Research On Fieldbus Media Access Control Method

This paper has studied the media access control method of CAN bus, the meaning of the work lies in guaranteeing the timely transmission of network messages to meet the stability and reliability requirements of control systems.Firstly, the recent national and international schedule theories for the network control system were researched in group. Static and dynamic schedule theories were analyzed respectively. As to the real-time requirements of distributed real-time systems, the paper analyzed several typical static and dynamic schedule algorithms and their best application occasions in detail. Secondly, on the basis of dynamic schedule algorithms of TDMA and LLF, a new dynamic mix schedule algorithm was proposed. This dynamic mix schedule algorithm has the high foresight of TDMA. It can effectively manage and schedule the transmission of hard real-time messages in a network control system. And by using the worst-case transmission time as the standard time, the system has some fault-tolerant abilities of scheduling hard real-time messages. On the other hand, this dynamic mix schedule algorithm has the flexibility of LLF. According to...