CTUD

PROGRAM CTUD_DEMO
   VAR
     BOOL1,BOOL2,BOOL3,BOOL4,BOOL5,BOOL6: BOOL;
  INT1,INT2: INT;
     FB:CTUD;
   END_VAR
    FB(CU:=BOOL1,CD:=BOOL2,R:=BOOL3,LD:=BOOL4,PV:=INT1,QU=>BOOL5,QD=>BOOL6,CV=>INT2);
END_PROGRAM

Description

The block is an up and down counter. If both r and ld are true, r has higher priority.

Input	Type	Description	Default value
CU	BOOL	Adds 1 on rising edge	False
CD	BOOL	Subtracts 1 on rising edge	False
R	BOOL	Reset to zero	False
LD	BOOL	Sets the counter to the maximum value	False
PV	INT	Maximum counter value	0

Output	Type	Description
QU	BOOL	Status when the counter reaches its maximum value
QD	BOOL	Status when the counter is zero
CV	INT	Current counter value

CTUD

Block name

ST call

Description

Inputs

Outputs

Application example