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The Scientific World Journal
Volume 2014, Article ID 751491, 7 pages
http://dx.doi.org/10.1155/2014/751491
Research Article

Delay Analysis of Networked Control Systems Based on 100 M Switched Ethernet

College of Mathematics & Computer Science, Wuhan Textile University, Wuhan 430200, China

Received 25 January 2014; Accepted 7 May 2014; Published 5 June 2014

Academic Editor: Chin-Chia Wu

Copyright © 2014 Ming Li. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

For the delay may degrade the performance of networked control systems, networked control systems based on 100 M switched Ethernet are proposed in this paper. According to the working principle of Ethernet switch, the formulas of the upper bound delay of the single-level switched Ethernet and the multiple-level switched Ethernet are deduced by the timing diagram method, and the values of the upper bound delay are also given. The key factors that influence the upper bound delay of switched Ethernet are analyzed; then, the characteristics of the upper bound delay are presented, which show that the delay induced by the single-level 100 M switched Ethernet has little effect on the performance of control systems, while the delay induced by the multiple-level 100 M switched Ethernet may meet the time requirements of all classes of control systems if the numbers of levels and the numbers of nodes connecting to switches are set properly. Finally, the performance of networked control systems is simulated by TrueTime, and the results further show the feasibility and superiority of 100 M switched Ethernet based networked control systems without modification of the network protocols.