标题：A new Real-time Ethernet for Numeric Control
作者：Wang, Ke; Zhang, Chengrui; Ding, Xinzhong; Ji, Shuai; Hu, Tianliang
作者机构：[Wang, Ke; Zhang, Chengrui; Ding, Xinzhong; Ji, Shuai; Hu, Tianliang] Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mech Mfg, Jinan 25 更多
会议名称：8th World Congress on Intelligent Control and Automation (WCICA)
会议日期：JUL 06-09, 2010
来源：2010 8TH WORLD CONGRESS ON INTELLIGENT CONTROL AND AUTOMATION (WCICA)
关键词：Real-time; Ethernet; NC
摘要：This paper reviews real-time (RT) Ethernet and discusses special requirements for numerical control (NC). Then such a real-time Ethernet - EtherMAC (Ethernet for Manufacture Automation Control) is presented. EtherMAC uses master-slave communication structure. The master device supports standard Network Interface Card (NIC), and the slave device has a modified one - removing CSMA/CD (Carrier Sense Multiple Access / Collision Detection), changing logical link control (LLC) etc. EtherMAC's mechanism such as time-deterministic communication and synchronization is shown which is mainly controlled by the first node's sync frame. Besides, this paper analyzes its real-time performance and some drawbacks. At last, after an experiment which indicates that the synchronized latch signal's jitter error is random with boundary, some improvements are given based on the formula of the maximum jitter.