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Tham khảo tài liệu 'wind energy management part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The Design and Implement of Wind Fans Remote Monitoring and Fault Predicting System 69 OPC OLE for Process Control technology comes into being in such a development background. OPC technology is an interoperability standard of industrial control software made by OPC foundation and also a technology introduced jointly by the control fields and the Microsoft Company aiming at apply Windows to the control system. Based on the component object model distributed component object model COM DCOM technology of Microsoft it defines a set of standard interfaces for industrial control software. Through these object interfaces it realizes the standardization of the data exchange between applications which greatly enhances the openness and interoperability between automated equipments. OPC technology demands that hardware manufacturers must provide both equipments and OPC servers with standard communication protocols while providers of SCADA system software provide client programs in line with the standards of OPC thus SCADA can connect to OPC servers seamlessly. OPC interface can be applied to the lowest level of applications. That is through this interface the real-time field data can be gathered and transmitted to DCS or SCADA system. Also by using this interface we can transfer the data from the DCS system or SCADA system to the application software of upper layer. This contributes to the integration of management and control and is beneficial to the computerized management of enterprises. Under OPC Client visit data in field data server through identical data access method. Though OPC servers may be offered by different software manufactures an OPC Client can be connected to one or more different types of OPC servers. The structure of OPC applications is as follows Fig. 5. OPC application program structure 3.2 The design of data acquisition system of front-end computer in wind farms Since OPC defines a set of interface access methods based on the Microsoft OLE COM or DCOM
