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3. Typology of failure rates
3.1 Definitions
IEC 61508-4 defines a failure as the cessation of the ability of a functional unit to perform a required function. It also considers that failures can be of two types:
dangerous: a failure that has the potential to place the safety-related system in a dangerous state or make it impossible to perform its function;
in safety: a failure which does not have the potential to place the safety-related system in a dangerous state or make it impossible to perform its function.
These failures are then divided into two categories:
detected: failure detected by diagnostic tests, periodic tests, operator intervention...
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Typology of failure rates
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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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