摘要： 研究了基于OSI/ISO七层参考模型的Mac子层的通信协议的效率，计算并通过实验证明了应用于分布式控制系统时以太网Mac子层的最大潜力。在对基于连接的协议和基于无连接的协议进行实时性测试后，大量实验数据论证了对于采用IP协议族的分布式控制系统来讲，必须在传输层采用基于无连接的UDP协议，最后通过电力系统故障实验证明在分布式控制系统中采用以上方案可以达到实时性的要求。

关键词: 分布式控制系统, 媒体控制子层, 无连接服务

Abstract: This paper first studies the efficiency of media access control layer of OSI/ISO model in Ethernet, from the result of the study, the strongest potential ability of Ethernet is calculated and proved by the data of MAC performance tests. Then, through testing the real-time performance of connection-oriented protocol and connectionless protocol, it is proved that to the distributed control system, using connection-oriented protocol in transfer layer is unacceptable. Finally, the result of power system fault experiment shows that by following the conclusions of this paper, the requirement of real-time performance can be satisfied in the distributed control system.

中图分类号: 

• TM769