On-Delay - Siemens LOGO! Series Manual

Programming LOGO!

3.5.2 On-delay

The on-delay is represented in a
circuit diagram by a relay with on-
delay:
Trg input You start the time for the on-delay by means of the Trg input (TRG
stands for trigger)
Parameter T T is the time after which the output
is switched on (output signal changes from 0 to 1).
Timing diagram
Trg
Q
T
T starts
a
When the state at the Trg input changes from 0 to 1, the time T
elapse (T is the current time in LOGO!). If the state at the Trg input re-
a
mains 1 for long enough, the output is set to 1 after the time T has elapsed
(there is a delay between the input being switched on and the output com-
ing on).
If the state at the Trg input changes back to 0 before the time T elapses,
the time is reset.
The output is reset to 0 when the Trg input has the state 0.
24
In LOGO! the symbol for on-
delay is as follows:
Trg
T
The bold part of the timing dia-
gram appears in the on-delay
symbol.
T
Q
begins to
a
LOGO! manual
EWA 4NEB 712 6006-02