Monitoring The Connection Wiring; Monitoring By A Safety Relay - Pilz Intern PMC SR6 Manual

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11.2

Monitoring the connection wiring

The PMC SR6 safety module does not require any maintenance; however, it cannot detect external
wiring errors.
11.2.1

Monitoring by a safety relay

If the STO
inspects the wiring and the switching capability of the outputs using test pulses.
In the event of an error, always switch the device off using the other STO input and then correct the
error.
Manual PMC SR6 safety module
1005344-en-US-01
Intern
WARNING!
Loss of safety function and unexpected drive motion due to wiring errors!
The PMC SR6 safety module does not detect any errors in the connecting wiring of
X12!
To identify or eliminate these errors and prevent a possible error in the wiring or
actuation of the safety function from causing a loss of safety, take one of the
following actions.
▪ Continuous monitoring of the connecting wiring by a safety relay
▪ Fault exclusion for lines and connections in accordance with DIN EN 13849, or
▪ Monitoring of the connecting wiring by checking the plausibility of the actuation
signals from STO
function test).
and STO inputs are activated by monitored outputs, the accompanying safety relay
a b
and STO against the STO status signals (by means of STO
a b
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