LOGO! Manual
A5E00380835-01
156
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
a
,
and output Q remains set.
Output Q is reset when T
a
= T. You can output a warning
signal before the off-delay time (T – T
!
) has expired to reset
Q for the time of the pre-warning period T
!L
.
A further one-shot at input Trg during T
a
retriggers the time
T
a
.
If retentivity is not set, output Q and the expired time are
reset after a power failure.
Preset of the Par parameter
Note the defaults specified in Chapter 4.3.2.
Note
All times must have the same timebase.
View in programming mode (example):
B9 1+R
T =60:00s
Protection mode and retentivity
Off-delay time
Press
B9 2
T! =05:00s
T!L =00:10s
Start of the off-warning period
(T – T
!
)
Off-warning time
LOGO! functions
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