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

fYear

2010

Firstpage

4137

Lastpage

4141

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Control and Automation (WCICA), 2010 8th World Congress on

Conference_Location

Jinan

Print_ISBN

978-1-4244-6712-9

Type

conf

DOI

10.1109/WCICA.2010.5553976

Filename

5553976