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计算机通信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太网和Genius网组成的两级计算机通信网络，本文结合该控制系统的建设，简要介绍了IEEE802．3CSMA／CD以太网与IEEE802．5令牌环Genius网的主要技术指标，详细论述了两级计算机通信网络的工作原理、网络部件和系统构成。
Computer communications network in the field of industrial automation is widely used. The Baosteel Phase III raw material yard control system uses a two-level computer communication network composed of Ethernet and Genius networks. In this paper, the main control system of IEEE802.3CSMA / CD Ethernet and IEEE802.5 Token Ring Genius Technical indicators, a detailed discussion of two levels of computer communication network working principle, network components and system components.