以太网在工业应用中的实时特性研究  

Study on real-time characteristics of ethernet in industrial application

作　　者：陈磊[1] 冯冬芹[1] 金建祥[1] 褚健[1] 

机构地区：[1]工业控制技术国家重点实验室浙江大学先进控制研究所,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2004年第6期670-675,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家"863"高技术研究发展计划资助项目(2001AA413010).

摘　　要：总结了以太网实时问题的研究现状,以工业控制过程为背景,分析了以太网端到端的通信延迟并给出计算方法.通过仿真实验,讨论了在同时、随机、调度三种信息发送方式下,标准以太网和快速以太网的实时特性.研究表明,快速以太网的实时能力明显优于标准以太网;在网络负荷低时调度发送方式的实时性能最优,但存在明显的频率转折点;在网络负荷饱和时三种信息发送方式的实时性能没有显著差别.Based on the research status of real-time Ethernet, End-to-End delay of Ethernet in industrial control processes was analyzed, and its calculation procedure was presented. Through simulation experiment, the real-time characteristics of standard Ethernet and fast ethernet under three information releasing modes (synchronous, random, scheduled) were discussed. The results show that the real-time performance of fast Ethernet is obviously better than that of standard Ethernet; and in low traffic load, the real-time performance of Ethernet under scheduled releasing mode is the best, but a visible frequency turning point exists, and when the traffic load is saturated, there is no difference under the three information releasing modes.

关 键 词：以太网 工业应用 端到端通信延迟 冲突检测 载波侦听多路访问 实时 

分 类 号：TP393.11[自动化与计算机技术—计算机应用技术] TN911[自动化与计算机技术—计算机科学与技术]