| Fieldbuses are new developing things in the field of industrial control in recent years. For various reasons, the international standard of fieldbuses is unable to be unified all the time. The current fieldbuses are divided into several large technical standard camps, and the communication mechanism of the equipments of ground floor produced by different manufacturers has nothing in common with each other. This resulted in industrial control system's shortcoming of worse opening and flexibility directly. In this paper we want to seek an effective way to realize the seamless integration between the control systems which have different frames, in order to strengthen industrial control system's opening and flexibility.At first, the network frame of fieldbus control system is analysed from the point of view of industrial control application this paper, and we did some research on Industrial Ethernet and OPC (OLE for Process Control) technology. Secondly, we researched on and analysed the working mechanism of PROFIBUS-DP in detail, and achieved the integration of material PROFIBUS-DP control system. Finally, aimed at the fact of difficult communication between different fieldbus control systems, we put up a project to get interconnection of fieldbus systems in the layer of Industrial Ethernet by OPC technology and proved it with a concrete instance of integration.Every distributed application software can conveniently realize interconnection and mutual operation via OPC specification which is the middle component of opening industrial control system, share systematic resources with each other. Furthermore, how to develop one OPC server was presented in this paper.
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