Siemens LOGO! Manual page 138

LOGO! functions
4.4 Special functions list - SF
Timing diagram
Functional description
A 0 to 1 signal transition at input Trg sets output Q. The next 1 to 0 transition at Trg
retriggers the current time T
Output Q is reset when T
T ) has expired to reset Q for the time of the pre-warning period T
!
A further one-shot at input Trg during T
If retentivity is not set, output Q and the expired time are reset after a power failure.
Setting the Par parameter
Note the defaults specified in topic Time response (Page 115).
Note
All times must have the same timebase.
View in programming mode (example):
Press
138
, and output Q remains set.
a
= T. You can output a warning signal before the off-delay time (T -
a
retriggers the time T
a
.
!L
.
a
Manual, 10/2017, A5E01248535-AA
LOGO!