19
Application example
Safety-related monitoring of two PSS circuits with the SK 35 safety controller and a PLC-machinery
control system.
For the functional verification of the safety system the PLC performs a test signal and evaluates the
reaction of the safety controller prior to each dangerous movement or in a non dangerous phase /
movement of the machine. If the test is correct, the PLC starts the movement or the next working
step of the machine.
Functional Check
After appropriate connection of all required electrical connections and switching on the supply voltage,
the safety system must be checked for correct function. To do this, successively operate all PSSs
and monitor the associated reaction of the SK 35 safety controller.
The safety system is to be checked in proper time intervals by qualified personnel, and has to be
documented in such a way that it can be viewed and understood at any time. The requirements of
machine manufacturer are to be considered and kept.
English
Y1
Y2
SK 35
Se
ns
or
CH
2
8,
2
ΚΩ
A1
B2
Test
Signal
K1
14
A1
A2
+24VDC
0VDC
M
1
2
K1
3
4
5
6
L1 L2 L3
PLC
Controller
A2
B1
Q1.1 Q1.2
K3
A1
A2
13
1
2
K3
I1.1
X1
X2
Se
ns
or
CH
1
8,
2
ΚΩ
K2
24
A1
A2
23
3
4
K3
I1.1
Ou
t C
H
2
Ou
t C
H
1
M
1
2
K2
3
4
5
6
L1 L2 L3