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11.2.2
Fault exclusion for lines/connections in accordance with DIN EN 13849
Errors in the connecting wiring of modules and components can lead to loss of safety functions.
Possible measures for excluding faults and information on fault exclusion are provided in table D.4 of
the standard DIN EN ISO 13849-2.
Observed errors
Short circuit between any two
conductors
Short circuit between any
conductor and an unprotected
conductive part or the ground
or a grounding conductor
connection
Interruption of a conductor
DIN EN 13849, table D.4 – Errors and measures for excluding faults – lines/cables
11.2.3
Monitoring by means of plausibility check of the signals
The state of the connecting wiring and the function of the safety channels can be verified with a
plausibility check.
In order to check the plausibility of the activation signals of both the STO
the STO status signals, perform an STO function test after each deactivation of STO function or
before activation.
Shorter test cycles may be necessary depending on the respective application area, the intended use
of the safety relay or machine-specific and system-specific requirements.
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
Fault exclusion
Short circuits between
conductors that are either:
}
Permanently installed and
protected from external
damage, e.g. by cable duct or
armored conduit
}
In different sheathed cables
}
Inside an electrical
installation space (see note)
}
Individually protected by a
ground connection
Short circuits between
conductors and any
unprotected conductive part
inside an installation space
(see note)
No
Remarks
The lines as well as the
installation space must
correspond to the respective
requirements
(see IEC 60204-1)
–
and STO
inputs against
a
b
Pilz | 27
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