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7. Notion of minimal architecture
7.1 IEC 61511 requirements
PFD calculations avg are fraught with uncertainty, partly due to doubts about the reliability data used (λ, etc.). To make this PFD assessment process avg more pragmatic, the IEC 61511 standard provides minimum requirements in terms of redundancy to justify a SIL level.
To justify a SIL level, in addition to the PFD avg or PFH requirements, IEC 61511-1 defines minimum architecture requirements. According to the standard: "For safety instrumented functions, sensors, logic units and terminal elements shall have a minimum hardware fault tolerance (HFT)".
To say that a device...
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Notion of minimal architecture
Conclusion
Bibliography
Standards and norms
- Analysis techniques for dependability – Reliability diagram block and Boolean methods - IEC 61078 -
- Functional safety of safety-related electrical/electronic/programmable electronic systems – chapters 1 to 7 - IEC 61508 -
- Sécurité fonctionnelle des systèmes instrumentés de sécurité pour le secteur de l'industrie des procédés continus - IEC 61511 -
- Analysis techniques for dependability – Reliability...
Organizations
French National Institute for Industrial Environment and Risks (INERIS) http://www.ineris.fr
Instrumentation Society of America (ISA) https://www.isa.org/http://www.isa-france.org
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