討論了Profibus DP 協議功能在以太網上實現的可行性，對基于以太網的實時協議進行了改進。改進的實時協議基于以太網數據鏈路層的LLC 子層，使以太網可以適應實時通訊的要求能夠應用于設備級，并且與已經存在的Profibus DP 現場總線上的應用保持了兼容性。還介紹了協議的實現和性能分析。
關鍵字：Profibus DP；以太網；實時協議；LLC
Implementation of Profibus DP Protocol on Ethernet LU Chao，ZHANG Xi-huang (School of Information Engineering, Southern Yangtze University, Wuxi 214122, China)
Abstract：This paper investigates the possibility of implementing Profibus DP functions on Ethernet and proposes a method to improve the real-time protocol based on Ethernet, referring to this implementation. The real-time protocol is based upon the IEEE802 Logical Link Control sublayer of Data Link layer of Ethernet to satisfy the requirement of real communication at the device level in factory automation systems and maintain the compatibility with already existing Profibus DP applications. Moreover, some performance figures of real-time protocol are analyzed and the results of some
simulation tests are given.
Key words：Profibus DP；Ethernet；Real-Time Protocol；LLC