Study on communication scheduling of fieldbus

The communication tasks of fieldbus system often include the information transfer among the field devices. However, fieldbus is not an absolute system, which is a component of entire system. Therefore, as to fieldbus scheduling, not only the communication tasks of fieldbus but also the restrains from the other tasks in the system should be considered. In this paper, a dynamic fieldbus scheduling algorithm is used to cope with the dynamic scheduling of the task system including cyclic real-time tasks, acyclic real-time tasks, non-real-time tasks and time slot tasks under distributed multi-processor system. The model of the task system is presented and the algorithm is designed. At last, a real-time communication scheduling of computer numerical control (CNC) fieldbus system is illustrated to apply the algorithm, and the time and space cost of this algorithm is analyzed.