IEC TR 61511-4:20 20(E)，功能安全-过程工业部门的安全仪表系统，这是一份技术报告: ？指定所有子句背后的基本原理以及它们之间的关系， ？提高对条款最常见的误解和曲解以及与之相关的变化的认识， ？解释了IEC 61511-1第1版和第2版之间的差异以及变化背后的原因， ？提供如何满足条款要求的高级摘要，以及 ？解释IEC 61508-4:20 10和IEC 61511-1 Ed之间的术语差异。2.

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.