| Networked control system is the main way of the control system in the time of information, and the independent development of controlled network node is the key point of the development and application of networked control system. The controlled network nodes in the networked control system are interconnected via communication media according to certain communication protocols. And the performance of the system is not only depending on the design of the controller, but also it is closed related to the structure of protocol stack. Because of the competition of fieldbus technologies in different industrial control fields since 1990s, various fieldbus standards exist. And it becomes the urgent affairs to realize the interconnection and interoperation between various fieldbuses. Therefore, it is very important to research the reconfigurable protocol stack of controlled network nodes.After introduction the origin of this task and the significance of modeling and evaluation of reconfigurable protocol stack in controlled network nodes, we analyze the technology of reconfiguration, communication protocol and modeling and evaluation of reconfigurable protocol stack first. Then we expatiate on the theory of reconfiguration, the concrete implementation method of reconfigurable protocol stack, and the example of reconfiguration of controlled network nodes communication protocol stack using genetic algorithm. Following, we present the method of modeling, evaluation and implementation on controlled network nodes reconfigurable communication protocol stack, including the traditional modeling way, the disadvantages, our new modeling thoughts and some contents about evaluation of protocol stack. At last, we model and evaluate HSE using our modeling thoughts, and the feasibility and validity of the thoughts are validated.A summary is given at the end of the thesis, and problems to be further improved or continuously researched are discussed. |
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