Research On The Integration Of Industrial Fieldbus System Based On OPC

Fieldbus Control System (FCS) has become the new development direction for its openness, decentralization and interoperability. However, because of the consideration of self-interest of each group supporting fieldbus technology, there has been a fact that many different fieldbus protocols should be coexisted at the same time. With the wide application of FCS in industry enterprises, the interchange of information among different fieldbus protocols for enterprises has been very urgent. Thus the practical meaning in project to study and solve the integration of different FCS is very important. This paper mainly researches the application of OPC technology in FCS. In this paper, it developed an OPC DA server and a client, and realized the integration of different FCS based on OPC through research on COM principles and OPC technology criterions.At first, this paper introduces the technological characters of fieldbus, the current states and trends of FCS, and expatiates some schemes of fieldbus integration, including the integration among traditional DCS and FCS, different FCS, FCS and information network. Then, it goes into particulars the foundation of OPC technology—COM/DCOM principles and OPC DA technological criterions. And an OPC server and a client were developed and tested separately based on the above theory. Finally, an experiment, the integration of Devicenet, ControlNet and Profibus-DP was done, to prove the practicability and validity of OPC technology.