Fieldbus is a type of new technology and new standard. The coming of the filedbus will foster a revolution in the area of automation. Fieldbus has brought us full-open architecture, full-digital communication network, intelligent field instrument and full-distributed control solution. Foundation Fieldbus is a representative filedbus and has become a kind of international standard. In order to promote the development of the national industry, the project — Foundation Fieldbus Protocol Based Fieldbus Control System — was set up as the 9th 5-Year-Plan National Key Development Project. As a distributed open system in manufacturing and process control environment, FF (Foundation Fieldbus) aims to provide an international standard in this field. In order to satisfy the requirement of data transfer in industrial control, the interface between fieldbus and the program also need to pursue a standard. OPC technology is introduced to satisfy the requirement of efficient data transfer. It develops an open and interoperable interface standard between applications and fieldbus. Based on OLE/COM specification, OPC Server encapsulates the details of data transfer and provides a standard platform for clients to collect data from devices. Furthermore, based on DCOM, it becomes network available so that it is accessible by clients on remote computers. The main content of this dissertation is as follows: 1. Introduce "Fieldbus" and analyze its revolutionary significance to the field of industrial control. Point out that this new technology can bring good opportunity and pose great challenge. 2. Based on my understanding of Foundation Fieldbus Protocol in actual develop work, introduce the communication model of Foundation Fieldbus and the architecture and function of Physical Layer, Data Link Layer, Application Layer and User Layer of Foundation Fieldbus Protocol. 3. The tendency of PC, Windows creeping into industrial automation system is analyzed and the interface models between fieldbus system and Windows based application is presented by which a conclusion is gotten that OPC model is a kind of standard interface model which fit fieldbus control system. 4. Based on the 9th 5-Year-Plan Key Plan Project, User Layer interface of FF is introduced and several difficulties in designing the interface is discussed. At last, the way of implement the interface is introduced in detail combined with Foundation Fieldbus Protocol. 5. The technology base of OPC, which is COM and DCOM, is introduced. Related to the project of Multi-Fieldbus Platform, we discuss the merit of OPC in the project and analyze the interfaces and objects of OPC specification. Then the way of implement the OPC server for Foundation Fieldbus is introduced in detail. 6. A summary of the dissertation is made and future work is discussed. The 9th 5-Year-Plan National Key Development Project, which is par
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