Title :
A new real-time Ethernet for numeric control
Author :
Wang, Ke ; Zhang, Chengrui ; Ding, Xinzhong ; Ji, Shuai ; Hu, Tianliang
Author_Institution :
Key Lab. of High Efficiency & Clean Mech. Manuf., Univ. of Shandong, Jinan, China
Abstract :
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.
Keywords :
carrier sense multiple access; factory automation; jitter; local area networks; network interfaces; numerical control; telecommunication congestion control; CSMA; EtherMAC; carrier sense multiple access; collision detection; logical link control; manufacture automation control; master-slave communication structure; network interface card; numeric control; real time ethernet; synchronized latch signal jitter error; Clocks; Delay; Ethernet networks; Jitter; Latches; Real time systems; Synchronization; Ethernet; NC; Real-time;
Conference_Titel :
Intelligent Control and Automation (WCICA), 2010 8th World Congress on
Conference_Location :
Jinan
Print_ISBN :
978-1-4244-6712-9
DOI :
10.1109/WCICA.2010.5553976
