Abstract:An wireless control system is researched based on a milling machine. The system consists of PLC,communications module,relay,touch screen,router and long-distance terminal. The control system,designed based on GE ifix and Ethernet,solves the compatibility problems with different operating systems and hardware environments. The ideas of PLC state of self-sustaining when host dropped,wireless control and local control redundancy,and control instructions prioritization are proposed. The system with local control and wireless control has been applied on the milling machine and the wireless remote control of all operations has been realized with no instruction lost and misused.