Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 651)

L-force | PLC Designer
PLC Designer Libraries

DMS 3.2 EN 02/2011 TD29 649
19.1.3 Trigger...
R_TRIG
Provided by standard.lib.
The function block R_TRIG detects a rising edge.
FUNCTION_BLOCK R_TRIG
VAR_INPUT
CLK : BOOL;
END_VAR
VAR_OUTPUT
Q : BOOL;
END_VAR
VAR
M : BOOL := FALSE;
END_VAR
Q := CLK AND NOT M;
M := CLK;
The output Q and the help variable M will remain FALSE as long as the input variable
CLK is FALSE. As soon as CLK returns TRUE, Q will first return TRUE, then M will be set
to TRUE. This means each time the function is called up, Q will return FALSE until CLK
has falling edge followed by an rising edge.
Declaration example:
RTRIGInst : R_TRIG ;
Example in IL:
CAL RTRIGInst(CLK := VarBOOL1)
LD RTRIGInst.Q
ST VarBOOL2