On Profibus-DP slave station controller based on Nios II

In order to promote the development and application of PROFIBUS-DP in domestic industrial control process, in order to improve the reliability, anti-interface and low-power of the control system, an embedded PROFIBUS-DP slave station controller based on NIOS II has been designed in this paper. A chip of FPGA is selected as the hardware on which the controller has been realized. NIOS II CPU embedded in the FPGA is adopted as the processor which coordinates the other circuits to finish the control task. The PROFIBUS interface is designed in the FPGA as an IP core using VHDL program. The IP core is mainly composed of UART interface, FDL (field-bus data link layer) protocol processing module and NIOS II CPU interface. Applied in batching system for experiment, the controller represents satisfied performance.