北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2014, Vol. 37 ›› Issue (1): 43-47.doi: 10.13190/j.jbupt.2014.01.010

• 论文 • 上一篇    下一篇

工业以太网非周期数据通信实时性分析

刘宁1, 仲崇权2, 林瑶瑶2   

  1. 1. 河南理工大学 机械与动力工程学院, 河南 焦作 454000;
    2. 大连理工大学 控制科学与工程学院, 大连 116024
  • 收稿日期:2013-04-24 出版日期:2014-02-28 发布日期:2014-01-07
  • 作者简介:刘摇宁(1977—),男,讲师,博士,Email:lncn05@hpu.edu.cn.
  • 基金资助:

    国家高技术研究发展计划项目(2013AA040303);国家科技支撑计划项目(2012BAH68F02)

Real-Time Performance Analyses of Nonperiodic Data Transmission in Industrial Ethernet

LIU Ning1, ZHONG Chong-quan2, LIN Yao-yao2   

  1. 1. School of Mechanical and Power Engineering, Henan Polytechnic University, Henan Jiaozuo 454000, China;
    2. School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2013-04-24 Online:2014-02-28 Published:2014-01-07

摘要:

为了找到评估和改进EPA工业以太网通信实时性的方法,对EPA非周期报文的通信实时性能进行了研究. 通过分析EPA网络的通信调度机制和延迟产生机理,根据报文进队时机的不同,建立了4种非周期报文进队模式,并且分别对各个模式的调度特征、通信延迟和相互影响规律进行了分析,提出了非周期报文通信实时性理论模型. 通过理论分析和实例验证,发现3个制约非周期报文通信实时性的主要因素:①非周期报文传输的优先级反转;②通信调度机制的开销;③放弃发送权竞争后进队报文的处理方式.

关键词: 工业以太网, 非周期数据, 实时性, 延迟

Abstract:

To propose the method of evaluating and improving the real-time performance of Ethernet for plant automation (EPA) industrial ethernet, the real-time performance of EPA nonperiodic data transmission was studied. By analyzing EPA communication scheduling mechanism and its time delay generating regularity, nonperiodic messages were categorized as some modes according to their entering-queue time. The scheduling characteristics, communication delay of each mode and their interacting relations were studied, and the models of real-time performance of EPA system were established. Analyses and an instance verification, 3 key factors limiting the real-time performance of EPA nonperiodic messages transmission were found: ① priority inversion during the messages transmission; ② communication overhead of deterministic scheduling mechanism; ③ the processing method of nonperiodic messages that enter queue after the device gives up its competition right of transferring nonperiodic messages.

Key words: industrial Ethernet, nonperiodic data, real-time performance, time delay

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