Design and Application of Intelligent Slave Interface Based on Profibus-DP

In order to solve the problems that some current intelligent equipment can not communicate with the fieldbus system,and analyzed Profibus-DP protocol,proposed a development plan of Profibus-DP intelligent slave interface taking a microcontroller and Profibus protocol chip as the core components.Used single-chip microcomputer ATMEGA162 to handle the user program and used VPC3+C to implement Profibus-DP protocol,through the RS485 driver chip ADM2486 and RS232 serial level transition chip MAX232,executed conversion between Profibus-DP fieldbus protocol and RS232 serial port protocol,realized connection between RS232 intelligent equipment and fieldbus.The slave interface has been applied in product tracking system,the using results show that the slave interface improves the transmission speed of data exchange,in the case guaranteeing the stability and reliability of communication between intelligent equipment and fieldbus.