User's 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 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).
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.