For project of Xinjiang 6th Agricultural Division, the screening & grinding system and its fan can be precisely adjusted by ABB converter. The speed of motor can be adjusted as per discharge particle and dust size to meet the production capacity. Schneider’s Low-voltage components are used as system control components in order to reduce the part failure rate and improve the reliability. GM’s GE RX31 PLC series are used as control core components, they have high accuracy, data processing ability as well as good reliability etc. Powerful IFIX upper monitoring control software can quickly collect PLC data, process them and do process monitoring, control, alarm, report as well as data archiving.