992D71101 FX2N-10GM Users guide JY992D77701 FX2N-20GM Users guide JY992D77601 FX2N-10/20GM Hardware/Programming manual JY992D77801 FX-PCS-VPS/WIN-E Software manual JY992D86801 Manual name Number

3 STL Programming 4 Devices in Detail 5 Applied Instructions 6 Diagnostic Devices 7 Instruction Execution Times 8 PLC Device Tables 9 Assigning System Devices 10 Points of Technique 11 Index FX Series Programmable Controllers Basic Program Instructions 2

Basic Program Instructions 2 Chapter Contents 2. Basic Program Instructions ...................................................................2-1 2.1 What is a Program?............................................................................................. 2-1 2.2 Outline of Basic Devices Used in Programming.................................................. 2-1 2.3 How to Read Ladder Logic .................................................................................. 2-2 2.4 Load, Load Inverse.............................................................................................. 2-3 2.5 Out....................................................................................................................... 2-4 2.5.1 Timer and Counter Variations ...................................................................................2-4 2.5.2 Double Coil Designation............................................................................................2-5 2.6 And, And Inverse ................................................................................................. 2-6 2.7 Or, Or Inverse...................................................................................................... 2-7 2.8 Load Pulse, Load Trailing Pulse.......................................................................... 2-8 2.9 And Pulse, And Trailing Pulse ............................................................................. 2-9 2.10 Or Pulse, Or Trailing Pulse................................................................................2-10 2.11 Or Block............................................................................................................. 2-11 2.12 And Block ..........................................................................................................2-12 2.13 MPS, MRD and MPP.........................................................................................2-13 2.14 Master Control and Reset..................................................................................2-15 2.15 Set and Reset....................................................................................................2-17 2.16 Timer, Counter(Out & Reset).............................................................................2-18 2.16.1 Basic Timers, Retentive Timers And Counters........................................................2-18 2.16.2 Normal 32 bit Counters ...........................................................................................2-19 2.16.3 High Speed Counters ..............................................................................................2-19 2.17 Leading and Trailing Pulse ................................................................................2-20 2.18 Inverse...............................................................................................................2-21 2.19 No Operation .....................................................................................................2-22 2.20 End ....................................................................................................................2-23

2-1 2. Basic Program Instructions 2.1 What is a Program? A program is a connected series of instructions written in a language that the PLC can understand. There are three forms of program format; instruction, ladder and SFC/STL. Not all programming tools can work in all programming forms. Generally hand held programming panels only work with instruction format while most graphic programming tools will work with both instruction and ladder format. Specialist programming software will also allow SFC style programming. 2.2 Outline of Basic Devices Used in Programming There are six basic programming devices. Each device has its own unique use. To enable quick and easy identification each device is assigned a single reference letter; - X: This is used to identify all direct, physical inputs to the PLC. - Y: This is used to identify all direct, physical outputs from the PLC. - T: This is used to identify a timing device which is contained within the PLC. - C: This is used to identify a counting device which is contained within the PLC. - M and S: These are used as internal operation flags within the PLC. All of the devices mentioned above are known as ‘bit devices’. This is a descriptive title telling the user that these devices only have two states; ON or OFF, 1 or 0. LD OUT AND SET LD OUT X10 Y7 M38 S5 X21 T01 K40 Instruction format Ladder Format SFC Format Detailed device information: • Chapter 4 contains this information in detail. However, the above is all that is required for the rest of this chapter. FX Series Programmable Controllers

Basic Program Instructions 2 2-2 2.3 How to Read Ladder Logic Ladder logic is very closely associated to basic relay logic. There are both contacts and coils that can be loaded and driven in different configurations. However, the basic principle remains the same. A coil drives direct outputs of the PLC (ex. a Y device) or drives internal timers, counters or flags (ex. T, C, M and S devices). Each coil has associated contacts. These contacts are available in both “normally open” (NO) and “normally closed” (NC) configurations. The term “normal(ly)” refers to the status of the contacts when the coil is not energized. Using a relay analogy, when the coil is OFF, a NO contact would have no current flow, that is, a load being supplied through a NO contact would not operate. However, a NC contact would allow current to flow, hence the connected load would be active. Activating the coil reverses the contact status, that is, the current would flow in a NO contact and a NC contact would inhibit the flow. Physical inputs to the PLC (X devices) have no programmable coil. These devices may only be used in a contact format (NO and NC types are available). Example: Because of the close relay association, ladder logic programs can be read as current flowing from the left vertical line to the right vertical line. This current must pass through a series of contact representations such as X0 and X1 in order to switch the output coil Y0 ON. Therefore, in the example shown, switching X0 ON causes the output Y0 to also switch ON. If however, the limit switch X1 is activates, the output Y0 turns OFF. This is because the connection between the left and the right vertical lines breaks so there is no current flow. X0 X1 Y0 PC Program I N P U T O U T P U T Programmable Controller DC Power Supply X0 X1 Y0 AC Power Supply COM (Y0) Toggle switch Limit switch Motor

Basic Program Instructions 2 2-3 2.4 Load, Load Inverse Program example: Basic points to remember: - Connect the LD and LDI instructions directly to the left hand bus bar. - Or use LD and LDI instructions to define a new block of program when using the ORB and ANB instructions (see later sections). Mnemonic Function Format Devices Program steps LD (LoaD) Initial logical operation contact type NO (normally open) X, Y, M, S, T, C 1 LDI (LoaD Inverse) Initial logical operation contact type NC (normally closed) X, Y, M, S, T, C 1 FX1S FX1N FX2N FX2NC X0 Y0 X1 M100 T0 T0 Y1 K19 LDI K X Y X M T K T Y LD OUT LDI OUT OUT SP LD OUT 0 1 2 3 4 7 8 0 0 1 100 0 19 0 1 When using hand held programmers, the space key needs to be pressed to enable the constant to be entered. The OUT instruction: • For details of the OUT instruction (including basic timer and counter variations) please see over the following page.

Basic Program Instructions 2 2-4 2.5 Out Basic points to remember: - Connect the OUT instruction directly to the right hand bus bar. - It is not possible to use the OUT instruction to drive ‘X’ type input devices. - It is possible to connect multiple OUT instructions in parallel (for example see the previous page; M100/T0 configuration) 2.5.1 Timer and Counter Variations When configuring the OUT instruction for use as either a timer (T) or counter (C) a constant must also be entered. The constant is identified by the letter “K” (for example see previous page; T0 K19). In the case of a timer, the constant “K” holds the duration data for the timer to operate, i.e. if a 100 msec timer has a constant of “K100” it will be (1005 100 msec) 10 seconds before the timer coil activates. With counters, the constant identifies how many times the counter must be pulsed or triggered before the counter coil activates. For example, a counter with a constant of “8” must be triggered 8 times before the counter coil finally energizes. The following table identifies some basic parameter data for various timers and counters; Mnemonic Function Format Devices Program steps OUT (OUT) Final logical operation type coil drive Y, M, S, T, C Y, M:1 S, special M coils: 2 T:3 C (16 bit): 3 C (32 bit): 5 Timer/Counter Setting constant K Actual setting Program steps 1 msec Timer 1 to 32,767 0.001 to 32.767 sec 3 10 msec Timer 0.01 to 327.67 sec 100 msec Timer 0.1 to 3276.7 sec 16 bit Counter 1 to 32,767 1 to 32,767 32 bit Counter -2,147,483,648 to 2,147,483,647 -2,147,483,648 to 2,147,483,647 5 FX1S FX1N FX2N FX2NC

Basic Program Instructions 2 2-5 2.5.2 Double Coil Designation Double or dual coiling is not a recommended practice. Using multiple output coils of the same device can cause the program operation to become unreliable. The example program shown opposite identifies a double coil situation; there are two Y3 outputs. The following sequence of events will occur when inputs X1 = ON and X2 = OFF; 1.The first Y3 tuns ON because X1 is ON. The contacts associated with Y3 also energize when the coil of output Y3 energizes. Hence, output Y4 turns ON. 2.The last and most important line in this program looks at the status of input X2. If this is NOT ON then the second Y3 coil does NOT activate. Therefore the status of the Y3 coil updates to reflect this new situation, i.e. it turns OFF. The final outputs are then Y3 = OFF and Y4 = ON. Input durations: The ON or OFF duration of the PLC inputs must be longer than the operation cycle time of the PLC. Taking a 10 msec (standard input filter) response delay into account, the ON/OFF duration must be longer than 20 msec if the operation cycle (scan time) is 10 msec. Therefore, in this example, input pulses of more than 25Hz (1sec/(20msec ON + 20msec OFF)) cannot be sensed. There are applied instructions provided to handle such high speed input requests. �: Input ON state NOT recognized �: Input ON state recognized �: Input OFF state NOT recognized �: 1 program processing �: Input processing �: Output processing �: A full program scan/operation cycle X1 Y3 X2 1. 2. Y3 Y3 Y4 Use of dual coils: • Always check programs for incidents of dual coiling. If there are dual coils the program will not operate as expected - possibly resulting in physical damage. The last coil effect: • In a dual coil designation, the coil operation designated last is the effective coil. That is, it is the status of the previous coil that dictates the behavior at the current point in the program. 1 2 3 5 6 4 4 7 t secs

Basic Program Instructions 2 2-6 2.6 And, And Inverse Program example: Basic points to remember: - Use the AND and ANI instructions for serial connection of contacts. As many contacts as required can be connected in series (see following point headed “Peripheral limitations”). - The output processing to a coil, through a contact, after writing the initial OUT instruction is called a “follow-on” output (for an example see the program above; OUT Y4). Follow- on outputs are permitted repeatedly as long as the output order is correct. Mnemonic Function Format Devices Program steps AND (AND) Serial connection of NO (normally open) contacts X, Y, M, S, T, C 1 ANI (AND Inverse) Serial connection of NC (normally closed) contacts X, Y, M, S, T, C 1 FX1S FX1N FX2N FX2NC X X Y Y X M T Y X2 Y3 AND X0 X3 T1 ANI AND 2 0 3 3 3 101 1 4 LD AND OUT LD ANI OUT OUT AND 0 1 2 3 4 6 7 5 Y3 M101 Y4 Peripheral limitations: • The PLC has no limit to the number of contacts connected in series or in parallel. However, some programming panels, screens and printers will not be able to display or print the program if it exceeds the limit of the hardware. It is preferable for each line or rung of ladder program to contain up to a maximum of 10 contacts and 1 coil. Also, keep the number of follow-on outputs to a maximum of 24.

Basic Program Instructions 2 2-7 2.7 Or, Or Inverse Program example: Basic points to remember: - Use the OR and ORI instructions for parallel connection of contacts. To connect a block that contains more than one contact connected in series to another circuit block in parallel, use an ORB instruction. - Connect one side of the OR/ORI instruction to the left hand bus bar. Mnemonic Function Format Devices Program steps OR (OR) Parallel connection of NO (normally open) contacts X, Y, M, S, T, C 1 ORI (OR Inverse) Parallel connection of NC (normally closed) contacts X, Y, M, S, T, C 1 FX1S FX1N FX2N FX2NC X4 X6 M102 Y5 X7 X10 M103 M110 OR ORI LD OR ORI OUT LDI ANI AND OR 0 1 2 3 4 6 7 5 8 9 OR OUT X X M Y Y X M X M M 4 6 102 5 5 103 10 7 110 103 Y5 M103 Peripheral limitations: • The PLC has no limit to the number of contacts connected in series or in parallel. However, some programming panels, screens and printers will not be able to display or print the program if it exceeds the limit of the hardware. It is preferable for each line or rung of ladder program to contain up to a maximum of 10 contacts and 1 coil. Also keep number of follow-on outputs to a maximum of 24.

Basic Program Instructions 2 2-8 2.8 Load Pulse, Load Trailing Pulse Program example: Basic points to remember: - Connect the LDP and LDF instructions directly to the left hand bus bar. - Or use LDP and LDF instructions to define a new block of program when using the ORB and ANB instructions (see later sections). - LDP is active for one program scan after the associated device switches from OFF to ON. - LDF is active for one program scan after the associated device switches from ON to OFF. Mnemonic Function Format Devices Program steps LDP (LoaDPulse) Initial logical operation - Rising edge pulse X, Y, M, S, T, C 2 LDF (LoaD Falling pulse) Initial logical operation Falling / trailing edge pulse X, Y, M, S, T, C 2 FX1S FX1N FX2N FX2NC LDF LDP X0 Y0 M100 X1 X0 0 LDP X 0 2 OR X 1 3 OUT M 100 4 LDF X 0 6 OUT Y 0 Single Operation flags M2800 to M3071: • The pulse operation instructions, when used with auxiliary relays M2800 to M3071, only activate the first instruction encountered in the program scan, after the point in the program where the device changes. Any other pulse operation instructions will remain inactive. • This is useful for use in STL programs (see chapter 3) to perform single step operation using a single device. • Any other instructions (LD, AND, OR, etc.) will operate as expected. For more details please see page 4-5.

