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Standard function blocks
322
02/16 MN05013001Z EN
Timing relay, on-delayed with and without random
switching
Random switching:
The contact of the timing relay switches randomly within the
setpoint value range.
Figure 155: Signal diagram of timing relay, on-delayed
(with and without random switching)
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 runs down from the set time value.
• Range B: The time does not elapse because the trigger coil drops
out prematurely.
• Range C: The Stop coil stops the time from elapsing.
t
1
+
t
2
=
t
s
t
A
B
t
s
1
2
4
3
C
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