21
8.7 Example of use
Safety-related monitoring of two sensor circuits that act on one switching output, 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.
8.8 Functional test
The plant / machine must be tested for proper function after all of the electrical connections have been
established and the supply voltage has been turned on. To do this, activate each of the sensors in sequence
and check the corresponding reactions of the switching unit.
The safety system is to be professionally inspected at appropriate intervals and be documented in such a way
that it is comprehensible at all times. The requirements of the plant/machine manufacturer are to be taken
into account and followed.
English
+24 V DC
0 V DC
Sensor CH1
Sensor CH2
Test
Signal
SPS
Machine Control
Y1
Y2
SK
34
8,
2
ΚΩ
A1
A2
K1
14
A1
A2
1
2
K1
3
4
5
6
L
1
L
2
L
3
A2
A1
Q
1.1
Q
1.2
K2
A1
A2
13
1
2
K2
I
1.1
X1
X2
8,
2 Κ
Ω
M
