7.3.3 TOF_TIME

Function

TOF_TIME is called the standard disconnection delay timer, which is used to delay a certain period of time after IN is disconnected

LD graphics

• Disconnect delay timer timing diagram:

Parameter description

Interface variable	Declaration	Data type	Description
IN	Var_Input	BOOL	Start input bit
PT	Var_Input	TIME	Set time input
Q	Var_Output	BOOL	Output bit
ET	Var_Output	TIME	Elapsed time

Corresponding syntax

• When the IN value is "TRUE", the Q value output is "TRUE"
• When the IN value changes from "TRUE" to "FALSE", the timer starts
• At any time, as long as the IN value changes to "TRUE", ET stops timing and returns to 0
• When the ET value is equal to the PT value, the Q value output is "FALSE"

Don’t forget the definition

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:

TOF_TIME_1(
    IN:=IN1,
    PT:=T#1s,
    Q=>OUT,
    ET=>ET
);
IF OUT THEN
    iVar:=iVar+1;
    else
    iVar:=0;
END_IF;