A token-ring-like real-time response algorithm of Modbus/TCP message based on mu C/OS-II

作者：Sun, Jinhao^*; Zou, Fang; Fan, Shangchun

来源：AEU-International Journal of Electronics and Communications, 2016, 70(2): 179-185.

DOI：10.1016/j.aeue.2015.11.002

• Modbus/TCP
• Industrial Ethernet
• mu C/OS-II
• Real-time
• Token ring

The Modbus/TCP protocol cannot guarantee the real-time capability. A token ring scheduling algorithm that featured by priority to provide the real-time response to the Modbus/TCP messages is designed. The average response delay on a mu C/OS-II+ARM7 platform is 1.117 ms, which is better than most average response delay reported in current researches that aim at improving the real-time performance of Modbus/TCP, and, it reaches the level of Powerlink working in open mode. Finally, a weighted token ring scheduling algorithm and a weight-variable token ring scheduling algorithm are proposed. The two algorithms can meet the demand of customizable and changeable time delay in advanced application.

• 出版日期2016
• 单位北京航空航天大学; 中国航空工业集团公司北京航空制造工程研究所