Stairwell Light Switch - Siemens LOGO! 24RC Manual

LOGO! Functions

4.4.19 Stairwell Light Switch

Brief description
Following an input pulse (edge-controlled), a parameteriz-
able timed period starts. The output is reset when the de-
fined period has elapsed. 15 s before the time has elapsed,
an off warning is issued.
Symbol in
LOGO!
Parameter T
Please refer to the note in Section 4.3.2 when specifying
the values.
Timing diagram
Trg
Q
T starts
a
122
Connection
Input Trg
Parameter T
Output Q
T
Warning duration
Description
Use the Trg (trigger) input to
start the time for the stair-
well light switch (off delay).
T is the time after which the
output is switched off (out-
put state changes from 1
to 0).
Minutes are set as the de-
fault time base.
Q is switched off when the
time T has elapsed. 15 s be-
fore the time has elapsed,
the output switches to 0 for
1 s.
1s
15s
Warning time
LOGO! Manual
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