EPA网络控制系统丢包分析

针对基于时钟同步技术的时分调度网络控制系统工作方式,分析了基于EPA协议的网络丢包原理.建立在不同实时性要求情况下EPA网络系统的丢包模型,并且分析了时钟偏差抖动为马尔科夫链时,通信周期、时间片长度以及时钟同步精度对系统稳定性的影响.提出了提升EPA系统实时性的方法.最后对EPA系统的稳定性进行了分析.

Analysis of Packet Dropouts in EPA Based Networked Control Systems

With respect to the working mechanism of networked control systems with time division scheduling based on
clock synchronization, the causes for data packet dropouts in ethernet for plant automation(EPA) based networked control systems are analyzed. A model of EPA systems with data packet dropouts according to different requirements of real time performance is established. The influences that the communication cycle, the length of time slot and the precision of clock synchronization exert on the stability of systems are given while the distribution of clock deviation jitter is a Markov chain. Methods to improve the real time performance of EPA systems are proposed. Finally, the stability of the EPA system is analyzed.