Profibus automation technology and its application in DP slave development

According to ISO/OSI preference model, the structure of the communication protocol of Profibus-DP is described first, as well as the data transfer technology of physical layer, the message format of data link layer and various application criterions of user interface. Based on the results of the analysis, the structure of the hardware system is presented. In accordance with the state machine of the Profibus-DP system, the workflow of the software running on the DP master and DP slave is described. In addition, a design scheme on how to develop intelligent slaves based on Profibus-DP is put forward. The results of the research work provide a solution for constructing a Profibus-DP system according to user demands.