User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 04/2011, A5E03556174-01
167
● On-delay (Page 160) (current time Ta)
● Off-delay (Page 164) (current time Ta)
● On-/off-delay
(current time Ta)
●
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 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 timebase ranges and parameter preset, refer to the On-delay
(Page 160).
Timing diagram
7/
7+
7/
7/
4
7+7+
7UJ
7KHEROGVHFWLRQRIWKH
WLPLQJGLDJUDPLVDOVR
VKRZQLQWKH
RQRIIGHOD\V\PERO
7DH[SLUHV
7DH[SLUHV
Functional description
The time T
H
is triggered with a 0 to 1 transition at input Trg.
If the status at input Trg is 1 at least for the duration of the time T
H
, the output is set to 1 on
expiration of the time T
H
(the output follows the input with on-delay).
The time is reset when the signal at input Trg is reset to 0 before the time T
H
has expired.
A 1 to 0 transition at input Trg triggers the time T
L
.
If the status at input Trg is 0 at least for the duration of the signal T
L
, the output is set to 0 on
expiration of the time T
L
(the output follows the input with off-delay).
The time is reset when the signal at input Trg changes to 1 again before the time T
L
has
expired.
If retentivity is not set, output Q and the expired time are reset after a power failure.