【摘要】 计算机通讯网络在工业自动化领域中的应用十分广泛，宝钢三期原料场控制系统采用以大网和Ｇｅ－ ｎｉｕｓ网组成两级计算机通讯网络。本文结合该控制系统的建设，简要介绍了ＩＥＥＥ８０２．３ＣＳＭＡ／ＣＤ以太网与 ＩＥＥＥ ８０２．５令牌环网的主要技术指标，详细论述了两级计算机通讯网络的工作原理、网络部件和系统构成。更多还原

【Abstract】 Computer communication network is widely used in industrial automatic control area. The control system in Baoshan Iron and steel Corp. Third Phase Raw Material Yard (TPRMY) takes use of Ether and Genius two-level computer communication network. Combined with its construction,this paper briefly introduces the main technological characteristics of IEEE 802. 3 CSMA/CD Ethermet and IEEE 802. 5 Token Ring network,emphatically narrates the working principle, network components and system structure of the two-level communication network in TPRMY control system.更多还原