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A B C D E F G H I J K L M N O P Q R S T U V W Z All terms

Safety Integrity Levels (SIL)

A performance criterion for a SIF defining the probability of the SIF failing to perform its function on demand.

Safety Integrity Level Demand Mode of Operation

Average Probability of Failure on Demand

Risk Reduction


>=10-5 to 10-4

>10,000 to =<100,000


>=10-4 to 10-3

>1,000 to =<10,000


>=10-3 to 10-2

>100 to =<1,000


>=10-2 to 10-1

>10 to =<100

See IEC 61511, Part 1 (IEC 6511) for SILs for Continuous Mode of Operation.


  • Layer Of Protection Analysis - Simplified Process Risk Assessement, 2001, CCPS, ISBN 0-8168-0811-7

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