Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 656)

L-force | PLC Designer
PLC Designer Libraries
654 DMS 3.2 EN 02/2011 TD29

QD returns TRUE when CV has become equal to 0.
Declaration example:
CTUDInst : CUTD ;
Example in IL:
CAL CTUDInst(CU:=VarBOOL1, RESET:=VarBOOL3, LOAD:=VarBOOL4,
PV:=VarINT1)
LD CTUDInst.Q
ST VarBOOL5
LD CTUDInst.QD
ST VarBOOL5
LD CTUInst.CV
ST VarINT2
Example in FBD:
Example in ST:
CTUDInst(CU := VarBOOL1, RESET := VarBOOL3, LOAD:=VarBOOL4 ,
PV:= VarINT1);
VarBOOL5 := CTUDInst.QU ;
VarBOOL6 := CTUDInst.QD ;
VarINT2 := CTUDInst.CV;