16
6 Setup
VEGATOR 121 •
57662-EN-210714
with optional fail safe relay as well as a PLC are required. The follow-
ing setup is necessary:
10
11
12
1
2
16
17
13
14
15
+
-
1
2
3
4
5
6
Fig. 3: Automated function test via fail safe relay and PLC
1 Digital PLC output
2 PLC
3 Digital PLC input
4 Sensor
5 VEGATOR 121
6 Fail safe relay
With the relay contact of the PLC output, the sensor current must be
interrupted for at least 1 s. The switching-on impulse delivered by the
sensor is controlled by VEGATOR 121. After a time of 6 s after switch-
ing on the sensor again, the result of the test will be available on the
fail safe output and can be further processed by the PLC.
