The master and slave configuration monitoring system based on DeviceNet is designed and implemented in this paper. The monitoring software communicates with the master station by using a custom protocol via the serial communication module. Variety information of main station such as the master/slave configuration and parameter values will be transferred from the station to the communication module. The above information is sent to the slave module by the master communication module via standard DeviceNet protocol. Monitoring software can request and obtain real-time information from the slave station, then take appropriate action. The experimental results show that the data communication satisfies the specification of DeviceNet, the configuration software can configure and monitor the communication status of DeviceNet bus.