The Application Research Of OPC Technology In The Fieldbus Control System

The development of information technology at very fast speed brought forth the construct change in automatic systems and gradually form corporation information system basing on the automatic system of network integration. But when a great deal of field information come into the supervise computer from brainpower instruments or send to supervise computer by fieldbus, there are enjoying and communicative problem during the applying programs of computer. On the other hand , field-control layer ,as the ground floor of corporation information system , must be integrated with manufacture process managing layer and operating layer. So there are question about the supervise computer how to communicate with other computers.Under the Microsoft 's cooperation and the guiding of the OPC foundation, OLE(OLE for process control)was established as the interface standard of the automatic field by the leading manufacturers of the automatic field all over the world. It was based on the OLE technology standard and designed for the information alteration of the process control software . According to the developing trend of the OPC technology based on Web technology and the data transmission of striding regions and different operating platforms , the subject come out using internet to settle the real-time transmission problem of the field-device data and state the relevant designing methods and realizing steps using ActiveX control technology and ASP.NET technology. The key exploitation technology of keeping and getting data of server has been studied in the article based on the OPC standards and the relevant COM/DCOM technology, and open out the client application program which having simple ability of keeping and getting data. According to the program ,set forth the exploitation and realizing methods of the OPC control of keeping and getting data and trendy picture display and the alarm control, subsequently introduce how to set the control in the ASP page , how to release the ASP page through the Web server and realize browsing real-time measured data in IE browser.Today internet has been penetrated into various aspects of society, also in industrial control field. It was the OPC developing trend in future that the OPC data were opened to application programs of internet, strengthening the function of OPC tolerating electric business of application program, providing the ability enjoying real-time data in process of manufacture in the whole corporation environment.