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PLC principle and application is a kind of theory and practice, engineering practice of the professional course. Among them, PLC experimental teaching is an important part of the course. Many Chinese universities opened the PLC curriculum, teachers use experimental board to describe the whole process in PLC experiment teaching, the operation effect of the board is using light-emitting diode (LED) to simulate the. As a result, the running state of the experiment is very abstract, not intuitive, and it is difficult to feel the reality of the state, it is difficult to understand the students to absorb. The design was constructed to simulate real environment of the demo system, using the Siemens S7-400 PLC as the main station controller and PLC of Siemens S7-200/300 is from the station controller with EB8000 human-machine interface, PROFIBUS-DP communication, RFID technology and four degrees of freedom for the sorting machinery to achieve mail classification sorting monitoring. The system should be able to achieve different PLC hardware networking, communication and monitoring and other functions, so as to achieve the intuitive, flexible and participatory experimental teaching. The system solves the problem of the replacement of the controlled object, and the running process is vivid, and the reality is very strong. Therefore, students can be able to solve the PLC experiment to learn to be able to do the theory with practice. Keywords—RFID technology; Programmable logic controller ; PROFIBUS-DP communication

Design Demonstration System of SIEMENS S7 Series PLC Network Based on PROFIBUS