Dual path communications over multiple spanning trees for networked control systems
Engineering Applications of Artificial Intelligence
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Of the numerous Industrial Ethernets specified in IEC 61158 & IEC 61784, few provide physical redundancy and none provides a redundancy method that is independent of the upper layer protocols. To allow automation networks to support simultaneously different protocols, IEC SC65C working group 15 produced the IEC 62439 standard suite that defines redundancy methods applicable to most industrial networks, and which differ on the topology and the recovery time. This paper describes HSR (IEC 62439-3 Clause 5 [1]), a zero recovery time redundancy method applicable to hard real time systems, based on duplication of the transmitted information and flooding of the network, with removal of duplicates in each node. This method is first applied to a ring, and can be extended to any topology, in particular rings of rings. It will be applied to electrical substation networks based on the IEC 61850 standard, which references HSR.