Siemens LOGO! Series Manual page 171

● Wiping relay (pulse output) (current time Ta)
● Edge triggered wiping relay (Page 172) (current time Ta)
● Asynchronous pulse generator (Page 175) (current time Ta)
● Stairway light switch (Page 179) (current time Ta)
● Multiple function switch (Page 182) (current time Ta)
● Stopwatch (Page 198) (actual value AQ)
● Threshold trigger (Page 210) (actual value Fre)
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 160) topic.
Timing diagram
Functional description
A 0 to 1 transition at input Trg sets the output, and triggers a time T
remains set.
Output Q is reset to lo (pulse output) when T
The output is immediately reset if there is a 1 to 0 transition at input Trg before the specified
time has expired.
If retentivity is not set, output Q and the expired time are reset after a power failure.
LOGO!
Manual, 04/2011, A5E03556174-01
4.4 Special functions list - SF
reaches the value preset at T (T
a
LOGO! functions
during which the output
a
= T).
a
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