科创中国

原文链接：万方

• 摘要：

  As the popularization of dual ring fieldbus,the optimized dual ring synchronization methods are still in short.The current synchronization methods are generally established in traditional industrial fieldbus,in which transmission is commonly considered in single track,the two-way transmitting cannot take full effect,and would result in unwanted idle load on equipment lines.In stamp-transferring part,the synchronizing algorithm is not properly processed to diminish the latency,so the real-time performance of entire system cannot be ensured.To support the synchronization control of stations in the CNC system,a real-time time synchronization method for dual ring fieldbus in the CNC system is designed in this paper.In this method a synchronizing message transmission scheme based on dual ring architecture and the synchronization algorithm between master and secondary stations are integrated.In the scheme,the clock models of both master and secondary stations are optimized with corresponding modules and the stamp data transmission based on the dual ring fieldbus is devised exclusively,so the transmitting efficiency improves with less idle work.In the algorithm,all the secondary stations can accomplish the consistent state with master station by updating clock discrepancy information in one communication cycle,and it takes the advantage of two-way transmitting and makes the best use of dual ring structure,so the real-time performance of the system can be promoted while retaining the precision of synchronization.To evaluate the performance,the costs of the method and errors during synchronizing are noted and analyzed based on the actual running environment in the industrial fieldbus.The results show that it reduces communication cost and ensures the smoothness of the system with low lag effects under heavy load.The proposed time synchronization method optimizes the architecture of sync message transmission in dual ring fieldbus,and improves the efficiency of time synchronization in the stations of CNC system.

• 关键词：

  time synchronization dual ring fieldbus real-time system CNC system

• 作者单位：

  School of Computer Science and Technology, University of Science and Technology of China, Hefei 230027, China%Shenyang Institute of Computing Technology, Chinese Academy of Sciences, Shenyang 110168, China%Graduate University of Chinese Academy of Sciences, Beijing 100049, China

• 基金项目：

  National Projects for Science and Technology Development of China(Grant2011ZX04016-071)%National Basic Research Program of China(973Program,Grant2011CB302400-G,the mathematical mechanization method and its application in digital design and manufacturing)

• 来源期刊：

  中国机械工程学报

• 年，卷(期)：

  201427001