Abstract: Introduced the ore-milling classification technology of a gold processing plant in Yunnan.According to the actual situation of the concentrator,Designed the control system based on S7-300 PLC and Wincc software.The structure of the system,PLC hardware and software design,and the major control method were given.The results of operation indicated that the control system offered high precision,quick adjustability,strong anti-interference capability and better stability,automatic control of the mill ore-milling classification was achieved.

Key words: Ore-milling classification, S7-300PLC, Wincc, Monitoring system