F_TRIG

The function block F_TRIG is a detector for a falling edge.

Inputs

VAR_INPUT
    CLK : BOOL; (* Signal to detect *)
END_VAR

Name	Type	Description
CLK	BOOL	Signal to detect

VAR_OUTPUT
    Q : BOOL; (* Edge detected *)
END_VAR

Name	Type	Description
Q	BOOL	As long as the input variable CLK = TRUE, the output will be Q = FALSE. As soon as CLK = FALSE, Q = TRUE. This means that each time the function is called, Q returns FALSE until CLK has a rising edge and then a falling edge.

Development environment	Target platform	PLC library to include
TwinCAT v3.0.0	PC or CX (x86)	Tc2_Standard