TON

 Function Block - On timer.

• The timer starts on a rising pulse of IN input.
  • It stops when the elapsed time is equal to the programmed time.
• A falling pulse of IN input resets the timer to 0 (zero).
• The output signal is set to TRUE when programmed time is elapsed.
  • It is reset to FALSE when the input command falls.

Inputs

Input	Data Type See Data Types.	Range	Unit	Default	Description
IN	BOOL	FALSE, TRUE			Timer command.
PT	TIME	Time Units			Programmed time.

Outputs

Output	Data Type See Data Types.	Range	Unit	Description
Q	BOOL	FALSE, TRUE		Timer elapsed output signal.
ET	TIME	Time Units		Elapsed time.

Time Diagram

Figure 1: Time Diagram

FBD Language Example

FFLD Language Example

• In the FFLD Language, the input rung is the IN command.
  • The output rung is Q the output signal.

IL Language Example

Not available.

ST Language Example

MyTimer is a declared instance of TON function block.
MyTimer (IN, PT);
Q := MyTimer.Q;
ET := MyTimer.ET;

See Also

• blink
• TOF / TOFR
• TP / TPR