8536IB1904EN-04

Safety Integrity Level (SIL)

The standard IEC 61508 defines four safety integrity levels (SIL) for safety functions.

SIL 1 is the lowest integrity level and SIL 4 is the highest.

A hazard analysis and risk assessment serves as a basis for determining the required safety integrity level.

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.

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