FB_BA_RFTrig

Function block for the detection of a rising or falling edge on a Boolean variable. The use of the separate function blocks R_TRIG and F_TRIG can be avoided with the block.

VAR_INPUT

bValue    : BOOL;

bValue: Value to be monitored.

VAR_OUTPUT

Q        : BOOL;
Qr       : BOOL;
Qf       : BOOL;

Q: TRUE if an edge is detected.

Qr: Result of the last comparison (TRUE as soon as the monitored value changes from FALSE to TRUE).

Qf: Result of the last comparison (TRUE as soon as the monitored value changes from TRUE to FALSE).

Requirements