This article introduces a fieldbus junction and Ethernet application case to illustrate the application of fieldbus, which provides convenience for site management level access to field data. In this case, the bottom layer adopts the PROFIBUS-DP bus protocol, and the field instrument data is collected by the industrial computer. The upper layer adopts the TCP/IP protocol, and the interface communication program is used to let the industrial computer exchange data with the management computer in real time. 2, system configuration diagram The main bus technology of this system realizes all the functions required by customers with one industrial computer, which reduces the cost and is easy to maintain. It is the product of the perfect combination of bus and computer. The emergence of fieldbus technology has made the level of industrial production automation substantially improved, in line with the needs of industrial control network and informationization, and thus has a good development prospect. The complete digitization of industrial automation systems and the further adoption of certain standards are the basis for the implementation of fieldbus technology, so its initial investment is relatively large. Fieldbus is one of the hotspots in the development of technology in the field of automation today, and is known as the computer LAN in the field of automation. Its emergence marks the beginning of a new era in the field of industrial control technology and will have an important impact on the development of this field.
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1. System characteristics Bus mode: Since the collection points are located in the various process workshops of the entire production line, they are relatively scattered. Therefore, through the form of bus, distributed I/O can save a lot of cables, facilitate construction, facilitate centralized management of debugging and maintenance: the system monitors the instantaneous value of each energy collection amount through an industrial computer, and passes another application. The program calculates the cumulative amount, and periodically sends each accumulated amount to the superior management computer system cross-platform: the industrial computer runs the Windows2000 operating system, in which the Think&Do monitoring software is run for real-time monitoring of instantaneous values, and the cumulative amount is to be obtained through the TCP/IP protocol. Packing is sent to the upper Unix system, which realizes cross-platform communication and cross-platform data exchange. 
