Research And Verification Of Wireless/wired Heterogeneous Network Integration Architecture Based On Double Token

With the development and application of wireless network technology in the industrial fields, networked control systems are no longer limited to wired fieldbus and industrial Ethernet technology. Wireless network technology can be applied to control network systems at field device layer and control layer, which achieves an open hybrid wired/wireless field measure and control networks with industrial-grade reliability and real-time performance. It’s a major application mode and future developing tendency for the application of wireless communication technology in industrial controlled network systems. Therefore, the research of models, methods, performance for the integration of industrial hybrid networks, has important theoretical significance and application value.This thesis focuses on the integration architecture and performance evaluation of the industrial wired/wireless hybrid networks based on double token. The contents and results of the Wireless network architecture and the overall time performance are studied and tested in laboratory. The main research works are summarized as follows:The topology and protocol stack model of wireless industrial control network (WICN) token ring network are researched, and the network operation mechanism and token cycle time is the focal point. Improve the original token control mechanism, and introduce the token fault recovery mechanism, to achieve the free entering and exit of WICN subnet site; multi-token heterogeneous system can transfer optimizing, exchange data, reduce and avoid the conflict of information network, improve the real-time performance of the wireless network as possibly.Centering on the of industrial wired/wireless heterogeneous network, Especially focusing on the research of industrial real-time gateway, the data synchronization update delay model and data dropout model are built, in the case of low-speed and high-speed token segments with the backbone respectively. These works provides theoretical basis for the study of integration performance and the development of key equipment in hybrid wired/wireless network. The token cycle synchronization strategy is proposed according to multi-token integration situation, which provides the design basis for reducing network delay and improving delay stability of hybrid network integration, which provides method basis for design of protocol conversion gateway.Based on the hybrid network system platform, some performance parameters tests about real-time communication, protocol conversion, network delay, etc, are carried out for the research of hybrid integration gateway model, gateway optimization, wireless access, etc. All the work provides the basis for the implementation of hybrid network system prototype in the industrial field.