Fieldbus module, also known as connector junction box, is a type of industrial connector that can output multiple current or data signals by diverting and converting a connected power supply or data. With the implementation of the Industry 4.0 strategic policy, the development of communication technology, computer technology, and IT technology has gradually penetrated into the field of industrial control. The most important manifestations are industrial Ethernet technology and industrial fieldbus technology, which have brought strong impetus to automation technology. Fieldbus is an industrial data bus, which is the underlying data communication network in the field of automation. It is a digital, bidirectional transmission, and branch structure communication network used in production sites to connect intelligent field devices and automated measurement and control systems.

For the measurement system of fieldbus, the main feature is the multivariable and high-performance measurement, which enables the measurement instrument to have more functions such as computational power. Due to the use of digital signals, it has high accuracy, high resolution, strong anti-interference and distortion resistance. At the same time, it also has the status information of the instrument equipment and can adjust the processing process. The equipment management system can provide management information, diagnostic information, equipment operation status information, and equipment manufacturing information provided by manufacturers for the equipment itself and its processes.

The fieldbus control system is an important component of the entire system, and the software of the control system includes simulation software, configuration software, equipment software, maintenance software, and monitoring software. Firstly, it is necessary to choose to develop configuration software, control and operate the human-machine interface software MMI, which completes the connection between functional blocks through configuration software. After selecting the parameters of the functional blocks, network configuration is carried out. And the database is organized, dynamically storing a large amount of relevant data and application programs, thus achieving cross access and data sharing of data, with high independence. During the operation of industrial equipment, the parameters continuously change and the amount of data is also large. The real-time requirements for control and operation are very high, so a data system with mutual access and real-time operation is formed.

The bus system computer service module adopts the client/server mode, which is currently a popular network computer mode. The server represents the data source, while the application client represents the data consumer. The principle is that the client obtains the data source from the server and further processes it. But the client runs on a PC or workstation, while the server runs on a small or large computer, using both parties' resources, intelligence, and data to complete tasks.

As for industrial Ethernet, it refers to an industrial communication network that is technically compatible with commercial Ethernet, but meets the needs of industrial sites in product design, reliability, real-time performance, environmental adaptability, and other aspects. It has developed after fieldbus and is also the most recognized and promising industrial communication network. The essence of industrial Ethernet is the transition of Ethernet technology from office automation to industrial automation. Due to the wide range of applications of Ethernet, which has received widespread support and high attention from hardware developers and manufacturers, there are many corresponding hardware products for users to choose from, and the price is relatively low.