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SIMATIC Off-Delay Timer The
SIMATIC Off-Delay Timer (TOF) begins timing when input
(TOF) (IN) turns off. In the following example, when contact I1.4
closes, the current value of timer T33 is set to 0, timer bit T33
turns on immediately, closing the T33 contact, and turning on
output Q2.3.
When contact I1.4 opens, the timer times until the preset time
elapses, 200 ms in this example. Then, timer bit T33 turns off,
contact T33 opens, and output Q2.3 turns off.
If the I1.4 contact had closed again before the 200 ms preset
time had elapsed, the timer’s current value would again be set
to 0, timer bit T33 would remain on, contact T33 would remain
closed, and output Q2.3 would remain on.
T33
+20
I1.4
Q2.3
TOF
T33
IN
PT
10 ms
Preset time = 20 x 10 ms = 200 ms
Network 1
Network 2
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