基于Ethernet的嵌入式测控系统的设计

Design of Embedded Measurement and Control System Based on Ethernet

在分析工业控制网络发展趋势、嵌入式以太网接入Internet网络数据传输需要的协议的基础上,针对现场总线通信方式的不足,设计了一个基于Ethernet的嵌入式测控系统。文章阐述了系统的设计方案,在硬件电路设计上,重点介绍了测控系统数据采集节点设计和以太网通信接口电路的设计;在软件系统设计上,提出测控终端软件设计方案,并实现了基于TCP/IP协议栈的网络通信设计。实际使用表明,该系统运行灵活、可靠、稳定,可直接使用企业内部的Intranet信息网,也可直接接入现行的公共Internet网络。

Based on the analysis of development trends in industrial control network and protocol for data transmission between embedded Ethernet and Internet, this paper presents an embedded measurement and control system based on Ethernet to make up for the deficiencies in communication mode of fieldbus. A detailed description of the design proposal, which contains hardware circuit design and software design is demonstrated. Design of data acquisition node on measurement and control system and Ethernet communication interface circuit are introduced when presenting hardware circuit design, while design of terminal software and realization of network communication based on TCP/ IP protocol stack are introduced when presenting software design. Tests on actual operation shows that the system is flexible and robust, and it can not only directly use enterprise network, but also access to Internet.