Abstract: Oil processing is an important branch of food production department. Its automation grade is very low. Aiming at this situation, the paper presents first the scheme to develop a monitoring and control system for soybean extraction production line based on CANbus, which can make up a blank of this field, at the same time can make the product advanced and current. First, the paper gives the generic design scheme, introduces its principle and working process, then discusses detailed the hardware and software designs of CAN communication module in intelligent nodes, the design of PC/CAN communication converter based on RS-232 serial port in PC, and the development of monitoring and control software on the basis of controX2000.

Key words: CAN bus, monitoring and control system, intelligent node, PC/CAN communication converter