Basic Program Instructions 2 2-9 2.9 And Pulse, And Trailing Pulse Program example: Basic points to remember: - Use the ANDP and ANDF instructions for the serial connection of pulse contacts. - Usage is the same as for AND and ANI; see earlier. - ANP is active for one program scan after the associated device switches from OFF to ON. - ANF is active for one program scan after the associated device switches from ON to OFF. Mnemonic Function Format Devices Program steps ANP (ANd Pulse) Serial connection of Rising edge pulse X, Y, M, S, T, C 2 ANF (ANd Falling pulse) Serial connection of Falling / trailing edge pulse X, Y, M, S, T, C 2 FX1S FX1N FX2N FX2NC ANP T10 �� ���� X1 X0 0 LD M 40 1 OR X 1 2 ANP T 10 4 OUT M 100 5 LDF X 0 6 ANF C 0 8 OUT Y 4 M40 ANF C0 Single operation flags M2800 to M3071: • When used with flags M2800 to M3071 only the first instruction will activate. For details see page 2-8

Basic Program Instructions 2 2-10 2.10 Or Pulse, Or Trailing Pulse Program example: Basic points to remember: - Use the ORP and ORF instructions for the parallel connection of pulse contacts. - Usage is the same as for OR and ORI; see earlier. - ORP is active for one program scan after the associated device switches from OFF to ON. - ORF is active for one program scan after the associated device switches from ON to OFF. Mnemonic Function Format Devices Program steps ORP (OR Pulse) Parallel connection of Rising edge pulse X, Y, M, S, T, C 2 ORF (OR Falling pulse) Parallel connection of Falling / trailing edge pulse X, Y, M, S, T, C 2 FX1S FX1N FX2N FX2NC ��� �� �� �� � �� � �� � ��� � � � ��� � �� � �� � � � ��� � �� � �� � � � ��� � � � ��� �� ��� � � ��� ��� ��� ������� �� �� Single operation flags M2800 to M3071: • When used with flags M2800 to M3071 only the first instruction will activate. For details see page 2-8

Basic Program Instructions 2 2-11 2.11 Or Block Program example: Basic points to remember: - An ORB instruction is an independent instruction and is not associated with any device number. - Use the ORB instruction to connect multi-contact circuits (usually serial circuit blocks) to the preceding circuit in parallel. Serial circuit blocks are those in which more than one contact connects in series or the ANB instruction is used. - To declare the starting point of the circuit block use a LD or LDI instruction. After completing the serial circuit block, connect it to the preceding block in parallel using the ORB instruction. Mnemonic Function Format Devices Program steps ORB (OR Block) Parallel connection of multiple contact circuits N/A 1 FX1S FX1N FX2N FX2NC X0 X1 X2 X3 ORB X4 X5 ORB LD AND LD AND ORB ORB LDI AND 0 1 2 3 4 6 7 5 8 OUT X X X X X 0 1 2 3 4 Y X 5 6 LD AND LD AND LDI ORB AND ORB 0 1 2 3 4 6 7 5 8 OUT X X X X X 0 1 2 3 5 Y 6 X 4 Recommended sequential programming method Non-preferred batch programming method Y6 Batch processing limitations: • When using ORB instructions in a batch, use no more than 8 LD and LDI instructions in the definition of the program blocks (to be connected in parallel). Ignoring this will result in a program error (see the right most program listing). Sequential processing limitations: • There are no limitations to the number of parallel circuits when using an ORB instruction in the sequential processing configuration (see the left most program listing).

Basic Program Instructions 2 2-12 2.12 And Block Program example: Basic points to remember: - An ANB instruction is an independent instruction and is not associated with any device number - Use the ANB instruction to connect multi-contact circuits (usually parallel circuit blocks) to the preceding circuit in series. Parallel circuit blocks are those in which more than one contact connects in parallel or the ORB instruction is used. - To declare the starting point of the circuit block, use a LD or LDI instruction. After completing the parallel circuit block, connect it to the preceding block in series using the ANB instruction. Mnemonic Function Format Devices Program steps ANB (ANd Block) Serial connection of multiple parallel circuits N/A 1 FX1S FX1N FX2N FX2NC X0 X1 X3 X2 X3 X4 X5 X6 ANB LD ORB LD OR LD AND LDI OR AND ORB 0 1 2 3 4 6 7 5 8 ANB X X X X X X X 0 1 2 3 4 6 5 9 10 OR OUT X Y 3 7 Recommended sequential programming method Y7 Batch processing limitations: • When using ANB instructions in a batch, use no more than 8 LD and LDI instructions in the definition of the program blocks (to be connected in parallel). Ignoring this will result in a program error (see ORB explanation for example). Sequential processing limitations: • It is possible to use as many ANB instructions as necessary to connect a number of parallel circuit blocks to the preceding block in series (see the program listing).

Basic Program Instructions 2 2-13 2.13 MPS, MRD and MPP Basic points to remember: - Use these instructions to connect output coils to the left hand side of a contact. Without these instructions connections can only be made to the right hand side of the last contact. - MPS stores the connection point of the ladder circuit so that further coil branches can recall the value later. - MRD recalls or reads the previously stored connection point data and forces the next contact to connect to it. - MPP pops (recalls and removes) the stored connection point. First, it connects the next contact, then it removes the point from the temporary storage area. - For every MPS instruction there MUST be a corresponding MPP instruction. - The last contact or coil circuit must connect to an MPP instruction. - At any programming step, the number of active MPS-MPP pairs must be no greater than 11. Mnemonic Function Format Devices Program steps MPS (Point Store) Stores the current result of the internal PLC operations N/A 1 MRD (Read) Reads the current result of the internal PLC operations N/A 1 MPP (PoP) Pops (recalls and removes) the currently stored result N/A 1 FX1S FX1N FX2N FX2NC MPS MRD MPP MPS, MRD and MPP usage: • When writing a program in ladder format, programming tools automatically add all MPS, MRD and MPP instructions at the program conversion stage. If the generated instruction program is viewed, the MPS, MRD and MPP instructions are present. • When writing a program in instruction format, it is entirely down to the user to enter all relevant MPS, MRD and MPP instructions as required.

Basic Program Instructions 2 2-14 Multiple program examples: X0 X1 X2 X4 X6 X7 X3 X5 X10 X11 MPS MRD MPP X0 X1 X3 X2 X4 X5 X6 MPS MPP MPP MPS X0 X1 X2 X3 X4 MPP MPS MPS MPP 1 7 10 3 2 11 Y X X Y Y X ANB OUT MPP AND OUT ANB LD OR OUT 12 13 14 15 16 18 19 17 20 0 1 2 3 4 6 7 5 8 9 10 11 LD MPS LD OR ANB LD OUT MRD AND LD AND ORB X X X Y X X X X 0 1 2 0 4 3 5 6 0 1 2 3 4 6 7 5 8 LD MPS AND MPS AND AND OUT MPP OUT X X Y Y X X 0 1 0 1 3 2 9 10 11 12 13 14 15 16 MPP AND MPS AND OUT MPP AND OUT X X Y X Y 4 5 2 6 3 LD MPS AND MPS AND MPS MPS AND AND 0 1 2 3 4 6 7 5 8 X X X X X 0 1 2 3 4 9 10 11 12 13 14 15 16 OUT MPP OUT MPP OUT MPP OUT MPP 17 OUT Y Y Y Y Y 0 1 2 3 4 Y0 Y1 Y2 Y3 Y0 Y1 Y2 Y3 Y0 Y1 Y2 Y3 Y4

Basic Program Instructions 2 2-15 2.14 Master Control and Reset Program example: Basic points to remember: - After the execution of an MC instruction, the bus line (LD, LDI point) shifts to a point after the MC instruction. An MCR instruction returns this to the original bus line. - The MC instruction also includes a nest level pointer N. Nest levels are from the range N0 to N7 (8 points). The top nest level is ‘0’ and the deepest is ‘7’. - The MCR instruction resets each nest level. When a nest level is reset, it also resets ALL deeper nest levels. For example, MCR N5 resets nest levels 5 to 7. - When input X0=ON, all instructions between the MC and the MCR instruction execute. - When input X0=OFF, none of the instruction between the MC and MCR instruction execute; this resets all devices except for retentive timers, counters and devices driven by SET/RST instructions. - The MC instruction can be used as many times as necessary, by changing the device number Y and M. Using the same device number twice is processed as a double coil (see section 2.5.2). Nest levels can be duplicated but when the nest level resets, ALL occurrences of that level reset and not just the one specified in the local MC. Mnemonic Function Format Devices Program steps MC (Master Control) Denotes the start of a master control block Y, M (no special M coils allowed) N denotes the nest level (N0 to N7) 3 MCR (Master Control Reset) Denotes the end of a master control block N denotes the nest level (N0 to N7) to be reset. 2 FX1S FX1N FX2N FX2NC MC N MCR N X0 X1 M100 N0 MC X2 N0 MCR M100 N0 X N M X Y X Y N 0 0 100 1 0 2 1 0 LD MC SP LD OUT MCR LD OUT 0 1 4 5 7 8 6 Note: SP - space key N - nest level of MC (N0 to N7) Y1 Y0

Basic Program Instructions 2 2-16 Nested MC program example: Level N0: Bus line (B) active when X0 is ON. Level N1: Bus line (C) active when both X0 and X2 are ON. Level N2: Bus line (D) active when X0,X2 and X4 are ON. Level N1: MCRN2 executes and restores bus line (C). If the MCR had reset N0 then the original bus bar (A) would now be active as all master controls below nest level 0 would reset. Level N0: MCRN1 executes and restores bus line (B). Initial state: MCR N0 executes and restores the initial bus line (A). Output Y5 turns ON/OFF according to the ON/OFF state of X10, regardless of the ON/OFF status of inputs X0, X2 or X4. X0 X1 M100 N0 MC MCR M100 N0 X2 X3 M101 N1 MC M101 N1 X4 X5 M102 N2 MC M102 N2 MCR X6 MCR X7 X10 D C C B B A A Y0 N2 Y1 Y2 N1 Y3 N0 Y4 Y5

Basic Program Instructions 2 2-17 2.15 Set and Reset Program example: Basic points to remember: - Turning ON X0 causes Y0 to turn ON. Y0 remains ON even after X0 turns OFF. - Turning ON X1 causes Y0 to turn OFF. Y0 remains OFF even after X1 turns OFF. - SET and RST instructions can be used for the same device as many times as necessary. However, the last instruction activated determines the current status. - It is also possible to use the RST instruction to reset the contents of data devices such as data registers, index registers etc. The effect is similar to moving ‘K0’ into the data device. Mnemonic Function Format Devices Program steps SET (SET) Sets a bit device permanently ON Y, M, S Y,M:1 S, special M coils:2 RST (ReSeT) Resets a bit device permanently OFF Y, M, S, D, V, Z (see section 2.16 for timers and counters T,C) D, special D registers, V and Z:3 FX1S FX1N FX2N FX2NC SET RST X0 SET Y0 X1 RST Y0 X2 SET M0 X3 RST M0 X4 SET S0 X5 RST S0 X6 RST D0 X Y X Y X M X M 0 0 0 2 0 3 0 LD SET LD RST LD RST SET LD 0 1 3 4 6 7 5 2 8 9 10 11 12 LD SET LD RST LD RST 13 X S X S X D 1 4 0 5 0 6 0 X0 X1 Y0 Resetting timers and counters: • Please see next page.

Basic Program Instructions 2 2-18 2.16 Timer, Counter (Out & Reset) Program example: 2.16.1Basic Timers, Retentive Timers And Counters These devices can all be reset at any time by driving the RST instruction (with the number of the device to be reset). On resetting, all active contacts, coils and current value registers are reset for the selected device. In the example, T246, a 1msec retentive timer, is activate while X1 is ON. When the current value of T246 reaches the preset ‘K’ value, i.e. 1234, the timer coil for T246 will be activated. This drives the NO contact ON. Hence, Y0 is switched ON. Turning ON X0 will reset timer T246 in the manner described previously. Because the T246 contacts are reset, the output Y0 will be turned OFF. Mnemonic Function Format Devices Program steps OUT (OUT) Driving timer or counter coils T, C 32 bit counters:5 Others: 3 RST (ReSeT) Resets timer and counter, coils contacts and current values T, C (see section 2.15 for other resetable devices) T, C:2 FX1S FX1N FX2N FX2NC RST X0 RST T246 X1 K1234 T246 X2 X3 RST X4 D0 C200 T246 Y0 M8200 C200 C200 Y1 Retentive timers: • For more information on retentive timers please see page 4-17.

