The Research Of Building Automation System And Its System Integration Based On LonWorks Technology

The thesis is carried out on the background of the building automation control system and system integration project of an intelligent building. With the deep development of global informationization and economic internationalization, the intelligent building has already become one of the signs of national synthesized economic strength and is one of the significant developments of engineering construction in the new century. Being the most important part of intelligent building, the building automation system(BAS) has such an effect on intelligent building that its system composition and operation directly determines the success or failure of the intelligent building operation. With the rapid development of information technology and control network technology, the requisition for the function, the environment and management level of the building is rising constantly, also the scale of BAS is expanding constantly, so the system requires higher and higher reliability and flexibility, yet the traditional system of close and concentrated structure can't meet people's demands. On the other hand, present industrial control system structure is transferring from DCS (distributed control system) with the kernal idea of "central information, distributed control" to FCS (fieldbus control system). As one of the fielbus technology which was first used in the BAS, LonWorks has great advantages whether in the industrial network control, or in the intelligent building and smart home for its opening protocol. So the thesis chooses LonWorks technology to construct the building automation control system. The thesis has carried out deep analysis and discussed on LonWorks technology at first, especially deeply analyzed the message exchanged mechanism under LonTalk protocol, neuron chip and corresponding Neuron C language etc. Then, briefly introduce the composition and function of BAS, the coordination and concentration management of each subsystem, and list the national standard and professional standard which the system design must follow. The main contribution of the thesis lies in: On the base of analyzing the request of the control network of BAS, the control system structure of BAS, and the feasibility of LonWorks technology applied to BAS, the thesis has build the BAS network structure based on LonWorks by combination with the actual project; The hardware design and corresponding software design of the air conditioner control system are provided, and analyze the real-time character of system communication. The thesis also carrys out research on the system integration of intelligent building, and deep analysis to the integrated technology of the control network based on fieldbus and its integration with the information network. On the basis, the thesis adopts Visual Basic6.0 software to develop the supervisor program, sets up management and control application through OPC technology, to realize the integration between the controlling information and the management information; Finally, on the base of analyzing the function demand and design content of the actual project's realtime supervisor software, the thesis adopts Visual Basic6.0 software to design the configuration, the interface of the supervisor software is friendly and vivid.