| The development of system integration of Intelligent Building goes through from DCS to Fieldbus and then OPC. OPC technology based on Microsoft COM/DCOM becomes the base of integration between control tier and manage tier through providing the plug and play "Software bus", every system and every equipment can be connected and communicate between each other, OPC can realize real opening and convenient communication between control tier and manage tier.Nowadays, due to wide use of Web Services, the demand of remote control and monitor, maintenance and management, which is based on Web services, is often cried for in the field of Intelligent Building. To meet these demands, OPC Foundation OPC releases OPC XML-DA Specification Version 1.0 by which remote clients can easily access locale devices data over Internet. The Specification overcome the shortcoming of Early specification, OPC DA and OPC DX, which are unfit for client to access locale devices data over Internet.On the basis of the study of the aim, model and mainstream technology of system integration of Intelligent Building, the thesis analyses the problems of the system integration of Intelligent Building now. The thesis also studies the specification of OPC XML DA, brings out a application model of system integration of Intelligent Building based on OPC XML, studys the design aim, structure and technology trait of the model, and researches the implementation of OPC XML Web services, which is the kernel of the model. The thesis designs a OPC XML Web services to access OPC COM server which is a provider of the devices data in low tier, and designs a OPC XML DA client application that can flexiblely integrate these Web services, achieve the aim of system integration of Intelligent Building.OPC XML technology improve the interoperability of system, simplify the environment of integration, implement share and exchange of information , meet the demand of integrative integration based on Internet. |
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