Basic Program Instructions 2 2-19 2.16.2 Normal 32 bit Counters The 32 bit counter C200 counts (up-count, down-count) according to the ON/OFF state of M8200. In the example program shown on the previous page C200 is being used to count the number of OFF ~ ON cycles of input X4. The output contact is set or reset depending on the direction of the count, upon reaching a value equal (in this example) to the contents of data registers D1,D0 (32 bit setting data is required for a 32 bit counter). The output contact is reset and the current value of the counter is reset to ‘0’ when input X3 is turned ON. 2.16.3 High Speed Counters High speed counters have selectable count directions. The directions are selected by driving the appropriate special auxiliary M coil. The example shown to the right works in the following manner; when X10 is ON, counting down takes place. When X10 is OFF counting up takes place. In the example the output contacts of counter C∆∆∆ and its associated current count values are reset to “0” when X11 is turned ON. When X12 is turned ON the driven counter is enabled. This means it will be able to start counting its assigned input signal (this will not be X12 - high speed counters are assigned special input signals, please see page 4-22). . 32 bit counters: • For more information on 32 bit counters please see page 4-21. X10 X11 RST X12 K/D C M8 C C Y2 Availability of devices: • Not all devices identified here are available on all programmable controllers. Ranges of active devices may vary from PLC to PLC. Please check the specific availability of these devices on the selected PLC before use. For more information on high speed counters please see page 4-22. For PLC device ranges please see chapter 8.

Basic Program Instructions 2 2-20 2.17 Leading and Trailing Pulse Program example: Basic points to remember: - When a PLS instruction is executed, object devices Y and M operate for one operation cycle after the drive input signal has turned ON. - When a PLF instruction is executed, object devices Y and M operate for one operation cycle after the drive input signal has turned OFF. - When the PLC status is changed from RUN to STOP and back to RUN with the input signals still ON, PLS M0 is operated again. However, if an M coil which is battery backed (latched) was used instead of M0 it would not re-activate. For the battery backed device to be re-pulsed, its driving input (ex. X0) must be switched OFF during the RUN/STOP/RUN sequence before it will be pulsed once more. Mnemonic Function Format Devices Program steps PLS (PuLSe) Rising edge pulse Y, M (no special M coils allowed) 2 PLF (PuLse Falling) Falling / trailing edge pulse Y, M (no special M coils allowed) 2 FX1S FX1N FX2N FX2NC PLS PLF X0 PLS M0 M0 SET Y0 X1 PLF M1 M1 RST Y0 0 0 0 1 1 1 0 LD PLS LD SET LD RST PLF LD 0 1 4 5 8 9 6 3 0 X M M M Y M Y X X0 X1 M0 M1 Y0 t msec

Basic Program Instructions 2 2-21 2.18 Inverse Program example: Basic points to remember: - The INV instruction is used to change (invert) the logical state of the current ladder network at the inserted position. - Usage is the same as for AND and ANI; see earlier. Mnemonic Function Format Devices Program steps INV (Inverse) Invert the current result of the internal PLC operations N/A 1 FX1S FX1N FX2N FX2NC X0 PLS M0 M0 SET Y0 X1 PLF M1 M1 RST Y0 0 0 0 1 1 1 0 LD PLS LD SET LD RST PLF LD 0 1 4 5 8 9 6 3 0 X M M M Y M Y X Usages for INV • Use the invert instruction to quickly change the logic of a complex circuit. It is also useful as an inverse operation for the pulse contact instructions LDP, LDF, ANP, etc.

Basic Program Instructions 2 2-22 2.19 No Operation Basic points to remember: - Writing NOP instructions in the middle of a program minimizes step number changes when changing or editing a program. - It is possible to change the operation of a circuit by replacing programmed instructions with NOP instructions. - Changing a LD, LDI, ANB or an ORB instruction with a NOP instruction will change the circuit considerably; quite possibly resulting in an error being generated. - After the program ‘all clear operation’ is executed, all of the instructions currently in the program are over written with NOPs. Mnemonic Function Format Devices Program steps NOP (No Operation) No operation or null step N/A N/A 1 FX1S FX1N FX2N FX2NC

Basic Program Instructions 2 2-23 2.20 End Basic points to remember: - Placing an END instruction in a program forces that program to end the current scan and carry out the updating processes for both inputs and outputs. - Inserting END instructions in the middle of the program helps program debugging as the section after the END instruction is disabled and isolated from the area that is being checked. Remember to delete the END instructions from the blocks which have already been checked. - When the END instruction is processed the PLCs watchdog timer is automatically refreshed. Mnemonic Function Format Devices Program steps END (END) Forces the current program scan to end N/A 1 FX1S FX1N FX2N FX2NC END A program scan: • A program scan is a single processing of the loaded program from start to finish, This includes updating all inputs, outputs and watchdog timers. The time period for one such process to occur is called the scan time. This will be dependent upon program length and complexity. Immediately the current scan is completed the next scan begins. The whole process is a continuous cycle. Updating of inputs takes place at the beginning of each scan while all outputs are updated at the end of the scan.

3 STL Programming 4 Devices in Detail 5 Applied Instructions 6 Diagnostic Devices 7 Instruction Execution Times 8 PLC Device Tables 9 Assigning System Devices 10 Points of Technique 11 Index FX Series Programmable Controllers STL Programming 3

STL Programming 3 Chapter Contents 3. STL Programming .................................................................................3-1 3.1 What is STL, SFC And IEC1131 Part 3?............................................................. 3-1 3.2 How STL Operates .............................................................................................. 3-2 3.2.1 Each step is a program .............................................................................................3-2 3.3 How To Start And End An STL Program ............................................................. 3-3 3.3.1 Embedded STL programs .........................................................................................3-3 3.3.2 Activating new states.................................................................................................3-3 3.3.3 Terminating an STL Program ....................................................................................3-4 3.4 Moving Between STL Steps ................................................................................ 3-5 3.4.1 Using SET to drive an STL coil ................................................................................. 3-5 3.4.2 Using OUT to drive an STL coil................................................................................. 3-6 3.5 Rules and Techniques For STL programs........................................................... 3-7 3.5.1 Basic Notes On The Behavior Of STL programs....................................................... 3-7 3.5.2 Single Signal Step Control ........................................................................................3-9 3.6 Restrictions Of Some Instructions When Used With STL.................................. 3-10 3.7 Using STL To Select The Most Appropriate Program .......................................3-11 3.8 Using STL To Activate Multiple Flows Simultaneously......................................3-12 3.9 General Rules For Successful STL Branching ..................................................3-14 3.10 General Precautions When Using The FX-PCS/AT-EE Software .....................3-15 3.11 Programming Examples ....................................................................................3-16 3.11.1 A Simple STL Flow.................................................................................................. 3-16 3.11.2 A Selective Branch/ First State Merge Example Program.......................................3-18 3.12 Advanced STL Use............................................................................................3-20

3-1 3. STL Programming This chapter differs from the rest of the contents in this manual as it has been written with a training aspect in mind. STL/SFC programming, although having been available for many years, is still misunderstood and misrepresented. We at Mitsubishi would like to take this opportunity to try to correct this oversight as we see STL/SFC programming becoming as important as ladder style programming. 3.1 What is STL, SFC And IEC1131 Part 3? The following explanation is very brief but is designed to quickly outline the differences and similarities between STL, SFC and IEC1131 part 3. In recent years Sequential Function Chart (or SFC) style programming (including other similar styles such as Grafcet and Funktionplan) have become very popular through out Europe and have prompted the creation of IEC1131 part 3. The IEC1131 SFC standard has been designed to become an interchangeable programming language. The idea being that a program written to IEC1131 SFC standards on one manufacturers PLC can be easily transferred (converted) for use on a second manufacturers PLC. STL programming is one of the basic programming instructions included in all FX PLC family members. The abbreviation STL actually means STep Ladder programming. STL programming is a very simple concept to understand yet can provide the user with one of the most powerful programming techniques possible. The key to STL lies in its ability to allow the programmer to create an operational program which ‘flows’ and works in almost exactly the same manner as SFC. This is not a coincidence as this programming technique has been developed deliberately to achieve an easy to program and monitor system. One of the key differences to Mitsubishi’s STL programming system is that it can be entered into a PLC in 3 formats. These are: Ι) Instruction - a word/mnemonic entry system ΙΙ) Ladder - a graphical program construction method using a relay logic symbols ΙΙΙ) SFC - a flow chart style of STL program entry (similar to SFC) Examples of these programming methods can be seen on page 2-1. FX1S FX1N FX2N FX2NC General note: • IEC1131-3: 03.1993 Programmable controllers; part 3: programming languages. The above standard is technically identical to the ‘Euro-Norm’ EN61131-3: 07.1993 FX Series Programmable Controllers

STL Programming 3 3-2 3.2 How STL Operates As previously mentioned, STL is a system which allows the user to write a program which functions in much the same way as a flow chart, this can be seen in the diagram opposite. STL derives its strength by organizing a larger program into smaller more manageable parts. Each of these parts can be referred to as either a state or a step. To help identify the states, each is given a unique identification number. These numbers are taken from the state relay devices (see page 4-6 for more details). 3.2.1 Each step is a program Each state is completely isolated from all other states within the whole program. A good way to envisage this, is that each state is a separate program and the user puts each of those programs together in the order that they require to perform their task. Immediately this means that states can be reused many times and in different orders. This saves on programming time AND cuts down on the number of programming errors encountered. A Look Inside an STL On initial inspection the STL program looks as if it is a rather basic flow diagram. But to find out what is really happening the STL state needs to be put ‘under a microscope’ so to speak. When a single state is examined in more detail, the sub-program can be viewed. With the exception of the STL instruction, it will be immediately seen that the STL sub-program looks just like ordinary programming. �The STL instruction is shown as a ‘fat’ normally open contact. All programming after an STL instruction is only active when the associated state coil is active. �The transition condition is also written using standard programming. This idea re-enforces the concept that STL is really a method of sequencing a series of events or as mentioned earlier ‘of joining lots of smaller programs together’. M8002 X0 X1 S 0 S 26 X0 X1 X15 S 22 S 27 T0 T7 S 22 T0 1 2 STL S 22 SET S 27 T0 Y22 K20 2 1 T0

STL Programming 3 3-3 Combined SFC Ladder representation Sometimes STL programs will be written in hard copy as a combination of both flow diagram and internal sub-program. (example shown below). Identification of contact states 3.3 How To Start And End An STL Program Before any complex programming can be undertaken the basics of how to start and more importantly how to finish an STL program need to be examined. 3.3.1 Embedded STL programs An STL style program does not have to entirely replace a standard ladder logic program. In fact it might be very difficult to do so. Instead small or even large section of STL program can be entered at any point in a program. Once the STL task has been completed the program must go back to processing standard program instructions until the next STL program block. Therefore, identifying the start and end of an STL program is very important. 3.3.2 Activating new states Once an STL step has been selected, how is it used and how is the program ‘driven’? This is not so difficult, if it is considered that for an STL step to be active its associated state coil must be ON. Hence, to start an STL sequence all that has to be done is to drive the relevant state ON. There are many different methods to drive a state, for example the initial state coils could be pulsed, SET or just included in an OUT instruction. However, within Mitsubishi’s STL programming language an STL coil which is SET has a different meaning than one that is included in an OUT instruction. M8002 X0 X1 S 0 S 26 X0 X1 X15 S 22 S 27 K20 K20 T0 T7 Y22 T0 Y27 T7 Y20 Y26 • Please note the following convention is used: � Normally Open contact � Normally Closed contact Common alternatives are ‘a’ and ‘b’ identifiers for Normally Open, Normally Closed states or often a line drawn over the top of the Normally Closed contact name is used, e.g. X000. LD OUT LD SET STL OUT LDI OUT RET LD OUT RST X000 Y004 X002 S009 S009 Y010 X003 Y006 X005 Y007 M080 Normal Ladder Program Embedded STL Program STL S 22 SET S 27 T0 Y22 T0 K20 STL S 27 Note: For normal STL operation it is recommended that the states are selected using the SET instruction. To activate an STL step its state coil is SET ON.

