Study On System Integration Of Intelligent Building Based On OPC Technology

With the development of computer and information technology, people need not only the pretty outline, stabilization structure and reasonable space partition of building, but also safety, comfort, exchange of information and convenience etc., thus, a new kind of building - Intelligent Building was bound out. The main character between Intelligent Building and traditional building is the intelligent, to do so, many kinds of intelligent systems was added into the building to expand the functions by the computer network, communication network and automation equipments.At the early of the Intelligent Building development, every sub-system has a small scale and a few simple control objects which can be managed by people or half automation, but with the expanding of the sub-systems scale, more and more distributed control objects and equipments, many reduplicate signal cables for voice, data and control is laid, it becomes more difficult to manage and maintain, so it is needed to manage equipments and expand functions by the integration of all kinds of equipments and sub-systems in the building.The development of system integration of Intelligent Building goes through from DCS to Fieldbus. Though the Fieldbus as the communication technology of the automation field can be built as understratum network of Intelligent Building, but with the increase of the demand of opening, interoperability and integration of control network and information network, the lack of no unified standard, bad opening, difficulty of interoperability, lack equipment, high expense and difficulty of integration was unfolded if the system integration of Intelligent building adopts Fieldbus completely.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 realized more distance, real opening and convenient communication between control tier and manage tier.Through the study of the aim, model and technology of system integration of Intelligent Building, the thesis analyses the problems of the system integration of Intelligent Building now, brought out a technique of system integration of Intelligent Building based on OPC. The thesis also studies the character and standard of OPC,designed and developed an application on system integration of Intelligent Building based on OPC.The study shows that OPC improved the interoperability between intelligent systems in building, but at the same time simplified the environment of system integration. In addition, system integration by OPC is easy to extend functions, makes the system more opening and brings us a new way of system integration of Intelligent Building.