Profibus and Ethernet protocol conversion device

The invention provides a protocol conversion device of a Profibus and an Ethernet, and belongs to the field of industrial Internet of Things. The device comprises an Ethernet module which is connected with a core module through a media independent interface; the Profibus module is connected with the RS485 module through a 485 signal interface and is used for receiving and transmitting 485 signals through an electric port; the Profibus optical transceiver module is connected with the microprocessor module through a serial port and is used for receiving and transmitting Profibus optical signals through an optical port; the RS485 module is used for receiving and transmitting an electric port signal of the Profibus; the microprocessor module is respectively connected with the Profibus module and the RS485 module through serial ports, is connected with the core module through an SPI (Serial Peripheral Interface), and transmits a Profibus signal to the core module; and the core module is used for carrying out mutua