STL Programming 3 3-4 Initial Steps For an STL program which is to be activated on the initial power up of the PLC, a trigger similar to that shown opposite could be used, i.e. using M8002 to drive the setting of the initial state. The STL step started in this manner is often referred to as the initial step. Similarly, the step activated first for any STL sequence is also called the initial step. 3.3.3 Terminating an STL Program Once an STL program has been started the programmable controllers CPU will process all fol- lowing instructions as being part of that STL program. This means that when a second pro- gram scan is started the normal instructions at the beginning of the program are considered to be within the STL program. This is obviously incorrect and the CPU will proceed to identify a programming error and disable the programmable controllers operation. This scenario may seem a little strange but it does make sense when it is considered that the STL program must return control to the ladder program after STL operation is complete. This means the last step in an STL program needs to be identified in some way. Returning to Standard Ladder This is achieved by placing a RET or RETurn instruction as the last instruction in the last STL step of an STL program block. This instruction then returns programming con- trol to the ladder sequence. STL S005 M8002 SET S005 X001 X000 X012 X013 Y000 Y011 Y014 STL S005 M8002 SET S005 X001 X000 X012 X013 Y000 Y011 Y014 RET Note: The RET instruction can be used to separate STL programs into sections, with stan- dard ladder between each STL program. For display of STL in SFC style format the RET instruction is used to indicate the end of a complete STL program.

STL Programming 3 3-5 3.4 Moving Between STL Steps To activate an STL step the user must first drive the state coil. Setting the coil has already been identified as a way to start an STL program, i.e. drive an initial state. It was also noted that using an OUT statement to driving a state coil has a different meaning to the SET instruction. These difference will now be explained: 3.4.1 Using SET to drive an STL coil • SET is used to drive an STL state coil to make the step active. Once the current STL step activates a second following step, the source STL coil is reset. Hence, although SET is used to activate a state the resetting is automatic. However, if an STL state is driven by a series of standard ladder logic instructions, i.e. not a preceding STL state, then standard programming rules apply. In the example shown opposite S20 is not reset even after S30 or S21 have been driven. In addition, if S20 is turned OFF, S30 will also stop operating. This is because S20 has not been used as an STL state. The first instruction involving the status of S20 is a standard LoaD instruction and NOT an STL instruction. • SET is used to drive an immediately following STL step which typically will have a larger STL state number than the current step. • SET is used to drive STL states which occur within the enclosed STL program flow, i.e. SET is not used to activate a state which appears in an unconnected, second STL flow diagram. X000 SET S021 S040 S020 RST S022 S020 S030 X000 ZRST S21 S28 Note: If a user wishes to forcibly reset an STL step, using the RST or ZRST (FNC 40) instructions would perform this task.

STL Programming 3 3-6 3.4.2 Using OUT to drive an STL coil This has the same operational features as using SET. However, there is one major function which SET is not used. This is to make what is termed ‘distant jumps’. OUT is used for loops and jumps If a user wishes to ‘jump’ back up a program, i.e. go back to a state which has already been processed, the OUT instruction would be used with the appropriate STL state number. Alternatively the user may wish to make a large ‘jump’ forwards skipping a whole section of STL programmed states. Out is used for distant jumps If a step in one STL program flow was required to trigger a step in a second, separate STL program flow the OUT instruction would be used. S 0 S 22 S 20 S 21 OUT S 23 S 0 S 20 S 21 S 23 S 22 OUT Partial repeat Program jump S 0 S 20 S 21 S 23 S 22 OUT S 1 S 40 S 41 S 44 S 43 S 42 STL flow 1 STL flow 2 Note: Although it is possible to use SET for jumps and loops use of OUT is needed for display of STL in SFC like structured format.

STL Programming 3 3-7 3.5 Rules and Techniques For STL programs It can be seen that there are a lot of advantages to using STL style programming but there are a few points a user must be aware of when writing the STL sub-programs. These are highlighted in this section. 3.5.1 Basic Notes On The Behavior Of STL programs • When an STL state becomes active its program is processed until the next step is triggered. The contents of the program can contain all of the programming items and features of a standard ladder program, i.e. LoaD, AND OR, OUT, ReSeT etc., as well as applied instructions. • When writing the sub-program of an STL state, the first vertical ‘bus bar’ after the STL instruction can be considered in a similar manner as the left hand bus bar of a standard ladder program. • In normal programming using dual coils is not an acceptable technique. However repetition of a coil in separate STL program blocks is allowed. STL S005 Y000 Y011 Y014 RET X001 X000 X012 X013 1 Each STL step makes its own bus bar. This means that a user, cannot use an MPS instruction directly after the STL instruction (see �), i.e. There needs to be at least a single contact before the MPS instruction. Note: Using out coils and even applied instructions immediately after an STL instruction is permitted. M111 S 30 S 31 S 32 M111 M112 This is because the user can take advantage of the STL’s unique feature of isolating all STL steps except the active STL steps. This means in practice that there will be no conflict between dual coils. The example opposite shows M111 used twice in a single STL flow. Caution: The same coil should NOT be programmed in steps that will be active at the same time as this will result in the same problem as other dual coils.

STL Programming 3 3-8 T001 S 30 S 31 T001 S 32 K20 T001 K50 T001 Y11 S 30 S 31 Y10 Y10 Y11 • When an STL step transfers control to the next STL step there is a period (one scan) while both steps are active. This can cause problems with dual coils; particularly timers. If timers are dual coiled care must be taken to ensure that the timer operation is completed during the active STL step. If the same timer is used in consecutive steps then it is possible that the timer coil is never deactivated and the contacts of the timer will not be reset leading to incorrect timer operation. The example opposite identifies an unacceptable use of timer T001. When control passes from S30 to S31 T001 is not reset because its coil is still ON in the new step. Note: As a step towards ensuring the correct operation of the dual timers they should not be used in consecutive STL steps. Following this simple rule will ensure each timer will be reset correctly before its next operation. • As already mentioned, during the transfer between steps, the current and the selected steps will be simultaneously active for one program scan. This could be thought of as a hand over or handshaking period. This means that if a user has two outputs contained in consecutive steps which must NOT be active simultaneously they must be interlocked. A good example of this would be the drive signals to select a motors rotation direction. In the example Y11 and Y10 are shown interlocked with each other.

STL Programming 3 3-9 3.5.2 Single Signal Step Control Transferring between active STL steps can be controlled by a single signal. There are two methods the user can program to achieve this result. Method 1 - Using locking devices In this example it is necessary to program separate locking devices, and the controlling signal must only pulse ON. This is to prevent the STL programs from running through. The example shown below identifies the general program required for this method. - S30 is activated when M0 is first pulsed ON. - The operation of M1 prevents the sequence from continuing because although M0 is ON, the transfer requirements, need M0 to be ON and M1 to be OFF. - After one scan the pulsed M0 and the ‘lock’ device M1 are reset. - On the next pulse of M0 the STL step will transfer program control from S31 to the next step in a similar manner. This time using M2 as the ‘lock’ device because dual coils in successive steps is not allowed. - The reason for the use of the ‘lock’ devices M1 and M2 is because of the handshaking period when both states involved in the transfer of program control are ON for 1 program scan. Without the ‘locks’ it would be possible to immediately skip through all of the STL states in one go! Method 2 - Special Single Pulse Flags Using the pulse contacts (LDP, LDF, ANP, etc.) and a special range of M devices (M2800 to M3071) the same result as method 1 can be achieved. The special feature of these devices prevents run through of the states, as only the first occurrence of the LDP instruction will activate. The example program below shows the necessary instructions. - Assume S50 is already active. - When X01 activates M2800, this in turn activates the LDP M2800 instruction in S50 and the flow moves on to step S51. - The LDP M2800 instruction in the transition part of S51 does not execute because this is the second occurrence of M2800 in a pulse contact. - When X01 next activates M2800, the LDP instruction in S51 is the first occurrence because S50 is now inactive. Thus, control passes to the next step in the same manner. FX1S FX1N FX2N FX2NC M1 PLS M0 S 30 S 31 M2 PLS M1 M2 M0 M0 FX1S FX1N FX2N FX2NC S50 S51 M2800 M2800 LAD0 M2800 M2800 M2800 X001 SET S51 M2800 SET Snn M2800 Do not usethe step control devicein a pulsecontact withinthe main programbody.

STL Programming 3 3-10 3.6 Restrictions Of Some Instructions When Used With STL Although STL can operate with most basic and applied instructions there are a few exceptions. As a general rule STL and MC-MCR programming formats should not be combined. Other instruction restrictions are listed in the table below. Restrictions on using applied instructions Operational State Basic Instructions LD, LDI, AND, ANI, OR,ORI, NOP, OUT, SET, RST, PLS,PLF ANB, ORB, MPS,MRD, MPP MC, MCR Initial and general states � � � Branch- ing and merging states Output processing � � � Transfer processing � � � STL S** SET STL S** SET STL STL STL S** SET • Most applied instructions can be used within STL programs. Attention must be paid to the way STL isolates each non-active step. It is recommended that when applied instructions are used their operation is completed before the active STL step transfers to the next step. Other restrictions are as follows: - FOR - NEXT structures can not contain STL program blocks. - Subroutines and interrupts can not contain STL program blocks. - STL program blocks can not be written after an FEND instruction. - FOR - NEXT instructions are allowed within an STL program with a nesting of up to 4 levels. For more details please see the operational compatibility listed in the two tables on pages 7-12,7-13. Using ‘jump’ operations with STL • Although it is possible to use the program jump operations (CJ instruction) within STL program flows, this causes additional and often unnecessary program flow complications. To ensure easy maintenance and quick error finding it is recommended that users do not write jump instructions into their STL programs.

STL Programming 3 3-11 3.7 Using STL To Select The Most Appropriate Program So far STL has been considered as a simple flow charting programming language. One of STL’s exceptional features is the ability to create programs which can have several operating modes. For example certain machines require a selection of ‘manual’ and ‘automatic’ modes, other machines may need the ability to select the operation or manufacturing processes required to produce products ‘A’, ‘B’, ‘C’, or ‘D’. STL achieves this by allowing multiple program branches to originate from one STL state. Each branch is then programmed as an individual operating mode, and because each operating mode should act individually, i.e. there should be no other modes active; the selection of the program branch must be mutually exclusive. This type of program construction is called “Selective Branch Programming”. An example instruction program can be seen below, (this is the sub-program for STL state S20 only) notice how each branch is SET by a different contact. A programming construction to split the program flow between different branches is very useful but it would be more useful if it could be used with a method to rejoin a set of individual branches. This type of STL program construction is called a “First State Merge” simply because the first state (in the example S29, S39 or S49) to complete its operation will cause the merging state (S50) to be activated. It should be noticed how each of the final STL states on the different program branches call the same “joining” STL state. FX1S FX1N FX2N FX2NC Y0 X0 X1 X2 S Y X S X S X S 20 0 21 1 31 2 41 STL OUT LD SET LD SET SET LD 0 S 21 S 31 S 41 S 20 Y10 S 29 X10 S 39 S 49 X11 X12 Y11 Y12 S 50 STL OUT S Y 39 11 STL OUT S Y 49 12 LD SET X S 10 50 LD SET X S 11 50 LD SET X S 12 50 STL OUT S Y 29 10

STL Programming 3 3-12 3.8 Using STL To Activate Multiple Flows Simultaneously In the previous branching technique, it was seen how a single flow could be selected from a group. The following methods describe how a group of individual flows can be activated simultaneously. Applications could include vending machines which have to perform several tasks at once, e.g. boiling water, adding different taste ingredients (coffee, tea, milk, sugar) etc. In the example below when state S20 is active and X0 is then switched ON, states S21, S31 and S41 are ALL SET ON as the next states. Hence, three separate, individual, branch flows are ‘set in motion’ from a single branch point. This programming technique is often called a ‘Parallel Branch’. To aid a quick visual distinction, parallel branches are marked with horizontal, parallel lines. Limits on the number of branches • Please see page 3-14 for general notes on programming STL branches. Notes on using the FX-PCS/AT-EE software • Please see page 3-15 for precautions when using the FX-PCS-AT/EE software. FX1S FX1N FX2N FX2NC Y0 X0 S Y X S 20 0 21 STL OUT LD SET 0 S 21 S 31 S 41 S 20 SET SET 31 41 S S

STL Programming 3 3-13 When a group of branch flows are activated, the user will often either; a) ‘Race’ each flow against its counter parts. The flow which completes fastest would then activate a joining function (“First State Merge” described in the previous section) OR b) The STL flow will not continue until ALL branch flows have completed there tasks. This is called a ‘Multiple State Merge”. An explanation of Multiple State Merge now follows below. In the example below, states S29, S39 and S49 must all be active. If the instruction list is viewed it can be seen that each of the states has its own operating/processing instructions but that also additional STL instructions have been linked together (in a similar concept as the basic AND instruction). Before state S50 can be activated the trigger conditions must also be active, in this example these are X10, X11 and X12. Once all states and input conditions are made the merging or joining state can be SET ON. As is the general case, all of the states used in the setting procedure are reset automatically. Because more than one state is being simultaneously joined with further states (some times described as a parallel merge), a set of horizontal parallel lines are used to aid a quick visual recognition. Y10 S 29 S 39 S 49 Y11 Y12 S 50 STL OUT S Y 39 11 STL OUT S Y 49 12 STL OUT S Y 29 10 X10 X11 X12 STL STL STL LD AND AND SET S S S X X X S 29 39 49 10 11 12 50 Limits on the number of branches • Please see page 3-14 for general notes on programming STL branches. Notes on using the FX-PCS/AT-EE software • Please see page 3-15 for precautions when using the FX-PCS-AT/EE software.

