Table of Contents

FallingTrigger

Namespace
ZCore
Implements
FUNCTION_BLOCK FallingTrigger IMPLEMENTS ZCore.ITrigger

This function block can be used to check if a variable changed from TRUE to FALSE by providing it to the method (Trigger)[xref:ZCore.FallingTrigger#Trigger]. If that happens, the trigger method returns TRUE for exactly one call. The function block implements the same behavior as F_TRIG.

Methods

HasTriggered 

METHOD HasTriggered () : BOOL

returns TRUE if the last call to Trigger returned TRUE as well

Returns

BOOL

Trigger 

METHOD Trigger (
 [input] input : BOOL) : BOOL

Returns TRUE if input changed from TRUE to FALSE in consecutive calls to this method.

IF falling.Trigger(_io.IsActive())
THEN
  ;(* do something *);
END_IF

Inputs

input BOOL

variable or output of a function/function block which should be observed to a falling trigger

Returns

BOOL