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Connection
24 V
DC
0 V
Fig. 4: X12 wiring – PMC SR6 as sink for interface type D
Both STO
independent switch-off channel.
In the event of activation with contacts, errors in the connection wiring can be detected only in some
cases. Possible short circuits and cross circuits can be determined only by line or output tests.
Wiring in accordance with interface type D detects short circuits and cross circuits in the connection
wiring.
7.3
Parallel connection
It is possible to activate STO on multiple drive controllers simultaneously using the output of a safety
relay. A parallel connection of multiple drive controllers is possible depending on the required safety
figure.
Manual PMC SR6 safety module
1005344-en-US-01
Intern
PLC
Input
X12
1
2
3
4
5
6
7
8
STO
Drive controller
and STO
inputs are connected together; the GND reference potential serves as a second
a
b
WARNING!
Property damage and injury to persons due to loss of safety function!
In parallel connection, possible wiring or activation errors can lead to the loss of
safety function for all drive controllers.
▪
Take appropriate measures to detect or exclude wiring faults (see the chapter
Monitoring the connection wiring [
▪
Be aware that the STO
evaluation.
26]).
outputs cannot be connected in series for a shared
status
Pilz | 19
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