Abstract: In view of the problem that traditional motor protector can not meet with field needs, the paper proposed a design scheme of communication-capable motor protector based on DeviceNet. It analyzed communication needs of the motor protector, built object model on the basis of functions of the motor protector and DeviceNet protocol, and used different objects to simulate functions of the motor protector. Then it allocated and built connection state of the motor protector with fined information form of predefined main and slave structure in DeviceNet protocol, realized to receive and send explicit message and I/O message on DeviceNet bus and on the basis it used DN1022 to realize design of slave node of the motor protector. The experiment result showed that the protector can communicate with the main station as node hitching on DeviceNet bus.