LOGO! manual
EWA 4NEB 712 6006-02
26
3.5.4 Pulse relay
Trg
R
Q
Symbol for the pulse relay in
LOGO!
The pulse relay in a circuit
diagram:
Trg input You use the Trg input (Trg stands for trigger) to switch the
output on and off.
R input You use the R input (reset) to reset the pulse relay and set
the output to 0
(R has priority over Trg)
Timing diagram
Trg
Q
R
The bold part of the timing diagram
appears in the pulse relay symbol.
Every time the state of the Trg input changes from 0 to 1, the state of the
output (Q) changes (i.e. it is switched on or off). You reset the pulse relay
to its initial state via the R input. After power on or reset, the pulse relay is
reset and the output (Q) changes to 0.
Applications
Hall/corridor lighting
Programming LOGO!
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