Integration slave node device of Profibus-DP (profibus-data processing) and Modbus

Abstract

The invention provides an integration slave node device of Profibus-DP (profibus-data processing) and Modbus. The integration slave node device comprises a protocol processing and communication interface unit and a protocol switchover and RS-485 interface unit, wherein the protocol processing and communication interface unit is based on a microprocessor STC90C51RD+, and is used for processing complete communication protocols of Profibus-DP and Modbus, setting a node number of SPC3 (communication protocol chip 3), accomplishing the data communication between the microprocessor and external equipment, and providing a power supply for the whole device; and a SPC3 protocol chip accomplishes the process to the Profibus-DP communication protocol; a slave station protocol switchover circuit accomplishing device switches between the two protocols; and the power supply at the RS485 interface driving side is isolated from the power supply of a master device by an optical coupler isolating circuit. The slave node communication device provided by the invention has a good generality; when any one of the field buses such as the Profibus-DP or the Modbus is selected for industrial network control, the field equipment such as a frequency converter, a sensor, a PLC (programmable logic controller) and the like can be accessed into a field bus control system conveniently through the device.

Description

technical field [0001] The invention relates to the technical field of industrial network communication, in particular to a slave node device of two industrial field bus integration technologies of Profibus-DP and Modbus. Background technique [0002] The field of industrial network communication has always been a hot spot of research at home and abroad. The development of Profibus-DP and Modbus field bus technology is also quite mature, and they have formed their own standard communication protocol specifications. [0003] At present, PROFIBUS occupies more than 30% of the fieldbus market in my country, ranking first among various fieldbuses, and its application fields cover automobile manufacturing, textile, papermaking, traffic signal system, food, chemical industry and electric power and other industries . PROFIBUS is currently the most widely used fieldbus system in the world. PLC products and automation equipment products of most manufacturers in the world provide PROF...

AI Technical Summary

Problems solved by technology

[0005] At present, in order to connect industrial equipment to an industrial field bus, the traditional method is to connect the equipment to the industrial field bus through a slave station that conforms to the bus standard. For different standards of industrial field bus, different slave stations are required. Node devices, which cause those companies that use multiple fieldbuses to purchase multiple slave node devices, resulting in increased costs, and it is not easy for industrial equipment to be connected to the fieldbus

Images