IEC 62439-4:20 10适用于基于ISO/IEC 8802-3（IEEE 802.3）（以太网）技术的高可用性自动化网络。它指定基于网络复制的冗余协议，冗余协议在端节点内执行，而不是内置在交换机中的冗余协议。切换决策在每个节点中单独做出。跨网络连接能力使得单个连接的端节点能够在两个网络中的任一个上连接。它取消并取代了2008年发布的IEC 62439，构成了技术修订。它包括与IEC 62439（2008）相关的以下重大技术变更: -添加用于RSTP(快速生成树协议，IEEE 802.1 Q)的计算方法， -添加两个新的冗余协议:HSR（高可用性无缝冗余）和DRP（分布式冗余协议）， -将以前的条款1至4（引言、定义、一般方面）和附件（分类法、可用性计算）移至IEC 62439-1，其现在作为其他文件的基础， -将第5条（MRP）移至IEC 62439-2，并进行微小的编辑更改， -将第6条（PRP）移至IEC 62439-3，并进行微小的编辑更改， -将第7条（CRP）移至IEC 62439-4，并进行微小的编辑更改，以及 -将第8条（BRP）移至IEC 62439-5，并进行微小的编辑更改， -将计算受限配置(环)中的RSTP的最大恢复时间的方法添加到IEC 62439-1作为条款8， -添加HSR（高可用性无缝冗余）协议的规范，其与IEC 62439-3共享PRP的原则作为条款5，以及 -引入DRP协议作为IEC 62439-6。 本出版物应与IEC 62439-1:20 10一起阅读。

IEC 62439-4:2010 is applicable to high-availability automation networks based on the ISO/IEC 8802-3 (IEEE 802.3) (Ethernet) technology. It specifies a redundancy protocol that is based on the duplication of the network, the redundancy protocol being executed within the end nodes, as opposed to a redundancy protocol built in the switches. The switchover decision is taken in each node individually. The cross-network connection capability enables single attached end nodes to be connected on either of the two networks. It cancels and replaces IEC 62439 published in 2008 and constitutes a technical revision. It includes the following significant technical changes with respect to IEC 62439 (2008):
- adding a calculation method for RSTP (rapid spanning tree protocol, IEEE 802.1Q),
- adding two new redundancy protocols: HSR (High-availability Seamless Redundancy) and DRP (Distributed Redundancy Protocol),
- moving former Clauses 1 to 4 (introduction, definitions, general aspects) and the Annexes (taxonomy, availability calculation) to IEC 62439-1, which serves now as a base for the other documents,
- moving Clause 5 (MRP) to IEC 62439-2 with minor editorial changes,
- moving Clause 6 (PRP) was to IEC 62439-3 with minor editorial changes,
- moving Clause 7 (CRP) was to IEC 62439-4 with minor editorial changes, and
- moving Clause 8 (BRP) was to IEC 62439-5 with minor editorial changes,
- adding a method to calculate the maximum recovery time of RSTP in a restricted configuration (ring) to IEC 62439-1 as Clause 8,
- adding specifications of the HSR (High-availability Seamless Redundancy) protocol, which shares the principles of PRP to IEC 62439-3 as Clause 5, and
- introducing the DRP protocol as IEC 62439-6.

This publication is to be read in conjunction with IEC 62439-1:2010.