交换式工业以太网的时延分析

Analysis of Delay in Switched Industrial Ethernet

交换式工业以太网应用于工业控制领域,实现了工业一体化网络控制,但其实时性问题一直是阻碍其大规模应用的主要因素,在对交换式工业以太网中传输时延因素分析的基础上,得出了排队时延是影响网络确定性的主要因素。为此采用了确定性网络演算理论对其实时性进行了分析和研究,结合极小加代数下的到达曲线和服务曲线的概念,针对特定的混合队列调度模型,在树形拓扑结构的交换式以太网的基础上计算了其业务流端到端的传输时延上限。

Switched industrial Ethernet uesed in industrial control field,it realized indutrial i- ntergration network control,but its real time problem has always been the main factor that hinder i- ts large- scale application. On the basis of analyzing the transimission delay of Ethernet,we conclu-ed that the queuing dealy is the main factors influencing the certainty of network. Therefore the d-eterministic network calculus theroy is adopted to analyze its real- time character. Combined with the concept of arrival and service curve that contained in the minimum plus algebra,for a particul-ar mixed queue scheduling model,on the basis of switched Ethernet of the tree topology,we calcul-sed the maximum end- to- end transmission delay.