STL Programming 3 3-14 3.9 General Rules For Successful STL Branching For each branch point 8 further branches may be programmed. There are no limits to the num- ber of states contained in a single STL flow. Hence, the possibility exists for a single initial state to branch to 8 branch flows which in turn could each branch to a further 8 branch flows etc. If the programmable controllers program is read/written using instruction or ladder formats the above rules are acceptable. However, users of the FX-PCS/AT-EE programming package who are utilizing the STL programming feature are constrained by further restrictions to enable automatic STL program conversions (please see page 3-15 for more details). When using branches, different types of branching /merging cannot be mixed at the same branch point. The item marked with a ‘S’ are transfer condition which are not permitted. The following branch configurations/modifications are recommended: S 40 S 30 S 20 S 60 S 50 X0 X0 X1 S 30 S 20 S 30 S 20 X2 X1 X0 X0 X1 X2 S 60 S 50 X3 X4 S 30 S 40 S 20 X0 X1 X2 S 60 S 50 X3 X4 S 30 S 40 S 20 S 100 (S100) (S100) S 40 S 30 S 20 S 60 S 50 X0 S 101 (S101) 20 0 100 30 1 100 40 2 100 100 100 3 50 100 4 60 S X S S X S S X S S S X S S X S STL LD SET STL LD SET STL LD SET STL LD AND SET LD AND SET S 50 S 40 S 50 S 40 X0 X1 S 30 S 20 (S102) S 50 S 40 S 30 S 20 X1 X2 (S103) S 103 S 102 (S103) X0 S 50 S 40 20 30 40 0 101 101 101 50 60 S S S X S S S S S STL STL STL LD SET STL LD SET SET STL LD SET STL LD SET STL LD SET SET S X S S X S S S S S 20 0 102 30 102 102 102 40 50 1 STL STL LD S S X S S S X S S X S SET STL LD AND SET LD AND SET 20 30 0 103 103 103 1 40 103 2 50 Rewrite as Rewrite as Dummy state Dummy state Dummy state Dummy state In Instruction format... In Instruction format...

STL Programming 3 3-15 3.10 General Precautions When Using FX-PCS/AT-EE Software This software has the ability to program in SFC flow diagrams. As part of this ability it can read and convert existing STL programs back into SFC flows even if they were never originally programmed using the FX-PCS/AT-EE software. As an aid to allowing this automatic SFC flow generation the following rules and points should be noted: 1) When an STL flow is started it should be initialized with one of the state devices from the range S0 to S9. 2) Branch selection or merging should always be written sequentially moving from left to right. This was demonstrated on page 3-11, i.e. on the selective branch S21 was specified before S31 which was specified before S41. The merge states were programmed in a similar manner, S29 proceeded S39 which proceeded S49. 3) The total number of branches which can be programmed with the STL programming mode are limited to a maximum of 16 circuits for an STL flow. Each branch point is limited to a maximum of 8 branching flows. This means two branch points both of 8 branch flows would equal the restriction. These restrictions are to ensure that the user can always view the STL flow diagram on the computer running the FX-PCS-AT/ EE software and that when it is needed, the STL program flow can be printed out clearly. X0 X2 X3 S 21 S 22 S 20 X7 S 29 X1 X5 X6 S 23 S 24 X4 X10 X12 X13 S 25 S 26 X17 X11 X15 X16 S 27 S 28 X14 X2 X3 S 21 S 22 X1 X5 X6 S 23 S 24 X4 X12 X13 S 25 S 26 X11 X15 X16 S 27 S 28 X14 X0 X0 X10 X10 S 20 X7 X7 X17 X17 S 29 X0 S 20 X6 S 29 X1 X7 X2 S 21 S 22 X3 S 23 S 24 X4 S 25 S 26 X5 S 27 S 28 20 0 21 23 1 25 27 S X S S X S S STL LD SET SET LD SET SET S 22 STL 24 6 29 26 28 7 29 S X S S S X S STL LD SET STL STL LD SET Further recommended program changes: Rewrite as... Rewrite as... Program violation! FX1S FX1N FX2N FX2NC

STL Programming 3 3-16 3.11 Programming Examples 3.11.1 A Simple STL Flow This simple example is an excerpt from a semi-automatic loading-unloading ore truck program. This example program has a built in, initialization routine which occurs only when the PLC is powered from OFF to ON. This is achieved by using the special auxiliary relay M8002. This activates a Zone ReSeT (ZRST is applied instruction 40) instruction which ensures all of the operational STL states within the program are reset. The program example opposite shows an M8002/ZRST example. The push button X0 acts as a start button and a mode selection button. The STL state S0 is initialized with the ZRST instruction. The system waits until inputs X0 and X2 are given and Y 13 is not active. In the scenario this means the ore truck is positioned at the ore discharge point, i.e. above the position sensor X2. The ore truck is not currently discharging its load, i.e. the signal to open the trucks unloading doors (Y13) is not active and the start button (X0) has been given. Once all of the points have been met the program steps on to state S21. On this state the ore cart is moved (Y10) and positioned (X1) at the loading hopper. If the start button (X0) is pressed during this stage the ore cart will be set into a repeat mode (M2 is reset) where the ore truck is immediately returned to the loading hopper after discharging its current load. This repeat mode must be selected on every return to the loading station. Once at the loading point the program steps onto state S22. This state opens the hoppers doors (Y11) and fills the truck with ore. After a timed duration, state S23 is activated and the truck returns (Y12) to the discharge point (X2). FX1S FX1N FX2N FX2NC Y13 X0 Y10 Y12 X2 X1 Y11 Loading hopper Ore truck Ore dischange point Start button M8002 ZRST S21 S25

STL Programming 3 3-17 Once at the discharge point the truck opens its bottom doors (Y13). After a timed duration in which the truck empties its contents, the program checks to see if the repeat mode was selected on the last cycle, i.e. M2 is reset. If M2 was reset (in state S21) the program ‘jumps’ to step S21 and the ore truck is returned for immediate refilling. If M2 is not reset, i.e. it is active, the program cycles back to STL state S0 where the ore truck will wait until the start push button is given. This is a simple program and is by no means complete but it identifies the way a series of tasks have been mapped to an STL flow. Y10 X1 Y11 X0 T1 Y12 X2 ZRST S 25 STL SET S 21 S 21 Y10 RST M 2 X0 STL S 22 Y11 SET S 23 T1 SET S 22 STL S 23 Y12 SET S 24 X2 X1 STL S 24 Y13 T2 M2 STL S 25 RET END STL S 0 X0 X2 Y13 T1 K70 T2 K50 M2 T2 SET S 25 M2 SET M 2 SET S 0 M8002 S 21 S 0 RST M2 X0 X2 Y13 T1 K70 Y13 T2 K50 M2 M2 SET M2 M2 2 50 2 2 25 2 2 0 25 2 2 21 OUT K LD ANI SET LD AND OUT STL SET LD OUT RET END T T M S T M S S M M S 1 22 22 11 1 70 1 23 23 12 2 24 24 13 X S S Y T T S S Y X S S Y LD SET STL OUT OUT K LD SET STL OUT LD SET STL OUT 8002 0 21 40 25 0 0 2 13 21 21 10 0 2 M S S S S X X Y S S Y X M LD SET ZRST STL LD ANI AND SET STL OUT LD RST S 21 S 22 S 23 S 24 S 25 T2 S 0 S 21 Identification of normally closed contacts This example has used the line convention to identify normally closed contacts, for further variations and different methods used to perform this task please see the information note page 3-3.

STL Programming 3 3-18 3.11.2 A Selective Branch/ First State Merge Example Program The following example depicts an automatic sorting robot. The robot sorts two sizes of ball bearings from a mixed ‘source pool’ into individual storage buckets containing only one type of ball bearing. The sequence of physical events (from initial power On) are: 1) The pickup arm is moved to its zero-point when the start button (X12) is pressed. When the pickup arm reaches the zero-point the zero-point lamp (Y7) is lit. 2) The pickup arm is lowered (Y0) until a ball is collected (Y1). If the lower limit switch (X2) is made a small ball bearing has been collected; consequently no lower limit switch signal means a large ball bearing has been collected. Note, a proximity switch (X0) within the ‘source pool’ identifies the availability of ball bearings. 3) Depending on the collected ball, the pickup arm retracts (output Y2 is operated until X3 is received) and moves to the right (Y3) where it will stop at the limit switch (X4 or X5) indicating the container required for storage. 4) The program continues by lowering the pickup arm (Y0) until the lower limit switch (X2) is reached. 5) The collected ball being is released (Y1 is reset). 6) The pickup arm is retracted (Y2) once more. 7) The pickup arm is traversed back (Y4) to the zero-point (X1). Y3 Y4 X12 Y7 X1 X3 X4 X5 X2 X0 Y1 Y2 Y0 Points to note • The Selective Branch is used to choose the delivery program for either small ball bearings or large ball bearings. Once the destination has been reached (i.e. step S24 or S27 has been executed) the two independent program flows are rejoined at step S30. • The example program shown works on a single cycle, i.e. every time a ball is to be retrieved the start button (X12) must be pressed to initiate the cycle.

STL Programming 3 3-19 Full STL flow diagram/program. Y0 T0 T1 S 0 X12 Y7 X2 T0 Y2 Y3 X4 RST Y1 K20 S 21 S 22 SET Y1 K10 S 23 T1 S 24 T2 X3 T0 T1 X2 Y2 Y3 X5 S 25 SET Y1 K10 S 26 T1 S 27 X3 X4 X5 T2 S 32 Y2 K10 S 30 X2 S 31 Y0 X3 S 33 Y4 X1 X1 Start Zero-point arrival Lower pickup arm This example uses the dot notation to identify normally open and normally closed contacts. Normally open contacts Normally closed contacts Lower limit = small ball Collect ball Raise pickup arm Upper limit reached Move to small ball bucket Lower limit = large ball Collect ball Raise pickup arm Upper limit reached Move to large ball bucket Lower pickup arm Lower limit reached Release ball Raise pickup arm Upper limit reached Return to zero-point Zero-point reached

STL Programming 3 3-20 3.12 Advanced STL Use STL programming can be enhanced by using the Initial State Applied Instruction. This instruction has a mnemonic abbreviation of IST and a special function number of 60. When the IST instruction is used an automatic assignment of state relays, special auxiliary relays (M coils) is made. The IST instruction provides the user with a pre-formatted way of creating a multi-mode program. The modes available are: a) Automatic: - Single step - Single cycle - Continuous b) Manual: - Operator controlled - Zero return More details on this instruction can be found on page 5-85.

