Siemens LOGO!, Руководство пользователя

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LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 04/2011, A5E03556174-01
165
● Retentive on-delay (Page 168) (current time Ta)
● Wiping relay (pulse output) (Page 170) (current time Ta)
● Edge triggered wiping relay (Page 172) (current time Ta)
● Asynchronous pulse generator (Page 175) (current time Ta)
● Stairway lighting switch (Page 179) (current time Ta)
● Multiple function switch (Page 182) (current time Ta)
● Stopwatch (0BA7 only) (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 timebase ranges and parameter preset, refer to the On-delay
(Page 160) topic.
Timing diagram
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4
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Functional description
Output Q is set to hi immediately when the input Trg changes to hi.
The actual time T
a
in LOGO! is retriggered at the 1 to 0 transition of Trg. The output remains
set. Output Q is reset to 0 with off-delay when T
a
reaches the value configured at T (T
a
=T).
The time T
a
is retriggered with a one-shot at input Trg.
You can set input R (Reset) to reset the time T
a
and the output before T
a
has expired.
If retentivity is not set, output Q and the expired time are reset after a power failure.