文章介绍了一种基于以太网的分布式开关量I/O接口设备,该设备能够利用现场工业以太网组网将开关量信号采集并通过以太网传输至上位机,同时具有将以太网数据转换为开关量数据的功能。与传统总线式开关量I/O接口相比系统的实时性与通用性得到提高,该设备具有了Ethernet传输可靠和维护简单的特点,在工业生产监测监控中具有一定的使用价值。 This paper introduces an Ethernet-based distributed switch I / O interface device, the device can use on-site Industrial Ethernet networking switch signal acquisition and transmission to the host computer via Ethernet, at the same time with the Ethernet data conversion For the switch data function. Compared with the traditional bus switch I / O interface, the real-time and versatility of the system is improved. The device has the advantages of reliable Ethernet transmission and simple maintenance, and has certain value in industrial production monitoring and control.