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冗余技术是提高EPICS(Experimental Physics and Industrial Control System)在核电领域应用可靠性的有效解决方案。不同于当前采用的“热备用”冗余模式,本文借鉴IEC 62439-3标准所发布的并行冗余协议(Parallel Redundancy Protocol,PRP)阐述的“并行”冗余模式,分析了该协议的应用层实现方案用于EPICS系统的可行性,并参照EPICS的通道访问协议(Channel Access,CA),在Linux系统下开发了基于PRP的EPICS CA协议软件。测试表明,基于PRP应用层协议方案的EPICS CA协议,在网络单点故障时可以实现无缝切换的高可靠性要求,为提高核电领域EPICS系统的通信网络可靠性,提供了实现方式。
Redundancy technology is an effective solution to improve the reliability of the application of the Experimental Physics and Industrial Control System (EPICS) in nuclear power. Different from the currently used “hot standby” redundancy mode, this paper draws on the “parallel” redundancy mode described by the Parallel Redundancy Protocol (PRP) issued by the IEC 62439-3 standard, The application layer protocol of the protocol is used for the feasibility of the EPICS system. With reference to EPICS Channel Access (CA), EPICS CA protocol software based on PRP is developed under the Linux system. The test shows that the EPICS CA protocol based on the PRP application layer protocol scheme can realize the seamless handover with high reliability when the single point of network failure is achieved and provides an implementation method for improving the reliability of the EPICS communication network in the nuclear power field.