| With the development of TCP/IP based Internet and information technology , information exchanging has been the tide of information technology,and industrual network is also developing this way. This paper has analyzed and studied the structure of network control system as well as developing method of embedded system,And have introduced basal principle and method of embedded intelligent-unit which is based on embeded operating system and fast Ethernet, studied and designed the realization of hardware and software of the intelligent-unit and Ethernet communication. Intelligent-unit's processor is INTEL XSCALE 255 with the core of ARMv5TE.With its multi-interface and powerful real-time processing ability the intelligent-unit can make connection to many types of i/o devices and its EVA_C210 provide the wayout to Ethernet.The operating system is enbeded linux which kernel code is opened and the development tool is cross compiler. The intelligent-unit can provide a realiable and fast connection between native area equipments and distence hosts.This make it very easy to build intelligent distributed control system. |
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