User Manual

Working with contacts and
relays
119
08/04 AWB2528-1423GB
Rules for wiring relay coils
Relay with contactor function
Coil with contactor function
Ä
The output signal follows immediately after the input signal
and the relay acts as a contactor.
Figure 60: Signal diagram of contactor function
Impulse relay ä
The relay coil switches whenever the input signal changes
from 0 to 1. The relay behaves like a bistable flip-flop.
:
Figure 61: Signal diagram of impulse relay
h
A coil should only be used once in order to retain an
overview of the relay states. However, retentive coil
functions such as
S, R, ä can be used several times.
The following applies to non-retentive coil functions such
as
Ä (contactor), Å (negated contactor), È, è (rising and
falling edge detection): Each coil must only be used once.
The last coil in the circuit diagram determines the status of
the relay.
Exception: When working with jumps, the same coil can
be used twice.
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