User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 04/2011, A5E03556174-01
169
● Retentive on-delay (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 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
5
4
7
7UJ
7KHEROGVHFWLRQRIWKHWLPLQJGLDJUDPLVDOVRVKRZQLQWKHV\PERORIWKH
UHWHQWLYHRQGHOD\
7DH[SLUHV
Functional description
The 0 to 1 signal transition at input Trg triggers the current time T
a.
Output Q is set when T
a
=
T. A further signal at input Trg does not influence the time T
a
.
The output and the time T
a
are reset with the next 1 signal at input R.
If retentivity is not set, output Q and the expired time are reset after a power failure.