Calling Functions from Transitions
Any function written in Structured Text (ST), Ladder Diagram (LD), Function Block Diagram (FBD), or a "C" function can be called to evaluate the condition attached to a transition, according to this syntax in ST:
< function > ( ) ;
The value returned by the function must be Boolean and yield the resulting condition:
Value | Condition |
|---|---|
return value = FALSE | condition is FALSE |
return value = TRUE | condition is TRUE |
Example
(* SFC program with function call for transitions *)
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