Example Of Use; Connection Of Multiple Sensors - ASO Safety Solutions SK 31 Manuel D'utilisation

SK 31 Safety Relay

6.5 Example of use

Safety-related monitoring of a sensor circuit with primary PLC or machine control.
For a functional test of the protection, the PLC/machine control performs a test prior to each dangerous
movement or in the non-dangerous phase/movement of the machine. If the test result is correct, the
PLC/machine control then initiates the movement or the next work step.
24VDC
A1 L1
SK 31-31
A2 N
0VDC

6.6 Connection of multiple sensors

The SK 31 switching unit is only equipped with one input for sensors. Nevertheless, it is possible
to connect two or more sensors to the switching unit. For this purpose, the individual sensors are
connected in series according to figure 1.
Sensor 1
O
2
C
Figure 1: Wiring of multiple sensors; in this example: safety contact edge
18
Relay
X2
X1
Test
Signal
PE 13 14
1
K2
2
K1
A1
A2
2
A1
A2
Sensor 2
2
L1 L2 L3
I1.1
K1
1
PLC
2
M
Q1.1 Q1.2
K2
A1
A2
Sensor „n"
2
3 5
4 6