Chapter 9—C445 Logic Engine and Expansion I/O
184 Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com
TON—On-Delay Timer
The TON function block is an on-delay timer that delays a FALSE to TRUE transition of IN
to OUT by a time defined by PT. When IN is FALSE, OUT will be set to FALSE and the
elapsed time (ET) will be set to zero. When IN transitions to TRUE, the timer starts running
and updates the ET live. Once the timer reaches the PT, the timer stops running and sets
the OUT to TRUE. If the IN transitions to FALSE before the ET could reach PT, the timer is
stopped and ET is set to 0.
Parameter Data type Description
IN BOOL Input trigger to start timer—rising edge
PT UINT Preset time (x1ms, x10ms, 100ms, x1s)
OUT BOOL Timer expired flag—active high
ET UINT Elapsed time (x1ms, x10ms, 100ms, x1s)
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