Design And Analysis Of Slave Interface For NCS Based On PROFIBUS

Fieldbus control system (FCS) is becoming the new generation control system after the distributed control system (DCS), which is one of the focuses in the control field now. But so far, an authoritative standard has not been setup, isolation also exists in the field of automation. PROFIBUS is one of the most popular fieldbuses currently which consist of FMS,DP,PA, and among these, as a optimized high speed connection PROFIBUS-DP is widely applied. The objective of the research is to design a high-speed and universal slave interface for PROFIBUS-DP, so an ordinary device can be connected on this bus conveniently.First, the communication principle of PROFIBUS-DP is analyzed in this thesis. According to the principle, the hardware and software design of the slave is deeply described. Under the guidance of modular design concept,elucidate how to choose application specific integrated circuit (ASIC) for PROFIBUS-DP,MCU,DPRAM and other chips. The design of circuit and the approach of software are described. Then, the message format of PROFIBUS-DP and the Network Time-delay Property is analyzed. It is proved that the slave interface can achieve reliable high-speed communication with master station and have stable performance and good universality in Communication Network of PROFIBUS.