关键词: 网络控制, 带宽分配, 交换式以太网

Abstract: One of the main problems of applying the switched Ethernet to control applications is how to adapt it to the typical industrial communication with least changes.Considering the communication characteristics of the control network，this paper proposes a distributed bandwidth allocation strategy based on the time-slot.Models of communication tasks and bandwidth resources in the network control system based on switched Ethernet together with the control methods of the message transmission and the scheduling algorithm of the strategy are introduced.Existing distributed scheduling proposals often cannot deal with the situation that communication tasks change frequently and both schedulable ratio and bandwidth utilization are low.By the experimental analysis and comparisons，the proposed strategy guarantees the transmission of the real-time communication tasks with their deadlines，and furthermore it solves the above problems of existing proposals.

Key words: network control, bandwidth allocation, switched Ethernet