Abstract: The paper describes briefly the industrial Ethernet communication technology and highlights the hardware composition, software composition and connection of system communication of the control system of Tai Steel Ekou Iron Pelletizing Plant. Siemens PLC is used to form the site-level control system which is realized by Siemens S7 software. With Simatic Wincc as the configuration software of the upper system and by adopting Ethernet communication technology, the various site data and parameters are displayed in real time, realizing the control of the remote upper computer over the site-level control system. This network has been running stably and reliably since putting into use, with a zero fault rate, well satisfying the requirement of a rapid real-time control of the process.

Key words: Ethernet, Wincc, CSMA/CD mechanism, OSM, MAC address