Mitsubishi Electric MELSEC iQ-F Series Programming Manual

8.2 Structure Normal step (without attribute) A basic step used to configure a block. While this type of step is active, the transition condition following the step is constantly checked, and when the transition becomes TRUE, the next step becomes active. The output status of the action of a step at a transition to the next step varies depending on the instruction used. ■Step without action A step without an action can also be used as a waiting step. • While a step is active, the transition is always checked and, when the transition becomes TRUE, the next step becomes a ...

3.3 Function Blocks (FB) 25 3 EN and ENO In the same way as a function, EN (enable input) and ENO (enable output) can also be appended to a function block to control execution processing. Page 14 EN and ENO When the instance of a function to which EN/ENO has been appended is called, an actual argument must be assigned to EN. Creating programs The program of a function block can be created by using the engineering tool. [Navigation window]  [FB/FUN]  Right-click  [Add New Data] Select "Function Block" for "Data Type" in "Basic Setting". The created pro ...

8.2 Structure 81 8 Block start step (without END check) [BS] Block start step (without END check) [BS] is a step that activates the specified block. When the transition becomes TRUE, the active state transitions to the next step. The operation to be performed if multiple attempts to start one block are performed simultaneously or if an attempt to start an already started block is performed depends on "Act at block Multi-Activated." (Page 100 Act at block Multi-Activated) Only one block can be specified. To start multiple blocks simultaneously, use parallel branches and multi ...

3.3 Function Blocks (FB) 21 3 Instances ■Instances An instance is a label assigned to realize a function block definition. Multiple instances can be created from one function block definition. An instance consists of the following items. Ex. Structure of instance (Example of subroutine type function block) For the local label area and local latch label area, since the label area is secured in units of four words, three-words (padding size) are secured in the above example. Each area occupies a reserved area. The reserved area is used to add or change the local ...