IEC 61158的这一部分是为促进自动化系统组件互连而生产的系列产品之一。它与IEC 61158-1中描述的三层现场总线参考模型定义的集合中的其他标准相关。 本国际标准包含特定于21型通信协议的材料。交叉引用:ISO/IEC 10731ISO/IEC/IEEE 8802-3IEEE 754-2008ISO/IEC 9899ISO/IEC 7498-1ISO/IEC 8824-1ISO/IEC 9545ISO/IEC 8822EN IEC 61158-3-21:2019EN IEC 61158-4-21:2019IEC 61158-3-21:2019IEC 61158-4-21:2019IEC 61158-5-21:2019IEC 61158-21:2019IEC 61158-5-21:2019IEC 61158-21:2019IEC 61158-5-21:2019IEC 611784-2:2019IEC 61158-1:2019IEC 61158-2-21:2019ISO/IEC 61258-2012购买本文件时提供的最新修订包括在购买本文件中。

This part of IEC 61158 is one of a series produced to facilitate the interconnection of automation system components. It is related to other standards in the set as defined by the three-layer fieldbus reference model described in IEC 61158-1. This International Standard contains material specific to the Type 21 communication protocol.Cross References:ISO/IEC 10731ISO/IEC/IEEE 8802-3IEEE 754-2008ISO/IEC 9899ISO/IEC 7498-1ISO/IEC 8824-1ISO/IEC 9545ISO/IEC 8822EN IEC 61158-3-21:2019EN IEC 61158-4-21:2019IEC 61158-3-21:2019IEC 61158-4-21:2019IEC 61158-5-21:2019EN IEC 61158-5-21:2019IEC 61588IEC 61158-1:2019IEC 61784-2:2019ISO/IEC 8825-1ISO/IEC 7498-3ISO/IEC 8824-2ISO/IEC 646Replaces BS EN 61158-6-21:2012 which remains currentAll current amendments available at time of purchase are included with the purchase of this document.