The Research Of A Node For Lighting Control System Based On LonWorks Technology

The intelligent illumination control system is the application and popularity of automation technology in the field of illumination control. It is not only the effective realizable methods of aesthetical and comfortable light but also accordance with the "Green Illumination" and its direction of development that is an approval of saving energy and alleviating energy crisis, so that it has a promising brilliant prospect. Field-bus, a communication network for connecting equipments in field and automation system, has lots of prominent features such as totally digital transmission, distributed control function, opening system.LonWorks technology is a new-style fieldbus technology. LON bus which is a kind of the most popular fieldbus has been used in building,traffic, energy sources and so on. LonWorks technology gathers computer, network and control, integrates LonTalk protocol with all seven layers of ISO/OSI, and realizes communication and control functions, being flexible in grouping and good at opening. The dissertation discussed the application of LonWorks in illumination control, analyzed the system construction of the distributed intelligent control based on LonWorks, designed an experiment system of intelligent illumination control system based on LonWorks. The main content of dissertation is listed as followings:According to the various equipment of illumination extensively distribute dseparately, concerned the advantages of LonWorks in layer of field equipments, the dissertation analyzed the network construction of distributed intelligent illumination control system based on LonWorks and the different type of LonWorks conjunctions and their characters, functions, and requirements. Furthermore, anexperiment system has been presented to realize the distributed intelligent illumination control system based on LonWorks.Neuron 3120 were choosed to design different LonWorks conjunction such as intelligent delay, intelligent adjustment of lighting, intelligent key-press, etc, which realized the hardwares of experiment system. The I/O modes of Neuron 3120 were in charge of gathering input signal of keys, and driving the LED and the winding of delays. The A/D modes gathered current and voltage signal, the adjusting lights modes realized how to adjust lighting,and the LonWorks mode took the responsibility of communication between all joints of LonWorks.The control functions and communication functions of intelligent delay and intelligent adjustment of lighting realized by software design of the experiment system, programming mostly with Neuron C language, and assembly language also embedded when reaching its advantages.