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Standard function blocks
324
02/16 MN05013001Z EN
Timing relay, off-delayed with and without random
switching
Random switching, with and without retriggering
The contact of the timing relay switches randomly within the
setpoint value range.
Retriggering
When the time is running and the trigger coil is reactivated
or deactivated, the actual value is reset to zero. The set time
of the timing relay is timed out once more.
Figure 157: Signal diagram of timing relay, off delayed
(with/without random switching, with/without
retriggering)
1: Trigger coil T…EN
2: Stop coil T…ST
3: Reset coil T…RE
4: Switching contact (N/O contact) T…Q1
t
s
: Setpoint time
• Range A: The time elapses after the trigger coil is deactivated.
• Range B: The Stop coil stops the time from elapsing.
• Range C: The reset coil resets the relay and the contact. After the
reset coil drops out, the relay continues to work normally.
• Range D: The Reset coil resets the relay and the contact when the
function block is timing out.
A
B
t
1
+
t
2
=
t
s
t
s
C
1
2
4
3
t
s
D
t
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