Stairway Lighting Switch - Siemens LOGO! Manual

4.4.9

Stairway lighting switch

Short description
An input edge triggers a configurable and retriggerable time. The output is reset after this
time has expired. A warning signal can be output before this time has expired to warn of the
impending shutdown.
Symbol in LOGO!
Parameter T, T and T
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Note the defaults of the T parameters listed in topic Time response (Page 115).
The off-delay time T, the pre-warning time T
by the actual value of another already-programmed function. You can use the actual values
of the following functions:
● Analog comparator (Page 165) (actual value Ax – Ay)
● Analog threshold trigger (Page 160) (actual value Ax)
● Analog amplifier (Page 173) (actual value Ax)
● Analog multiplexer (Page 194) (actual value AQ)
● Analog ramp (Page 197) (actual value AQ)
● Analog math (Page 209) (actual value AQ)
● PI controller (Page 201) (actual value AQ)
● Up/down counter (Page 151) (actual value Cnt)
Select the required function by the block number. The timebase is configurable. For
information on valid ranges and parameter defaults, refer to the On-delay (Page 123) topic.
LOGO!
Manual, 10/2017, A5E01248535-AA
Wiring
Input Trg
Parameter
Output Q
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4.4 Special functions list - SF
Description
A signal at input Trg (Trigger) triggers the off-delay
time for the stairway lighting switch.
T represents the off-delay time of the output (output
signal transition 1 to 0).
T determines the triggering time for the pre-warning.
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T determines the length of the pre-warning signal.
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Retentivity:
/ = No retentivity
R = The status is retentive.
Q is reset after the time T has expired. A warning
signal can be output before this time has expired.
and the pre-warning period T
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LOGO! functions
can be provided
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