Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 655)

L-force | PLC Designer
PLC Designer Libraries

DMS 3.2 EN 02/2011 TD29 653
Declaration example:
CTDInst : CTD ;
Example in IL:
CAL CTDInst(CD := VarBOOL1, LOAD := VarBOOL2, PV :=
VarINT1)
LD CTDInst.Q
ST VarBOOL3
LD CTDInst.CV
ST VarINT2
Example in FBD:
Example in ST:
CTDInst(CD:= VarBOOL1, LOAD:=VarBOOL2 , PV:= VarINT1);
VarBOOL3 := CTDInst.Q ;
VarINT2 := CTDInst.CV;
CTUD
Provided by standard.lib.
Function Block Incrementer/Decrementer
The input variables CU, CD, RESET, LOAD as well as the output variables QU and QD
are type BOOL, PV and CV are type WORD.
If RESET is valid, the counter variable CV will be initialized with 0. If LOAD is valid, CV
will be initialized with PV.
If CU has a rising edge from FALSE to TRUE, CV will be raised by 1. If CD has a rising
edge from FALSE to TRUE, CV will be lowered by 1 provided this does not cause the
value to fall below 0.
QU returns TRUE when CV has become greater than or equal to PV.