IEC TR 62541-1:20 20作为IEC TR 62541-1:20 20 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 62541-1:20 20介绍了OPC统一架构（OPC UA）的概念和概述。阅读本文档有助于理解这个多部分文档集的其余部分。简要解释了IEC 62451的每个其他部分以及建议的阅读顺序。

IEC TR 62541-1:2020 is available as IEC TR 62541-1:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 62541-1:2020 presents the concepts and overview of the OPC Unified Architecture (OPC UA). Reading this document is helpful to understand the remaining parts of this multi-part document set. Each of the other parts of IEC 62451 is briefly explained along with a suggested reading order.