7.2.1 CTU_DINT

Function

CTU_DINT is called an up 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 counter input
PV	Var_Input	DINT	Preset value
R	Var_Input	BOOL	Reset input, CV clear
Q	Var_Output	BOOL	Counter status, output bit
CV	Var_Output	DINT	The value of the current count

Corresponding syntax

• Counting range: -2147483648~2147483647
• For the rest, refer to the CTU_INT parameter syntax

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:

CTU_DINT_1(
    CU:=UP,
    R:=RESET,
    PV:=1,
    Q=>OUT,
    CV=>cVar
);
IF OUT THEN
    iVar:=1;
    ELSE
        iVar:=0;
END_IF;