LOGO! manual
EWA 4NEB 712 6006-02
24
3.5.2 On-delay
The on-delay is represented in a
circuit diagram by a relay with on-
delay:
Trg
T
Q
In LOGO! the symbol for on-
delay is as follows:
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
T
T
T
a
starts
Q
The bold part of the timing dia-
gram appears in the on-delay
symbol.
When the state at the Trg input changes from 0 to 1, the time T
a
begins to
elapse (T
a
is the current time in LOGO!). If the state at the Trg input re-
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.
Programming LOGO!
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