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Article | REF: SE4058 V3

Probability of failure of the safety function

Author: Olivier IDDIR

Publication date: September 10, 2024

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7. Notion of minimal architecture

7.1 IEC 61511 requirements

The calculations of PFDavg are subject to uncertainty, partly due to doubts about the reliability data used ( λ etc.). To make the SIL assessment process more pragmatic, IEC 61511 provides minimum requirements in terms of redundancy to be verified in order to claim a given SIL level.

Thus, to justify a SIL level, in addition to the requirements on the value of the PFDavg...

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