3 STL Programming 4 Devices in Detail 5 Applied Instructions 6 Diagnostic Devices 7 Instruction Execution Times 8 PLC Device Tables 9 Assigning System Devices 10 Points of Technique 11 Index FX Series Programmable Controllers Devices in Detail 4

Devices in Detail 4 Chapter Contents 4. Devices in Detail....................................................................................4-1 4.1 Inputs................................................................................................................... 4-1 4.2 Outputs ................................................................................................................ 4-2 4.3 Auxiliary Relays ................................................................................................... 4-3 4.3.1 General Stable State Auxiliary Relays ......................................................................4-3 4.3.2 Battery Backed/ Latched Auxiliary Relays.................................................................4-4 4.3.3 Special Diagnostic Auxiliary Relays .......................................................................... 4-5 4.3.4 Special Single Operation Pulse Relays.....................................................................4-5 4.4 State Relays ........................................................................................................ 4-6 4.4.1 General Stable State - State Relays .........................................................................4-6 4.4.2 Battery Backed/ Latched State Relays......................................................................4-7 4.4.3 STL Step Relays .......................................................................................................4-8 4.4.4 Annunciator Flags .....................................................................................................4-9 4.5 Pointers ............................................................................................................. 4-10 4.6 Interrupt Pointers ...............................................................................................4-11 4.6.1 Input Interrupts ........................................................................................................4-12 4.6.2 Timer Interrupts .......................................................................................................4-12 4.6.3 Disabling Individual Interrupts .................................................................................4-13 4.6.4 Counter Interrupts ...................................................................................................4-13 4.7 Constant K.........................................................................................................4-14 4.8 Constant H.........................................................................................................4-14 4.9 Timers................................................................................................................4-15 4.9.1 General timer operation...........................................................................................4-16 4.9.2 Selectable Timers....................................................................................................4-16 4.9.3 Retentive Timers .....................................................................................................4-17 4.9.4 Timers Used in Interrupt and ‘CALL’ Subroutines ...................................................4-18 4.9.5 Timer Accuracy .......................................................................................................4-18 4.10 Counters ............................................................................................................4-19 4.10.1 General/ Latched 16bit UP Counters ......................................................................4-20 4.10.2 General/ Latched 32bit Bi-directional Counters.......................................................4-21 4.11 High Speed Counters ........................................................................................4-22 4.11.1 Basic High Speed Counter Operation .....................................................................4-23 4.11.2 Availability of High Speed Counters .......................................................................4-24 4.11.3 1 Phase Counters - User Start and Reset (C235 - C240) .......................................4-26 4.11.4 1 Phase Counters - Assigned Start and Reset (C246 to C250) ..............................4-27 4.11.5 2 Phase Bi-directional Counters (C246 to C250) ....................................................4-28 4.11.6 A/B Phase Counters (C252 to C255) ......................................................................4-29 4.12 Data Registers...................................................................................................4-30 4.12.1 General Use Registers ............................................................................................ 4-31 4.12.2 Battery Backed/ Latched Registers .........................................................................4-32 4.12.3 Special Diagnostic Registers...................................................................................4-32 4.12.4 File Registers ..........................................................................................................4-33 4.12.5 Externally Adjusted Registers .................................................................................4-34 4.13 Index Registers.................................................................................................. 4-35 4.13.1 Modifying a Constant...............................................................................................4-36 4.13.2 Misuse of the Modifiers ...........................................................................................4-36 4.13.3 Using Multiple Index Registers................................................................................4-36 4.14 Bits, Words, BCD and Hexadecimal..................................................................4-37 4.14.1 Bit Devices, Individual and Grouped .......................................................................4-37 4.14.2 Word Devices ..........................................................................................................4-39 4.14.3 Interpreting Word Data ............................................................................................ 4-39 4.14.4 Two’s Compliment...................................................................................................4-42 4.15 Floating Point And Scientific Notation ...............................................................4-43 4.15.1 Scientific Notation....................................................................................................4-44 4.15.2 Floating Point Format ..............................................................................................4-45 4.15.3 Summary Of The Scientific Notation and Floating Point Numbers..........................4-46

4-1 4. Devices in Detail 4.1 Inputs Device Mnemonic: X Purpose: Representation of physical inputs to the programmable controller (PLC) Alias: I/P Inp (X) Input Input contact Available forms: NO (�) and NC (�) contacts only (see example device usage for references) Devices numbered in: Octal, i.e. X0 to X7, X10 to X17 Further uses: None Example device usage: FX1S FX1N FX2N FX2NC X0 X1 Y10 2 1 Available devices: • Please see the information point on page 4-2, Outputs. Alternatively refer to the relevant tables for the selected PLC in chapter 8. Configuration details: • Please see chapter 9 FX Series Programmable Controllers

Devices in Detail 4 4-2 4.2 Outputs Device Mnemonic: Y Purpose: Representation of physical outputs from the programmable controller Alias: O/P Otp Out (Y) Output (Y) Output (coil/ relay/ contact) Available forms: NO (�) and NC contacts and output coils (�) (see example device usage for references) Devices numbered in: Octal, i.e. Y0 to Y7, Y10 to Y17 Further uses: None Example device usage: • Please note, these are all the absolute maximums which are available. The values are subject to variations caused by unit selection. For configuration details please see chapter 9. • For more information about the device availability for individual PLCs, please see chapter 8. PLC Maximum number of inputs Maximum number of outputs Absolute total available I/O FX1S 16 14 30 FX1N 128 128 128 FX2N 256 (addressable in software) 256 (addressable in software) 256 (Total addressed in software/hardware) FX2NC FX1S FX1N FX2N FX2NC X0 X1 Y10 1 Y10 2 Available devices:

Devices in Detail 4 4-3 4.3 Auxiliary Relays Device Mnemonic: M Purpose: Internal programmable controller status flag Alias: Auxiliary (coil/ relay/ contact/ flag) M (coil/ relay/ contact /flag) M (bit) device Available forms: NO (�) and NC contacts and output coils (�) (see example device usage for references) Devices numbered in: Decimal, i.e. M0 to M9, M10 to M19 Further uses: General stable state auxiliary relays - see page 4-3 Battery backed/ latched auxiliary relays - see page 4-4 Special diagnostic auxiliary relays - see page 4-5 Example device usage: 4.3.1 General Stable State Auxiliary Relays • A number of auxiliary relays are used in the PLC. The coils of these relays are driven by device contacts in the PLC in the same manner that the output relays are driven in the program. All auxiliary relays have a number of electronic NO and NC contacts which can be used by the PLC as required. Note that these contacts cannot directly drive an external load. Only output relays can be used to do this. • For more information about device availability for individual PLCs, please see chapter 8. PLC FX1S FX1N FX2N FX2NC General auxiliary relays 384 (M0 - 383) 384 (M0 - 383) 500 (M0 - 499) 500 (M0 - 499) Battery backed/ latched relays 128 (M384 - 511) 1152 (M384 - 1535) 2572 (M500 - 3071) 2572 (M500 - 3071) Total available 512 1536 3072 3072 FX1S FX1N FX2N FX2NC X0 X1 1 M507 2 M507 Available devices:

Devices in Detail 4 4-4 4.3.2 Battery Backed/ Latched Auxiliary Relays There are a number of battery backed or latched relays whose status is retained in battery backed or EEPROM memory. If a power failure should occur all output and general purpose relays are switched off. When operation is resumed the previous status of these relays is restored. The circuit shown on page 4-3 is an example of a self retaining circuit. Relay M507 is activated when X0 is turned ON. If X0 is turned OFF after the activation of M507, the ON status of M507 is self retained, i.e. the NO contact M507 drives the coil M507. However, M507 is reset (turned OFF) when the input X1 is turned ON, i.e. the NC contact is broken. A SET and RST (reset) instruction can be used to retain the status of a relay being activated momentarily. X0 SET M507 RST M507 X1 External loads: • Auxiliary relays are provided with countless number of NO contact points and NC contact points. These are freely available for use through out a PLC program. These contacts cannot be used to directly drive external loads. All external loads should be driven through the use of direct (Y) outputs.

Devices in Detail 4 4-5 4.3.3 Special Diagnostic Auxiliary Relays A PLC has a number of special auxiliary relays. These relays all have specific functions and are classified into the following two types. a) Using contacts of special auxiliary relays - Coils are driven automatically by the PLC. Only the contacts of these coils may be used by a user defined program. Examples: M8000: RUN monitor (ON during run) M8002: Initial pulse (Turned ON momentarily when PLC starts) M8012: 100 msec clock pulse b) Driving coils of special auxiliary relays - A PLC executes a predetermined specific operation when these coils are driven by the user. Examples: M8033: All output statuses are retained when PLC operation is stopped M8034: All outputs are disabled M8039: The PLC operates under constant scan mode 4.3.4 Special Single Operation Pulse Relays When used with the pulse contacts LDP, LDF, etc., M devices in the range M2800 to M3072 have a special meaning. With these devices, only the next pulse contact instruction after the device coil is activated. Available devices: • Not all PLC’s share the same range, quantity or operational meaning of diagnostic auxiliary relays. Please check the availability and function before using any device. PLC specific diagnostic ranges and meanings are available in chapter 6. FX1S FX1N FX2N FX2NC M0 M0 M0 M0 SET M50 X0 SET M51 SET M52 SET M53 M0 LDP LDP LDP LD 1 4 3 2 M2800 M2800 M2800 M2800 X0 SET M52 SET M50 SET M53 M2800 LDP LDP LDP LD 5 8 7 6 SET M51 M2800 to M3072 M0 to M2799 Turning ON X0 causes M0 to turn ON. • Contacts �, � and � are pulse con- tacts and activate for 1 scan. • Contact � is a normal LD contact and activates while M0 is ON. Turning ON X0 causes M2800 to turn ON. • Contact � is a pulse contact and acti- vates for 1 scan. • Contacts � and � are pulse contacts of the same M device as contact �. Contact � has already operated, so contact � and � do not operate. • Contact � is a normal LD contact and activates while M2800 is ON.

Devices in Detail 4 4-6 4.4 State Relays Device Mnemonic: S Purpose: Internal programmable controller status flag Alias: State (coil/ relay/ contact/ flag) S (coil/ relay/ contact /flag) STL step (coil/ relay/ contact /flag) Annunciator flag Available forms: NO (�) and NC contacts and output coils (�) (see example device usage for references) Devices numbered in: Decimal, i.e. S0 to S9, S10 to S19 Further uses: General stable state - state relays - see page 4-6 Battery backed/ latched state relays - see page 4-7 STL step relays - see page 4-8 Annunciator flags - see page 4-9 Example device usage: 4.4.1 General Stable State - State Relays A number of state relays are used in the PLC. The coils of these relays are driven by device contacts in the PLC in the same manner that the output relays are driven in the program. All state relays have a number of electronic NO and NC contacts which can be used by the PLC as required. Note that these contacts cannot directly drive an external load. Only output relays can be used to do this. FX1S FX1N FX2N FX2NC X0 X1 1 S20 2 S20 Available devices: • Please see the information point on page 4-7 ‘Battery backed/ latched state relays’, or see the relevant tables for the selected PLC in chapter 8.

Devices in Detail 4 4-7 4.4.2 Battery Backed/ Latched State Relays There are a number of battery backed or latched relays whose status is retained in battery backed or EEPROM memory. If a power failure should occur all output and general purpose relays are switched off. When operation is resumed the previous status of these relays is restored. Available devices: • For more information about device availability for individual PLC’s, see chapter 8. External loads: • State relays are provided with countless number of NO contact points and NC contact points, and are freely available for use through out a PLC program. These contacts cannot be used to directly drive external loads. All external loads should be driven through the use of direct (ex. Y) outputs. PLC FX1S FX1N FX2N FX2NC General state relays N/A N/A 500 (S0 - 499) Battery backed/ latched relays 128 (S0 - 127) 1000 (S0 - 999) 500 (S500 - 999) Total available 128 1000 1000

Devices in Detail 4 4-8 4.4.3 STL Step Relays States (S) are very important devices when programming step by step process control. They are used in combination with the basic instruction STL. When all STL style programming is used certain states have a pre-defined operation. The step identified as � in the figure opposite is called an ‘initial state’. All other state steps are then used to build up the full STL function plan. It should be remembered that even though remaining state steps are used in an STL format, they still retain their general or latched operation status. The range of available devices is as specified in the information point of the previous section. Assigned states: • When the applied instruction IST (Initial STate function 60) is used, the following state devices are automatically assigned operations which cannot be changed directly by a users program: S0 : Manual operation initial state S1 : Zero return initial state S2 : Automatic operation initial state S10 to S19 : Allocated for the creation of the zero return program sequence Monitoring STL programs: • To monitor the dynamic-active states within an STL program, special auxiliary relay M8047 must be driven ON. STL/SFC programming: • For more information on STL/SFC style programming, please see chapter 3. IST instruction: • For more information on the IST instruction please FNC 60 in Chapter 5. S2 X0 X1 X2 X3 1 S20 S21 S22 Y0 Y1 Y2

Devices in Detail 4 4-9 4.4.4 Annunciator Flags Some state flags can be used as outputs for external diagnosis (called annunciation) when certain applied instructions are used. These instructions are; ANS function 46: Annunciator Set - see page 5-61 ANR function 47: Annunciator Reset - see page 5-61 When the annunciator function is used the controlled state flags are in the range S900 to S999 (100 points). By programming an external diagnosis circuit as shown below, and monitoring special data register D8049, the lowest activated state from the annunciator range will be displayed. Each of the states can be assigned to signify an error or fault condition. As a fault occurs the associated state is driven ON. If more than one fault occurs simultaneously, the lowest fault number will be displayed. When the active fault is cleared the next lowest fault will then be processed. This means that for a correctly prioritized diagnostic system the most dangerous or damaging faults should activate the lowest state flags, from the annunciator range. All state flags used for the annunciator function fall in the range of battery backed/ latched state registers. Monitoring is enabled by driving special auxiliary relay M8049 ON. State S900 is activated if input X0 is not driven within one second after the output Y0 has been turned ON. State S901 is activated when both inputs X1 and X2 are OFF for more than two seconds. If the cycle time of the controlled machine is less than ten seconds, and input X3 stays ON, state S902 will be set ON if X4 is not activated within this machine cycle time. If any state from S900 to S999 is activated, i.e. ON, special auxiliary relay M8048 is activated to turn on failure indicator output Y10. The states activated by the users error / failure diagnosis detection program, are turned OFF by activating input X5. Each time X5 is activated, the active annunciator states are reset in ascending order of state numbers. FX1S FX1N FX2N FX2NC M8000 Y0 X0 K10 S900 T0 ANS X1 X2 K20 S901 T1 ANS X3 X4 K100 S902 T2 ANS FNC46 FNC46 FNC46 M8048 X5 ANR (P) FNC47 Y10 M8049

