一种高可用性的冗余工业实时以太网设计

研究提出了一种自适应双以太网冗余方案。在以太网报文的用户数据区设计了报文时间标签。利用时间标签,采用时间优先法处理冗余报文,实现了具有零故障恢复时间的双网冗余传输通信,提高了系统的实时性;节点利用网络诊断报文建立并维护网络状态映射表,可映射网络中其他节点的故障状况;并根据报文的重要性将其进行分类,次要报文在网络状态良好时在双网上分散传输,有效地降低了网络的通信负荷。实验证明,通过以上方法可有效提高网络的可用性和安全性。

Design of high availability redundancy industrial Ethernet

This paper presents a control network redundant scheme,which is based on two redundant networks.Senders introduce message ID into standard Ethemet frame and send same messages on both networks at the same time.Receivers discard duplicates using message ID with bumpless recovery.By analyzing received network-diagnosis messages.the nodes diagnose networks mutually and maintain network status mapping-tables.Messages are classified into two main kinds according to their importance.Less important messages are transmitted separately on two redundant networks when networks work well.In this way,communication loads of both networks are reduced at usual work status.Experimental results show that this scheme improves the availability of the networks.