Study of Hard Real-time Communication in Distributed Control System

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.