7.2.5 CTUD_DINT

Function

CTDU_DINT is called an up-down counter, used to accumulate the number of input pulses (0->1 or 1->0) at the input end.

LD graphics

Parameter description

Interface variables	Declaration	Data type	Description
CU	Var_Input	BOOL	Up-count signal input terminal
CD	Var_Input	BOOL	Countdown signal input terminal
R	Var_Input	BOOL	Reset input, CV clear
LD	Var_Input	BOOL	Load preset value, set CV to PV
PV	Var_Input	DINT	Preset value
QU	Var_Output	BOOL	Add counter status
QD	Var_Output	BOOL	Status of the down counter
CV	Var_Output	DINT	The value of the current count

Corresponding syntax

• Counting range: -2147483648~2147483647
• The rest of the syntax refers to CTUD_INT
• Function block example:

warning

Function block usage requires global declaration of an instance

Example

• LD example is shown in the following animation:

• ST example is shown in the following code:

CTUD_DINT_1(
    CU:=UP,
    CD:=DOWN,
    R:=RESET,
    LD:=LOAD,
    PV:=1,
    QU=>OUT,
    QD=>OUT2,
    CV=>cVar
);
IF OUT THEN
    IVar:=iVar+1;
    ELSE
        iVar:=0;
END_IF;
IF OUT2 THEN
    iVar2:=iVar2+1;
    else
    iVar2:=0;
END_IF;