Devices in Detail 4 4-10 4.5 Pointers Device Mnemonic: P Purpose: Program flow control Alias: Pointer Program Pointer P Available forms: Label: appears on the left of the left hand bus bar when the program is viewed in ladder mode. Devices numbered in: Decimal, i.e. P0 to P9, P10 to P19 Further uses: Can be used with conditional jump statements (CJ function 00) - see page 5-5 and item � on the example device usage diagram. Can be used with call statements - see page 5-7 and item � on the example device usage diagram Example device usage: Available devices: • FX1S PLC’s have 64 pointers; available from the range of P0 to P63. • FX1N, FX2N and FX2NC PLC’s have 128 pointers; available from the range of P0 to P127. Jumping to the end of the program: • When using conditional jump instructions (CJ, function 00) the program end can be jumped to automatically by using the pointer P63 within the CJ instruction. Labelling the END instruction with P63 is not required. Device availability: • For more information about device availability for individual PLCs, please see chapter 8. FX1S FX1N FX2N FX2NC X20 CJ P0 1 P0 X20 CALL P1 2 P1 SRET FEND

Devices in Detail 4 4-11 4.6 Interrupt Pointers Device Mnemonic: I Purpose: Interrupt program marker Alias: Interrupt High speed interrupt I Available forms: Label: appears on the left of the left hand bus bar when the program is viewed in ladder mode (see � in the example device usage diagram). Devices numbered in: Special numbering system based on interrupt device used and input triggering method Further uses: Input interrupts - see page 4-12 Timer interrupts - see page 4-12 Disabling interrupts - see page 4-13 Counter interrupts - see page 4-13 Example device usage: Additional applied instructions: • Interrupts are made up of an interrupt device, an interrupt pointer and various usage of three, dedicated interrupt applied instructions; - IRET function 03: interrupt return - EI function 04: enable interrupt - DI function 05: disable interrupt Nested levels: • While an interrupt is processing all other interrupts are disabled. To achieve nested interrupts the EI-DI instruction must be programmed within an interrupt routine. Interrupts can be nested for two levels. Pointer position: • Interrupt pointers may only be used after an FEND instruction (first end instruction, function 06). FX1S FX1N FX2N FX2NC I101 IRET FEND 1 END

Devices in Detail 4 4-12 4.6.1 Input Interrupts Identification of interrupt pointer number: Example: I001 The sequence programmed after the label (indicated by the I001 pointer) is executed on the leading or rising edge of the input signal X0. The program sequence returns from the interruption program when an IRET instruction is encountered. Rules of use: • The following points must be followed for an interrupt to operate; - Interrupt pointers cannot have the same number in the ‘100s’ position, i.e. I100 and I101 are not allowed. - The input used for the interrupt device must not coincide with inputs already allocated for use by other high speed instructions within the user program. 4.6.2 Timer Interrupts Identification of interrupt pointer number: Example: I610 The sequence programmed after the label (indicated by the I610 pointer) is executed at intervals of 10msec. The program sequence returns from the interruption program when an IRET instruction is encountered. Rules of use: • The following points must be followed for an interrupt to operate; - Interrupt pointers cannot have the same number in the ‘100’s’ position, i.e. I610 and I650 are not allowed. I � 0 � 0: interrupt triggered on trailing/ falling edge of input signal 1: interrupt triggered on leading/ rising edge of input signal Input number; each input number can only be used once. FX1S has 4 points (0 to 3 which map to X0 to X3) Other units have 6 points (0 to 5 which map to X0 to X5) FX1S FX1N FX2N FX2NC I � � � 10 to 99 msec: the interrupt is repeatedly triggered at intervals of the specified time. Timer interrupt number 3 points (6 to 8)

Devices in Detail 4 4-13 4.6.3 Disabling Individual Interrupts Individual interrupt devices can be temporarily or permanently disabled by driving an associated special auxiliary relay. The relevant coils are identified in the tables of devices in chapter 6. However for all PLC types the head address is M8050, this will disable interrupt I0��. Driving special auxiliary relays: • Never drive a special auxiliary coil without first checking its use. Not all PLC’s assign the same use to the same auxiliary coils. Disabling high speed counter interrupts • These interrupts can only be disabled as a single group by driving M8059 ON. Further details about counter interrupts can be found in the following section. 4.6.4 Counter Interrupts Identification of interrupt pointer number: Example: The sequence programmed after the label (indicated by the I030 pointer) is executed once the value of High Speed Counter C255 reaches/equals the preset limit of K100 identified in the example HSCS. Additional notes: • Please see the following pages for more details on the HSSC applied instruction. - High Speed Counter Set, HSCS FNC 53. FX1S FX1N FX2N FX2NC I 0 � 0 Counter interrupt number 6 points (1 to 6). Counter interrupts can be entered as the output devices for High Speed Counter Set (HSCS, FNC 53). To disable the Counter Interrupts Special Auxiliary Relay M8059 must be set ON. M8000 DHSCS K100 C255 I030

Devices in Detail 4 4-14 4.7 Constant K Device Mnemonic: K Purpose: Identification of constant decimal values Alias: Constant K (value/ constant) K Available forms: Numeric data value, when used for 16bit data, values can be selected from the range -32,768 to +32,767 For 32bit data, values from the range -2,147,483,648 to + 2,147,483,647 can be used. Devices numbered in: N/A. This device is a method of local instruction data entry. There is no limit to the number of times it can be used. Further uses: K values can be used with timers, counters and applied instructions Example device usage: N/A 4.8 Constant H Device Mnemonic: H Purpose: Identification of constant hexadecimal values Alias: Constant H (value/ constant) Hex (value/ constant) H Available forms: Alpha-numeric data value, i.e. 0 to 9 and A to F (base 16). When used for 16bit data, values can be selected from the range 0 to FFFF. For 32bit data, values from the range 0 to FFFFFFFF can be used. Devices numbered in: N/A. This device is a method of local instruction data entry. There is no limit to the number of times it can be used. Further uses: Hex values can be used with applied instructions Example device usage: N/A FX1S FX1N FX2N FX2NC FX1S FX1N FX2N FX2NC

Devices in Detail 4 4-15 4.9 Timers Device Mnemonic: T Purpose: Timed durations Alias: Timer(s) T Available forms: A driven coil sets internal PLC contacts (NO and NC contacts available). Various timer resolutions are possible, from 1 to 100 msec, but availability and quantity vary from PLC to PLC. The following variations are also available:- Selectable timer resolutions - see page 4-16 Retentive timers - see page 4-17 Timers used in interrupt and ‘CALL’ subroutines - see page 4-18 Devices numbered in: Decimal, i.e T0 to T9, T10 to T19. Further uses: None Example device usage: Available devices: Selectable timers taken from the main range of 100 msec timers, see page 4-16. Timer accuracy: • See page 4-18. Timer Resolution FX1S FX1N FX2N FX2NC 100 msec 63 (T0 - 62) 200 (T0 - 199) 10 msec \ 31 (T32 - 62) 46 (T200 - 245) 1 msec 1 (T63) N/A Retentive 1 msec N/A 4 (T246 - 249) Retentive 100 msec N/A 6 (T250 - 255) FX1S FX1N FX2N FX2NC X0 T20 K123

Devices in Detail 4 4-16 4.9.1 General timer operation Timers operate by counting clock pulses (1, 10 and 100 msec). The timer output contact is activated when the count data reaches the value set by the constant K. The overall duration or elapsed time, for a timers operation cycle, is calculated by multiplying the present value by the timer resolution, i.e. A 10 msec timer with a present value of 567 has actually been operating for: 567× 10 msec 567× 0.01 sec = 5.67 seconds Timers can either be set directly by using the constant K to specify the maximum duration or indirectly by using the data stored in a data register (ex. D). For the indirect setting, data registers which are battery backed/ latched are usually used; this ensures no loss of data during power down situations. If however, the voltage of the battery used to perform the battery backed service, reduces excessively, timer malfunctions may occur. 4.9.2 Selectable Timers On certain programmable controllers, driving a special auxiliary coil redefines approximately half of the 100 msec timers as 10 msec resolution timers. The following PLC’s and timers are subject to this type of selection. - For FX1S, driving M8028 ON, timers T32 to 62 (31 points) are changed to 10 msec resolution. Driving special auxiliary coils: • Please check the definition of special auxiliary coils before using them. Not all PLC’s associate the same action to the same device. FX1S FX1N FX2N FX2NC

Devices in Detail 4 4-17 4.9.3 Retentive Timers A retentive timer has the ability to retain the currently reached present value even after the drive contact has been removed. This means that when the drive contact is re-established a retentive timer will continue from where it last reached. Because the retentive timer is not reset when the drive contact is removed, a forced reset must be used. The following diagram shows this in a graphical format. Using timers in interrupt or ‘CALL’ subroutines: • Please see page 4-18. Available devices: • Please see the information table on page 4-15. FX1S FX1N FX2N FX2NC X0 Y0 1.23 s t1 t2 X1 Y1 X2 t1 + t2 = 34.5s X0 T20 T20 K123 X1 T250 K345 X2 T250 RST Y0 Y1 T250 Present value Present value Non-retentive timer operation Retentive timer operation

Devices in Detail 4 4-18 4.9.4 Timers Used in Interrupt and ‘CALL’ Subroutines If timers T192 to T199 and T246 to T249 are used in a CALL subroutine or an interruption routine, the timing action is updated at the point when an END instruction is executed. The output contact is activated when a coil instruction or an END instruction is processed once the timers current value has reached the preset (maximum duration) value. Timers other than those specified above cannot function correctly within the specified circumstances. When an interrupt timer (1 msec resolution) is used in an interrupt routine or within a ‘CALL’ subroutine, the output contact is activated when the first coil instruction of that timer is executed after the timer has reached its preset (maximum duration) value. 4.9.5 Timer Accuracy Timer accuracy can be affected by the program configuration. That is to say, if a timer contact is used before its associated coil, then the timer accuracy is reduced. The following formulas give maximum and minimum errors for certain situations. However, an average expected error would be approximately; 1.5 × The program scan time Condition 1: The timer contact appears after the timer coil. Maximum timing error: 2 × Scan time + The input filter time Minimum timing error: Input filter time - The timer resolution Condition 2: The timer contact appears before the timer coil. Maximum timing error: 3 × Scan time + The input filter time Minimum timing error: Input filter time- The timer resolution Internal timer accuracy: • The actual accuracy of the timing elements within the PLC hardware is; ± 10 pulses per million pulses. This means that if a 100 msec timer is used to time a sin- gle day, at the end of that day the timer will be within 0.8 seconds of the true 24 hours or 86,400 seconds. The timer would have processed approximately 864,000; 100 msec pulses. FX1S FX1N FX2N FX2NC X10 T0 T0 Y10 X10 T0 Y10 T0

Devices in Detail 4 4-19 4.10 Counters Device Mnemonic: C Purpose: Event driven delays Alias: Counter(s) C Available forms: A driven coil sets internal PLC contacts (NO and NC contacts available). Various counter resolutions are possible including; General/latched 16bit up counters - see page 4-20 General/latched 32bit bi-directional counters - see page 4-21 (The availability and use of all these counters is PLC specific - please check availability before use) Devices numbered in: Decimal, i.e C0 to C9, C10 to C19 Further uses: None Example device usage: Available devices: High speed counters: • For high speed counters please see page 4-22. Setting ranges for counters: • 16bit and 32bit up counters:1 to +32,767 • 32bit bi-directional counters: -2,147,483,648 to +2,147,483,647 Counter Resolution FX1S FX1N FX2N FX2NC General 16bit up counter 16 (C0 - 15) 16 (C0 - 15) 100 (C0 - 99) Latched 16bit up counter 16 (C16 - 31) 184 (C16 - 199) 100 (C100 - 199) General 32bit bi-directional counter N/A 20 (C200 - 219) Latched 32bit bi-directional counter N/A 15 (C220 - 234) FX1S FX1N FX2N FX2NC X1 K345 X2 C12 RST C12

