User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 04/2011, A5E03556174-01
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 re
quire
d 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
7
4
7UJ
7KHEROGVHFWLRQRIWKHWLPLQJGLDJUDP
DOVRDSSHDUVLQWKHV\PERORIWKH
ZLSLQJUHOD\
7DLVH[SLULQJ
7KDVQRWH[SLUHG
Functional description
A 0 to 1 transition at input Trg sets the output, and triggers a time T
a
during which the output
remains set.
Output Q is reset to lo (pulse output) when T
a
reaches the value preset at T (T
a
= 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.