Safety
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Safety standards:
SIL - Safety Integrity Level
The standard IEC 61508 defines 4 Safety Integrity Levels (SIL) for safety functions.
SIL1 is the lowest level and SIL4 is the highest level.
A hazard and risk analysis serves as a basis for determining the required SIL.
This is used to decide whether the relevant function chain is to be considered as a safety function
and which hazard potential it must cover.
PF - Probability of Failure
The standard IEC 61508 defines SIL using requirements grouped into 2 broad categories:
hardware safety integrity and systematic safety integrity. A device or system must meet the
requirements for both categories to achieve a given SIL.
The SIL requirements for hardware safety integrity are based on a probabilistic analysis of the
device. To achieve a given SIL, the device must meet targets for the maximum probability of
dangerous failure and a minimum Safe Failure Fraction. The concept of “dangerous failure” must
be rigorously defined for the system in question, normally in the form of requirement constraints
whose integrity is verified throughout system development. The actual targets required vary
depending on the likelihood of a demand, the complexity of the devices, and types of redundancy
used.
Summary of Contents for eXLhoist
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