Abstract: The automatic complex shape tube steel skeleton seam welder is one of the main equipment for manufacturing reinforcing bar skeletons,and it has many motors and many inputs and outputs,which need controlling,and its motors include stepping motors and three phase asynchronous motors.Based on 485 bus and ZigBee wireless transmission technology develop a high reliability of the rolling machine control system that each execution of both institutions based on 485 bus is independent of the underlying controller,motion control function and I/O control functional separation.Use ZigBee wireless transmission technology to achieve the rolling main welding disk on the wireless control of the 48 motors,both to avoid the motor with rotating mechanism of wiring problems,but also to meet the basic demand of control system.It can control seam welder to weld steel skeleton automatically,show the process graphically,collect and display the relevant data,execute fault alarm.Experimental results indicate that the control system can run steadily and reliably,and the methods proposed in the system are practical and popular value.

Key words: seam welder, control system, 485 bus, ZigBee technology