CTD

PROGRAM CTD_DEMO
    VAR
     BOOL1,BOOL2,BOOL3: BOOL;
    INT1,INT2: INT;
     FB:CTD;
    END_VAR
    FB(CD:=BOOL1,LD:=BOOL2,PV:=INT1,Q=>BOOL3,CV=>INT2);
END_PROGRAM

Description

The block acts as a counter counting down to zero from the preset value pv.

Input	Type	Description	Default value
CD	BOOL	Rising edge counts one down	False
LD	BOOL	Sets the counter to its initial value pv	False
PV	INT	Initial value of the counter	0

Output	Type	Description
Q	BOOL	State when the counter finished counting (counting finished: q=true).
CV	INT	Current value of the counter

CTD

Block name

ST call

Description

Inputs

Outputs

Application example