Chapter 23 Timer instructions
622 Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
TON increases an internal timer up to a given value.
TON operation
• Do not use a jump to skip over a TON function block in a Ladder Diagram
(LD). If you do, the TON timer will continue after the elapsed time.
• For example: Rung 1 contains a jump; rung 2 contains a TON function
block with an elapsed time of 10 seconds; enable the jump from rung 1 to
rung 3; disable the jump after 30 seconds; the elapsed time will be 30
seconds - not 10 seconds as defined in the elapsed time.
Arguments
Parameter Parameter type Data type Description
IN Input BOOL If rising edge, starts increasing internal timer.
If falling edge, stops and resets internal timer.
PT Input TIME Maximum programmed time.
Q Output BOOL If TRUE, programmed time is elapsed.
ET Output TIME Current elapsed time. Possible values range from 0ms to
1193h2m47s294ms.
Tip:
If you use the EN parameter with this block, the timer starts incrementing
when EN is set to TRUE, and continues to increment even if EN is set to
FALSE.
TON timing diagram
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