Redundancy and hot swap technology in industrial Ethernet EtherCAT
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摘要: EtherCAT是一种实时工业以太网协议,使用冗余技术是实现热插拔和提高通信可靠性的重要手段.首先介绍了实时工业以太网EtherCAT的组成、工作原理和报文结构,研究了使用环型网络拓扑结构实现基于EtherCAT的工业自动化控制系统故障容错及热插拔技术,分别规划了在网口故障、链路故障和节点故障时冗余帧传播机制、故障点定位和恢复策略.开发了链路冗余EtherCAT主站驱动程序,将常规EtherCAT主站驱动程序做了修改,加入链路冗余机制,对上层应用屏蔽了冗余信息和操作.最后完成了冗余和热插拔的性能测试实验,结果表明系统性能优越,运行稳定.Abstract: EtherCAT is a type of real-time industrial Ethernet protocol for data communication in automation control system. Redundancy is an important way for hot swap and improving the communication reliability. The architecture, principle and frame structure of the EtherCAT were introduced. The fault tolerance and hot swap technology in EtherCAT based industry automation control system were proposed with ring topology. The master carries two full duplex Ethernet interfaces, forming two logical data stream. If there is a failure in the link, the EtherCAT slave will automatically loop back the data frames, so the ring topology is fault tolerant for one point failure. Redundancy frame transmission mechanism, fault location and recovering for network interface failure, link broken and node failure were laid out. The EtherCAT master driver with link redundancy was developed by adding the redundancy control to the normal EtherCAT master driver. It proves that the system is robust and has excellent performance of redundancy and hot swap function.
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Key words:
- industrial Ethernet /
- EtherCAT /
- redundancy /
- ring topology
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[1] Geon Yoon, Dae Hyun Kwon, Soon Chang Kwon, et al. Ring topology-based redundancy Ethernet for industrial network 2006 SICE-ICASE International Joint Conference. Piscataway, NJ:IEEE,2006:1404-1407 [2] EtherCAT Technology Group (ETG). EtherCAT:the Ethernet Fieldbus[J]. PC Control, 2005,7:14-19 [3] Madren Frank. Redundancy with standards in industrial Ethernet LANs [J]. Engineer IT, 2006:72-75 [4] 王常力, 罗安.分布式控制系统(DCS)设计与应用实例[M].北京:电子工业出版社,2004:386-390 Wang Changli, Luo An. Design and application of distributed control system(DCS)[M]. Beijing: Publishing House of Electronics Industry, 2004:386-390(in Chinese)
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