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5. Glossary
Aussi bon que neuf; as good as new (AGAN)
Calculation assumption used in the standard IEC 61508-6 . After each periodic test, PFD(t) is assumed to return to its initial value.
Danger; hazard
Potential source of damage ( EC 61511 :2016 ).
Risk; risk
Combination of the probability of damage and its severity ( IEC 61511 :2016 ).
Safe failure fraction (SFF)
Proportion of a device's overall rate of random hardware failures that results in a safety failure or a detected unsafe failure (
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- Sécurité fonctionnelle des systèmes électriques/électroniques/électroniques programmables relatifs à la sécurité. - IEC 61508 :1998 - 1998
- Sécurité fonctionnelle des systèmes électriques/électroniques/électroniques programmables relatifs à la sécurité. - IEC 61508 :2010 - 2010
- Functional safety of safety-related electrical/electronic/programmable electronic systems – Part 2: Requirements for safety-related...
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Association des exploitants d'équipements de mesure, de régulation et d'automatisme (EXERA).
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