Fieldbus is a type of new technology and new standard. It will foster a revolution to automation. Essentially, fieldbus has brought us full-open architecture, full-digital communication network, full-intelligent field instrument and full-distributed control solution. These assure its interoperability, scalability, excellent performance of digital communication, truly distributed hazard and enhanced security. It will bring the fifth generation of process control architecture, which is developed based DDC and DCS, but changed for its nature. The interface between the applications of filedbus systems should be standardized, too. It should fit the full-distributed system, and the requirement of industry data exchange. The OLE/COM technology comes with the network computing and distributed system. The Component Object Model has brought new system and network oriented idea for the development and design of application. PC, Windows 95/NT, and Windows based application are creeping into the industry control field. And the protocols for data exchange between Windows based applications are used for data transfer. OPC, OLE for Process Control, is developed and established by Microsoft and some other large automation corporations. Its goal is to develop an open and interoperable interface standard, based upon the functional requirements of OLE/COM and DCOM technology, that fosters greater interoperability between automation/control applications, field systems/devices, and business/office applications. It will fill the blank of API in the filedbus protocol. The main contribution of this dissertation is as follows: 1. The conception and its essential signification of fieldbus are introduced. And its history is overviewed from the technology development process point. The effect on DCS is analyzed, too. Its benefit to customer and market is presented. And its status quo is introduced briefly. 2. The inevitability of fieldbus's coming into being is analyzed from the history of process control architecture. And it will bring the fifth generation architecture, which integrated the benefit of the third and the fourth. The new generation is a kind of architecture with three levels structure and two levels network, which will bring new idea to the integration of plant control and management system. The structure of fieldbus control system is given, and analyzed from the application and function points. 3.The tendency of PC, Windows and its application creeping into industry automation systems is analyzed. And the interface models between filedbus system and Windows based application are presented. The OPC model is a kind of standard interface model which fit fieldbus control system. The conception, application of OPC and the content of OPC Specification are introduced. 4. The history of OLE is introduced briefly. It is a particular technology fo
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