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4. KooN redundant architectures
4.1 Definition
By definition, the notion of redundancy refers to the existence, within an entity, of more than one means of accomplishing a required function. So, in order to reduce the probability of a system not fulfilling its safety function at the time it is called upon, 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....
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KooN redundant architectures
Common causes
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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