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Stairway Lighting Switch - Siemens LOGO! Series Manual

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Table of Contents
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
!
Note the defaults of the T parameters listed in topic Time response (Page 151).
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 218) (actual value Ax – Ay)
● Analog threshold trigger (Page 213) (actual value Ax)
● Analog amplifier (Page 226) (actual value Ax)
● Analog multiplexer (Page 248) (actual value AQ)
● Analog ramp (Page 251) (actual value AQ)
● Mathematic instruction (Page 265) (actual value AQ)
● PI controller (Page 256) (actual value AQ)
● Up/down counter (Page 201) (actual value Cnt)
If your LOGO! is a LOGO! 0BA7, you can additionally use the actual values of the following
functions:
● Analog filter (0BA7 only) (Page 271) (actual value AQ)
● Average value (0BA7 only) (Page 276) (actual value AQ)
● Max/Min (0BA7 only) (Page 273) (actual value AQ)
● On-delay (Page 160) (current time Ta)
LOGO!
Manual, 04/2011, A5E03556174-01
Wiring
Input Trg
Parameter
Output Q
!L
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.
!
T
determines the length of the pre-warning signal.
!L
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
!
LOGO! functions
can be provided
!L
179

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