LP21/LP22
Pag.
11
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37
LP21/LP22 Installation instructions en
Sensors
5.3
Signal outputs
The relay variants are intended particularly for situations which require mechanical switches with high power
outputs.
5.3.1
Relay outputs with changeover contact
The relays are designed as changeover contacts. Thus the outputs can be connected as normally closed
(NC) or as normally open (NO). The relays are potential-free andsuitable for many different types of
switching modes.
All signal outputs can be inverted . In this case, when the power supply is turned on, normally open contacts
function as normally closed contacts, and vice versa. This happens by switching between open-circuit and
closed-circuit principle.
Loop malfunctions can also be interpreted as
loop covered
or as
loop free
.
Status
Normally closed contact (NC)
Normally open contact (NO)
Not inverted (open-
circuit principle)
Inverted (closed-
circuit principle)
Not inverted (open-
circuit principle)
Inverted (closed-
circuit principle)
Power supply off
Detector ready, loop
free
Loop covered
Tab.4: Switching states of the signal outputs
The analogue outputs of the relay variants are connected to the red and yellow terminal blocks according to
the following illustration.
NO1
NO2
Normally open contact to output 1 (NO1) or output 2
(NO2)
COM1
COM2
Common contact to output 1 (COM1) or output 2
(COM2)
NC1
NC2
Normally closed contact to output 1 (NC1) or output 2
(NC2)
Fig.5: Relay connections 1 (yellow) and 2 (red)
