LCTD (FB)

FUNCTION_BLOCK PUBLIC LCTD

Decrements a given value

(* Example declaration *)
LCTDInst : LCTD ;

(* Example in ST *)
LCTDInst(CD:= VarBOOL1, LOAD:=VarBOOL2 , PV:= VarLWORD1);
VarBOOL3 := CTDInst.Q ;
VarLWORD2 := CTDInst.CV;

InOut:

Scope	Name	Type	Comment
Input	CD	BOOL	Rising edge: Decrementing CV by one
	LOAD	BOOL	TRUE: Set CV to the start value PV
	PV	LWORD	Start value for decrementing
Output	Q	BOOL	TRUE if CV = 0
	CV	LWORD	Current counter value