Based On Delay Analysis And Experimental Platform In The Lon Bus

It is essential for Fieldbus technology to have real-time performance, which completely changed the traditional control system architecture. In order to meet the process control transmission speed and fast response time, on-site information is normally used a short frame, which can effectively deal with unexpected cycle of services and non-cycle services, with the upper limit of response. However, delay is inevitable. An analysis of end-to-end delay was the primary task when designing a networked control system, which determining whether or not to meet the real-time requirements. End-to-end delay is affected by the network load, network protocols, network transfer rate and packet size, and many other factors, which showed fixed, randomized, bounded or unbounded characteristics, time-delay is the most important issue of selecting control strategyThis article initially analysis of the LON network MAC layer of the arbitration mechanism-the predicative of the P persistence CSMA mechanism. The LON bus service performance indicators were compared, with the result its application advantages under adverse circumstances. Secondly, a MAC layer for the LON network delays modeling method was given. The method is based on the stochastic control theory and signal flow diagram, which derived the LON bus end-to-end delay characteristics. Simulation results show the effectiveness of the model for quantitative system performance analysis provides a theoretical reference. Finally, develop a test platform for LON Bus and LON-bus real-time simulation module, in order to meet the needs of teaching and real-time performance of the LON bus research The experimental platform designed to meet the students to design their own the experiment content. Using Visual c ++ to develop a LON bus control system real-time simulation module, to resolve the LON bus system design simulation tool for real-time requirements.