TON

Timer with switch-on delay

The function block TON allows you to program a switch-on delay.

Parameters

Input

IN (BOOL)

timer ON

an internal timer is started for each rising edge detected at IN

PT (TIME)

switch-on delay (PT = preset time)

16-bit value: 0–327.27s

32-bit value: 0–21,474,836.47s (32-bit value not available for FP3, FPC, FP5, FP10/10S)

resolution 10ms each

Output

Q (BOOL)

signal output

set to TRUE if PT = ET

ET (TIME)

elapsed time

indicates the current value of the elapsed time

The value can be changed during counting operation by writing to the variable from the programming editor.

Remarks

Q is set delayed with the time defined in PT. Resetting is without any delay.
If the input IN is only set for the period of the delay time PT or even for a shorter period of time (t3 - t2 < PT), Q will not be set.

Time chart

Example

POU header

All input and output variables used for programming this function have been declared in the POU header.The same POU header is used for all programming languages.

	VAR
		copy_name: TON;
		start: BOOL:=FALSE;
		set_value: TIME:=T#0s;
		signal_output: BOOL:=FALSE;
		current_value: TIME:=T#0s;
	END_VAR

POU body

If start is set (status = TRUE), the input signal is transferred to signal_output with a delay by the time period set_value.

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 6 ;
        NETWORK_BODY
B(B_CONTACT,,start,3,2,5,4,);
B(B_VARIN,,set_value,7,3,9,5,);
B(B_VAROUT,,current_value,14,3,16,5,);
B(B_COIL,,signal_output,21,2,23,4,);
B(B_FB,TON!,copy_name,9,1,14,5,,?BIN?BPT?AQ?AET);
L(1,3,3,3);
L(1,0,1,6);
L(5,3,9,3);
L(14,3,21,3);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

copy_name( IN:= start ,
        PT:= set_value ,
        Q=> signal_output ,
        ET=> current_value );

IL body

If you want to call the function block in an instruction list, enter the following:

Example with emergency stop and initializing the preset time

POU header

All input and output variables used for programming this function have been declared in the POU header.The same POU header is used for all programming languages.

	VAR
		TOF1: TOF;
		tPT: TIME:=T#10s;
		tET: TIME:=T#0s;
		bIN: BOOL:=FALSE;
		bQ: BOOL:=FALSE;
		bEmergencyStop: BOOL:=FALSE;
	END_VAR

POU body

After a falling edge at bIN, the timer starts counting and Q is set to TRUE. When bEmergencyStop is set to TRUE before the timer value has been elapsed, counting stops and the output Q is immediatiely reset. The timer is initialized with the preset time PT of 10s in this example.

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 4 ;
        NETWORK_BODY
B(B_F,E_MOVE!,,16,0,22,4,,?DEN?D?AENO?C);
B(B_VARIN,,tPT,14,2,16,4,);
B(B_VAROUT,,TOF1.ET,22,2,24,4,);
B(B_CONTACT,,bIN,11,1,13,3,N);
B(B_CONTACT,,bEmergencyStop,6,1,8,3,);
L(1,2,6,2);
L(13,2,16,2);
L(8,2,11,2);
L(1,0,1,4);
        END_NETWORK_BODY
    END_NET_WORK
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 5 ;
        NETWORK_BODY
B(B_FB,TOF!,TOF1,16,1,21,5,,?BIN?BPT?AQ?AET);
B(B_VARIN,,tPT,14,3,16,5,);
B(B_VAROUT,,tET,21,3,23,5,);
B(B_CONTACT,,bIN,6,2,8,4,);
B(B_COIL,,bQ,34,2,36,4,);
B(B_CONTACT,,bEmergencyStop,27,2,29,4,N);
L(21,3,27,3);
L(29,3,34,3);
L(8,3,16,3);
L(1,3,6,3);
L(1,0,1,5);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

if (bEmergencyStop AND NOT bIN) then
    TOF1.ET:=tPT;
end_if;
TOF1(IN := bIN, PT := tPT, ET => tET);
bQ := NOT bEmergencyStop AND TOF1.Q;