On-/Off-Delay - Siemens LOGO! Manual

Timing diagram
Functional description
Output Q is set to hi immediately when the input Trg changes to hi.
The actual time T
set. Output Q is reset to 0 with off-delay when T
The time T
You can set input R (Reset) to reset the time T
If retentivity is not set, output Q and the expired time are reset after a power failure.
4.4.3

On-/Off-delay

Short description
The on-/off-delay function sets the output after the set on-delay time has expired, and resets
it upon expiration of the off-delay time.
Symbol in LOGO!
LOGO!
Manual, 10/2017, A5E01248535-AA
in LOGO! is retriggered at the 1 to 0 transition of Trg. The output remains
a
is retriggered with a one-shot at input Trg.
a
Wiring
Input Trg
Parameter
Output Q
4.4 Special functions list - SF
reaches the value configured at T (T
a
and the output before T
a
Description
A positive edge (0 to 1 transition) at input Trg (Trig-
ger) triggers the on-delay time T
A negative edge (1 to 0 transition) at input Trg (Trig-
ger) triggers the off-delay time T
T is the time after which the output is set hi (output
H
signal transition 0 to 1).
T is the time after which the output is reset ( output
L
signal transition 1 to 0).
Retentivity:
/ = No retentivity
R = The status is retentive.
Q is set when the configured time T
Trg is still set. It is reset on expiration of the time T
the trigger Trg has not been set again.
LOGO! functions
=T).
a
has expired.
a
.
H
.
L
has expired and
H
, if
L
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