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4. KooN redundant architectures
4.1 Definition
The notion of redundancy refers to the existence, within an entity, of more than one means of accomplishing a required function. So, to reduce the probability of a system not fulfilling its safety function at the time it is required, one solution is to redundant some of the system's constituent elements.
A KooN redundancy is a so-called majority redundancy, such that a function is only ensured if at least K of the N existing means are in working order or in operation.
For example, 1oo2 redundancy comprises two elements, so that each can handle the safety function. In this way, the "dangerous" failure of both elements is necessary to ensure that a valid alarm signal is not adequately processed. The most frequently encountered...
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KooN redundant architectures
Common causes of failure
Bibliography
Bibliography
Standards and norms
- Analysis techniques for dependability – Reliability diagram block and Boolean methods - IEC 61078 - Août 2006
- Sécurité fonctionnelle des systèmes électriques/électroniques/électroniques programmables relatifs à la sécurité - IEC 61508 - Avril 2010
- Analyse par arbre de panne - IEC 61025 - Décembre 2006
- Functional safety – Safety instrumented systems for process manufacturing - IEC 61511-1 - Février...
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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