F_TRIG
![F_TRIG 1:](Images/png/74429323__Web.png)
Detector for a Falling Edge
VAR_INPUT
VAR_INPUT
CLK : BOOL; (* Signal to detect *)
END_VAR
VAR_OUTPUT
VAR_OUTPUT
Q : BOOL; (* Edge detected *)
END_VAR
The output Q will remain FALSE as long as the input variable CLK returns TRUE. As soon as CLK returns FALSE, Q will return TRUE. This means each time the function is called up, Q will return FALSE until CLK has a rising followed by a falling edge.
Requirements
Development environment |
Target system type |
PLC libraries to be linked |
---|---|---|
TwinCAT v3.0.0 |
PC or CX (x86) |
Tc2_Standard |