Installation manual
HB-37420-810-01-25F-EN PSC1-C-100 Installation manual - V2.2.docx Page 186 of 201
Version: 25F
12.3.5.3 Consideration of systematic failures
In addition, systematic failures are also to be considered in the hardware specification.
Example of measures against systematic failures:
Loss of power during operation. If there is a hazard here, a power loss must be considered
like an operating state. The SRP/CS must control this state such that the safe state is
retained.
Measures against systematic failures according to Annex G DIN EN ISO 13849-1:
Source BGIA Report 2/2008
Fault exclusions:
If there are fault exclusions for certain devices or system components, these are to be stated
and specified in detail.
Fault exclusions can be, e.g. mech. shaft fracture, sticking switching contacts, short-circuits
in cables and wires etc.
The admissibility of the fault exclusions is to be justified, e.g. by referencing permissible fault
exclusions according to applicable standards e.g. EN ISO 13849-1)
If special measures are necessary for these fault exclusions, these are to be stated.
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