功能安全.过程工业部门的安全仪表系统.第4部分:IEC 61511-1从第1版更改为第2版的说明和基本原理

[中文适用范围]： 本文档作为IEC 61511的技术报告： - 规定了IEC 61511-1第2版（Ed. 2）各条款及其相互关系的依据； - 提高了对相关条款及其变更的常见误解和错误解读的意识； - 解释了IEC 61511-1第1版与第2版之间的差异及其原因； - 提供了如何满足条款要求的高层次总结； - 解释了IEC 61508-4:2010与IEC 61511-1第2版之间术语的差异。 [外文原描述]： 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.