讨论了工业以太网构成分布式系统的可行性和优点，分析了4种满足分布式控制的工业以太网协议及其各自的优缺点。提出了设备制造商为支持这些协议在产品中增加以太网连接必须考虑的内容和实现途径。

Feasibility and use of Ethernet in distributed system are discussed. Four industrial Ethernet protocols, which meet the requirement of distributed control, are analyzed, and so are their relative advantages and weakness. The things the device vendors should consider to support these protocols and the means to add Ethernet connectivity to their product are proposed.