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Standard function blocks
326
02/16 MN05013001Z EN
Timing relay, on delayed and off delayed with and
without random switching
Time value >I1: On delay time
Time value >I2: Off delay time
Random switching
The contact of the timing relay switches randomly within the
setpoint value ranges.
Figure 159: Operational diagrams timing relay, on and off delayed
1
1: Trigger coil T…EN
2: Stop coil T…ST
3: Reset coil T…RE
4: Switching contact (N/O contact) T…Q1
t
s1
: Pick-up time
t
s2
: drop-out time
• Range A: The relay processes the two times without any
interruption.
• Range B: The trigger coil drops out before the on-delay is
reached.
• Range C: The stop coil stops the timeout of the on-delay.
• Range D: The stop coil has no effect in this range.
A
B
C
1
2
4
3
D
t
t
s1
t
s2
t
s2
t
s1
t
s2
t
1
+
t
2
=
t
s1
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