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IEC TR 61511-4:2020(E), Functional safety - safety instrumented systems for the process industry sector, 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 them,
  • 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.