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5. Glossary
Aussi bon que neuf; As Good As New (AGAN)
Calculation assumption used in IEC 61508-6. After each periodic test, the PFD(t) curve is assumed to return to its initial value.
Safety Integrity Level; SIL Level
IEC 61508 introduces four discrete levels whose function is to specify requirements (qualitative and quantitative) concerning the safety integrity of safety functions. Each SIL level has a corresponding risk reduction factor.
Probabilité de défaillance moyenne à la demande; Average of Probability of Failure on Demand
Average value of the probability of failure on demand PFD(t) over the time interval between two function tests.
Redundancy; Redondance
Existence, in an entity, of more than one means to accomplish a...
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