Chapter 9—C445 Logic Engine and Expansion I/O
Power Xpert C445 Global Motor Management Relay
MN042003EN—January 2019
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TOF—Off-Delay Timer
The TOF function block is an off-delay timer that delays a TRUE to FALSE transition of IN
to OUT by a time defined by PT. When IN is TRUE, OUT will be set to TRUE and the
elapsed time (ET) will be set to zero. When IN transitions to FALSE, the timer starts
running and updates the ET live. Once the timer reaches the PT, the timer stops running
and sets the OUT to FALSE. If the IN transitions to TRUE 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—falling edge
PT
UINT
Preset time (x1ms, x10ms, 100ms, x1s)
OUT
BOOL
Timer expired flag—active low
ET
UINT
Elapsed time (x1ms, x10ms, 100ms, x1s)