Devices in Detail 4 4-20 4.10.1 General/ Latched 16bit UP Counters The current value of the counter increases each time coil C0 is turned ON by X11. The output contact is activated when the coil is turned ON for the tenth time (see diagram). After this, the counter data remains unchanged when X11 is turned ON. The counter current value is reset to ‘0’ (zero) when the RST instruction is executed by turning ON X10 in the example. The output contact Y0 is also reset at the same time. Counters can be set directly using constant K or indirectly by using data stored in a data register (ex. D). In an indirect setting, the designation of D10 for example, which contains the value “123” has the same effect as a setting of “K123”. If a value greater than the counter setting is written to a current value register, the counter counts up when the next input is turned ON. This is true for all types of counters. Generally, the count input frequency should be around several cycles per second. Battery backed/latched counters: • Counters which are battery backed/ latched are able to retain their status information, even after the PLC has been powered down. This means on re-powering up, the latched counters can immediately resume from where they were at the time of the original PLC power down. Available devices: • Please see the information table on page 4-19. 0 1 2 3 4 5 6 7 8 9 10 X10 X11 Y0 X11 K10 X10 C0 RST C0 C0 Y0

Devices in Detail 4 4-21 4.10.2 General/ Latched 32bit Bi-directional Counters The counter shown in the example below, activates when its coil is driven, i.e. the C200 coil is driven. On every occasion the input X14 is turned from OFF to ON the current value or current count of C200 is incremented. The output coil of C200 is set ON when the current value increases from “-6” to “-5”. However, if the counters value decreases from “-5” to “-6” the counter coil will reset. The counters current value increases or decreases independently of the output contact state (ON/OFF). Yet, if a counter counts beyond +2,147,483,647 the current value will automatically change to -2,147,483,648. Similarly, counting below -2,147,483,648 will result in the current value changing to +2,147,483,647. This type of counting technique is typical for “ring counters”. The current value of the active counter can be rest to "0" (zero) by forcibly resetting the counter coil; in the example program by switching the input X13 ON which drives the RST instruction. The counting direction is designated with special auxiliary relays M8200 to M8234. Battery backed/ latched counters: • Counters which are battery backed/ latched are able to retain their status information, even after the PLC has been powered down. This means on re-powering up, the latched counters can immediately resume from where they were at the time of the original PLC power down. Available devices: • Please see the information table on page 4-19. Selecting the counting direction: • If M8��� for C��� is turned ON, the counter will be a down counter. Conversely, the counter is an up counter when M8��� is OFF. FX1S FX1N FX2N FX2NC X13 X14 0 1 2 3 4 5 3 2 1 0 4 -2 -3 -4 -5 -6 -1 -7 -8 -6 -5 -4 -3 -7 0 Y1 X12 X14 K-5 X13 C200 RST C200 X12 M8200 C200 Y1 If output is already turned ON Counters present value Up counting Down counting Up counting

Devices in Detail 4 4-22 4.11 High Speed Counters Device Mnemonic: C Purpose: High speed event driven delays Alias: Counter (s) C High speed counter (s) Phase counters Available forms: A driven coil sets internal PLC contacts (NO and NC contacts available). There are various types of high speed counter available but the quantity and function vary from PLC to PLC. Please check the following sections for device availability; FX1S and FX1N - see page 4-24 FX2N and FX2NC - see page 4-25 The following sections refer to counter types; 1 phase bi-directional counters (user start and reset) - see page 4-29 1 phase counters bi-directional (assigned start and reset) - see page 4-30 1 phase two input bi-directional counters - see page 4-31 A/B phase counters - see page 4-32 Devices numbered in: Decimal, i.e C235 to C255 Further uses: None Example device usage:For examples on each of the available forms please see the relevant sections. Basic high speed counter operation: • For information on basic high speed counters please see page 4-23. FX1S FX1N FX2N FX2NC

Devices in Detail 4 4-23 4.11.1 Basic High Speed Counter Operation Although counters C235 to C255 (21 points) are all high speed counters, they share the same range of high speed inputs. Therefore, if an input is already being used by a high speed counter, it cannot be used for any other high speed counters or for any other purpose, i.e as an interrupt input. The selection of high speed counters are not free, they are directly dependent on the type of counter required and which inputs are available. Available counter types; a) 1 phase bi-directional with user start/reset: C235 to C240 b) 1 phase bi-directional with assigned start/reset: C241 to C245 c) 1 phase two input bi-directional: C246 to C250 d) A/B phase type: C251 to C255 Please note ALL of these counters are 32bit devices. High speed counters operate by the principle of interrupts. This means they are event triggered and independent of cycle time. The coil of the selected counter should be driven continuously to indicate that this counter and its associated inputs are reserved and that other high speed processes must not coincide with them. Example: When X20 is ON, high speed counter C235 is selected. The counter C235 corresponds to count input X0. X20 is NOT the counted signal. This is the continuous drive mentioned earlier. X0 does not have to be included in the program. The input assignment is hardware related and cannot be changed by the user. When X20 is OFF, coil C235 is turned OFF and coil C236 is turned ON. Counter C236 has an assigned input of X1, again the input X20 is NOT the counted input. The assignment of counters and input devices is dependent upon the PLC selected. This is explained in the relevant, later sections. Driving high speed counter coils: • The counted inputs are NOT used to drive the high speed counter coils. This is because the counter coils need to be continuously driven ON to reserve the associated high speed inputs. Therefore, a normal non-high speed drive contact should be used to drive the high speed counter coil. Ideally the special auxiliary contact M8000 should be used. However, this is not compulsory. X20 K4789 X20 D4 C235 C236 X0 K4789 X1 D4 C235 C236

Devices in Detail 4 4-24 4.11.2 Availability of High Speed Counters The following device table outlines the range of available high speed counters. Key: U - up counter input D - down counter input R - reset counter (input) S - start counter (input) A - A phase counter input B - B phase counter input - Counter is backed up/latched Input assignment: • X6 and X7 are also high speed inputs, but function only as start signals. They cannot be used as the counted inputs for high speed counters. • Different types of counters can be used at the same time but their inputs must not coincide. For example, if counter C247 is used, then the following counters and instructions cannot be used; C235, C236, C237, C241, C242, C244, C245, C246, C249, C251, C252, C254, I0��, I1��, I2��. Counter Speeds: • General counting frequencies: - Single phase and bi-directional counters; up to 10 kHz. - A/B phase counters; up to 5 kHz. - Maximum total counting frequency (A/B phase counter count twice) FX1S & FX1N 60kHz, FX2N & FX2NC 20kHZ. • For FX2N & FX2NC Inputs X0 and X1 are equipped with special hardware that allows higher speed counting as follows: - Single phase or bi-directional counting (depending on unit) with C235, C236 or C246; up to 60 kHz. - Two phase counting with C251; up to 30 kHz. I N P U T 1 Phase counter user start/reset 1 Phase counter assigned start/reset 2 Phase counter bi-directional A/B Phase counter C235 C236 C237 C238 C239 C240 C241 C242 C243 C244 C245 C246 C247 C248 C249 C250 C251 C252 C253 C254 C255 X0 U/D U/D U/D U U U A A A X1 U/D R R D D D B B B X2 U/D U/D U/D R R R R X3 U/D R R U U A A X4 U/D U/D D D B B X5 U/D R R R R R X6 S S S X7 S S S FX1S FX1N FX2N FX2NC C235

Devices in Detail 4 4-25 If any high speed comparison instructions (FNC’s 53, 54, 55) are used, X0 and X1 must resort to software counting. In this case, please see the table below: Unit Function Number Max. Combined Signal Frequency FX2N & FX2NC 53 or 54 11 kHz 55 5.5 kHz FX1S & FX1N 53 or 54 30 kHz Calculating the maximum combined counting speed on FX1S: This is calculated as follows:(2 phase counter speed x number of counted edges) � (the sum of the speeds of the active 1 phase counters).

Devices in Detail 4 4-26 4.11.3 1 Phase Counters - User Start and Reset (C235 - C240) These counters only use one input each. When direction flag M8235 is ON, counter C235 counts down. When it is OFF, C235 counts up. When X11 is ON, C235 resets to 0 (zero). All contacts of the counter C235 are also reset. When X12 is ON, C235 is selected. From the previous counter tables, the corresponding counted input for C235 is X0. C235 therefore counts the number of times X0 switches from OFF to ON. Device specification: • All of these counters are 32bit up/down ring counters. Their counting and contact operations are the same as normal 32bit up/down counters described on page 4-21. When the counters current value reaches its maximum or setting value, the counters associated contacts are set and held when the counter is counting upwards. However, when the counter is counting downwards the contacts are reset. Setting range: • -2,147,483,648 to +2,147,483,647 Direction setting: • The counting direction for 1 phase counters is dependent on their corresponding flag M8���; where ��� is the number of the corresponding counter, (C235 to C240). When M8��� is ON the counter counts down, When M8��� is OFF the counter counts up. Using the SPD instruction: • Care should be taken when using the SPD applied instruction (FNC 56). This instruction has both high speed counter and interrupt characteristics, therefore input devices X0 through X5 may be used as the source device for the SPD instruction. In common with all high speed processes the selected source device of the SPD instruction must not coincide with any other high speed function which is operating, i.e. high speed counters or interrupts using the same input. When the SPD instruction is used it is considered by the system to be a 1 phase high speed counter. This should be taken into account when summing the maximum com- bined input signal frequencies - see the previous section. X12 K1234 C235 RST X10 X11 M8235 C235

Devices in Detail 4 4-27 4.11.4 1 Phase Counters - Assigned Start and Reset (C241 to C245) These counters have one countable input and 1 reset input each. Counters C244 and C245 also have a start input. When the direction flag M8245 is ON, C245 counts down. When it is OFF C245 will count up. When X14 is ON, C245 resets in the same manner as normal internal 32bit counters, but C245 can also be reset by input X3. This is assigned automatically when counter C245 is used (see previous counter tables). Counter C245 also has an external start contact, again automatically assigned. This is actually input X7. Once again this data can be found on the previous counter tables. When X7 is ON, C245 starts counting, conversely when X7 is OFF C245 stops counting. The input X15 selects and reserves the assigned inputs for the selected counter, i.e. in this case C245. The reason why these counters use assigned start (X7) and reset (X3) inputs is because they are not affected by the cycle (scan) time of the program. This means their operation is immediate and direct. In this example C245 actual counts the number of OFF to ON events of input X2. Note: Because C245 is a 32bit counter, its setting data, specified here by a data register also has to be of a 32bit format. This means that data registers D1 and D0 are used as a pair to provide the 32bit data format required. Device specification: • All of these counters are 32bit up/down ring counters. Their counting and contact operations are the same as normal 32bit up/down counters described on page 4-21. When the counters current value reaches its maximum or setting value, the counters associated contacts are set and held when the counter is counting upwards. However, when the counter is counting downwards the contacts are reset. Setting range: • -2,147,483,648 to +2,147,483,647 Direction setting: • The counting direction for 1 phase counters is dependent on their corresponding flag M8���; where ��� is the number of the corresponding counter, (C241 to C245). - When M8��� is ON the counter counts down. - When M8��� is OFF the counter counts up. X15 D0 C245 RST X13 X14 M8245 C245

Devices in Detail 4 4-28 4.11.5 2 Phase Bi-directional Counters (C246 to C250) These counters have one input for counting up and one input for counting down. Certain counters also have reset and start inputs as well. When X10 is ON, C246 resets in the same way as standard 32bit counters. Counter C246 uses inputs; X0 to count up and X1 to count down For any counting to take place the drive input X11 must be ON to set and reserve the assigned inputs for the attached counter, i.e. C246. Note: X0 moving from OFF to ON will increment C246 by one X1 moving from ON to OFF will decrement C246 by one Bi-directional counter C250 can be seen to have X5 as its reset input and X7 as its start input. Therefore, a reset operation can be made externally without the need for the RST C250 instruction. X13 must be ON to select C250. But start input X7 must be ON to allow C250 to actually count. If X7 goes OFF counting ceases. Counter C250 uses input X3 to count up and input X4 to count down. Device size: • All of these counters have 32bit operation. Setting range: • -2,147,483,648 to +2,147,483,647 Direction setting: • The counting direction for 1 phase counters is dependent on their corresponding flag M8���; where ��� is the number of the corresponding counter, (C241 to C245). - When M8��� is ON the counter counts down, - When M8��� is OFF the counter counts up. X11 D2 C246 RST X10 C246 X13 K1234 C250