討論了Profibus DP 協(xié)議功能在以太網(wǎng)上實(shí)現(xiàn)的可行性，對基于以太網(wǎng)的實(shí)時(shí)協(xié)議進(jìn)行了改進(jìn)。改進(jìn)的實(shí)時(shí)協(xié)議基于以太網(wǎng)數(shù)據(jù)鏈路層的LLC 子層，使以太網(wǎng)可以適應(yīng)實(shí)時(shí)通訊的要求能夠應(yīng)用于設(shè)備級，并且與已經(jīng)存在的Profibus DP 現(xiàn)場總線上的應(yīng)用保持了兼容性。還介紹了協(xié)議的實(shí)現(xiàn)和性能分析。
關(guān)鍵字：Profibus DP；以太網(wǎng)；實(shí)時(shí)協(xié)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