TON on-delay timer symbol
Also called TON, On delay timer, Timer on delay
An on-delay timer: when IN goes true it starts timing, and Q goes true once the elapsed time ET reaches the preset PT. When IN goes false, Q and ET reset. Allen-Bradley TON is the same idea, with a preset and an accumulated value.
IEC 61131-3What the TON on-delay timer symbol means
An on-delay timer: when IN goes true it starts timing, and Q goes true once the elapsed time ET reaches the preset PT. When IN goes false, Q and ET reset. Allen-Bradley TON is the same idea, with a preset and an accumulated value.
How it is drawn
TON function block. A box marked TON with inputs IN and PT and outputs Q and ET.
LD SVGWhere you see it
Delays before acting: a motor run confirmation, a valve travel time, a debounce on an input.
Related symbols
Frequently asked questions
What does the TON on-delay timer symbol look like?
A box marked TON with inputs IN and PT and outputs Q and ET.
Where is a TON on-delay timer used?
Delays before acting: a motor run confirmation, a valve travel time, a debounce on an input.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016