The standards, IEC 61511:2017 and IEC 61508:2010, define the criteria for Safety Instrumented Functions (abbr. SIFs).A SIF shall be fit for purpose preventing the identified hazard.The integrity level of a SIF, defined as SIL 1, 2, 3 or 4, provide risk reduction.A SIF may be compromised by systematic failures and/or random hardware failures.
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