通过对EPA 通信结构和EPA 通信调度策略的分析,讨论了EPA 工业以太网中影响其 确定性的可能因素,介绍了EPA 网络中MAC 介质访问层对各种传输数据的处理方法,得出了EPA 工业以太网确定性的结论,为进一步设计实现EPA 工业以太网提供了参考。 关键词:工业以太网;EPA;确定性 Abstract: Based on the analysis of communication model and strategy of communication schedule, the possible reasons that impact the determinism in EPA Industrial Ethernet are discussed, the processing means that transfer data in MAC are introduced, and the result of deterministic EPA Industrial Ethernet is concluded, the reference of design and implement of EPA is given. Key words: Industrial Ethernet;EPA;Determinism