PD CLC IEC/TR 61511-4:2020

This standard PD CLC IEC/TR 61511-4:2020 Functional safety. Safety instrumented systems for the process industry sector is classified in these ICS categories:

• 13.110 Safety of machinery
• 25.040.01 Industrial automation systems in general

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 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.