Functional safety - Safety instrumented systems for the process industry sector - Part 4: Explanation and rationale for changes in IEC 61511-1 from Edition 1 to Edition 2
This part of IEC 61511, which is a Technical Report,
• specifies the rationale behind all clauses and the relationship between them,
• raises awareness for the most common misconceptions and misinterpretations of the clauses and the changes related to hem,
• explains the differences between Ed. 1 and Ed. 2 of IEC 61511-1 and the reasons behind the changes,
• presents high level summaries of how to fulfil the requirements of the clauses, and
• explains differences in terminology between IEC 61508-4:2010 and IEC 61511-1 Ed. 2.
Life cycle
NOW
PUBLISHED DS CLC IEC/TR 61511-4:2020 60.60
Standard published Dec 19, 2025
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