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TON

Function BlockA function block groups an algorithm and a set of private data. It has inputs and outputs. - On timer.

Inputs

IN : BOOL  Timer command
PT : TIME  Programmed time

Outputs

Q : BOOL   Timer elapsed output signal
ET : TIME  Elapsed time

Time diagram

Remarks

• 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. The output signal is set to TRUE when programmed time is elapsed, and reset to FALSE when the input command falls.
• In FFLD language, the input rung is the IN command. The output rung is Q the output signal.

ST Language

(* Inst_TON is a declared instance of TON function block *)
Inst_TON( FALSE, T#2s );
Q := Inst_TON.Q;
ET := Inst_TON.ET;

FBD Language

FFLD Language

IL Language:

(* MyTimer is a declared instance of TON function block *)
Op1: CAL MyTimer (IN, PT)
     FFLD  MyTimer.Q
     ST  Q
     FFLD  MyTimer.ET
     ST  ET

See also

TOF   TP   BLINK

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