JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE C 2013 Vol.14 No.6 P.433-448

http://doi.org/10.1631/jzus.C1200363

Improving the real-time performance of Ethernet for plant automation (EPA) based industrial networks

Author(s): Li Lu, Dong-qin Feng, Jian Chu
Affiliation(s): Institute of Cyber-Systems and Control, Zhejiang University, Hangzhou 310027, China; more
Corresponding email(s): llu@iipc.zju.edu.cn, dqfeng@iipc.zju.edu.cn
Key Words: Ethernet for plant automation (EPA), Fast real-time (FRT) system, Real-time Ethernet (RTE), Scheduling scheme

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Abstract: real-time Ethernet (RTE) control systems with critical real-time requirements are called fast real-time (FRT) systems. To improve the real-time performance of ethernet for plant automation (EPA), we propose an EPA-FRT scheme. The minimum macrocycle of EPA networks is reduced by redefining the EPA network frame format, and the synchronization process is modified to acquire higher accuracy. A multi-segmented topology with a scheduling scheme is introduced to increase effective bandwidth utilization and reduce protocol overheads, and thus to shorten the communication cycle significantly. Performance analysis and practical tests on a prototype system show the effectiveness of the proposed scheme, which achieves the best performance at small periodic payload in large scale systems.

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