| Fieldbus, one of the leading technologies in today's automation area, is characterized as Computer Local Area Network in automation field. LON is a Local Operating Network put forward by Echelon Corporation in March 1991, and offers a powerful means for distributed control system. Under its support, a new generation of intelligent and low cost field test control product comes into the world. To support LON, Echelon Corporation develops LonWorks technology, which provides a suit of developing platform for designing LON bus and making it into products.First, this paper discusses basic concepts of fieldbus, background of this subject, and the major work of the author. Aiming at the need of developing Intelligent nodes, this paper introduces the core technology of LonWorks in detail, including the Neuron chips, firmware of Neuron Chips, the transceiver chips, LonTalk communication protocol, Neuron C language, the common developing tools of LonWorks, and basic applications and development technologies of LonWorks.According to the introduction of these theories, the paper puts forward a total design of a kind of powerline intelligent node, including both hardware and software realizations based on LonWorks technology. First of all, the paper gives the reason for how to choose the devices, and the particular data of several key chips. Then it dissertates detailedly the design methods of each function circuit, and sets forth the design methods of Neuron C application software of intelligent node according to the LonMark Standard. At last, it points out the problems in the progress of designing the circuit and the software.According to this Intelligent node, the author designs a data collection, transportation and control system, detailedly discussing the communication theory, the hardware structure, and the functions of each parts of this system. Then it tests and analyzes the system.Finally, the paper analyzes the advantages and weaknesses of this design, and... |
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