Background As early as 1982, the Institute of Process Control, Department of Automation, Tsinghua University, successfully developed the "Hydraulic Model Control Experimental Platform." Over the years, research on this experimental platform has kept pace with the development of production process automation technology, repeatedly improving the model of the controlled object and the control device, and continuously integrating new processes, technologies, and methods, effectively meeting the teaching and research requirements of Tsinghua University and other institutions. The newly constructed "Small-scale Multi-parameter Process Control Experimental Platform," with its advantages of small size, low cost, intuitive design, complete functions, advanced technology, and ease of use, has been widely promoted and highly praised by peers, playing an important role in automation experimental teaching and scientific research. The cooperation between Zijingqiao Software and Tsinghua University has a long history, with early projects during the Ninth Five-Year Plan and the 863 Program laying a solid foundation. Now, the joint construction of an automation process control laboratory by Zijingqiao and Tsinghua University has further elevated their friendship. According to Tsinghua University's plan, after a period of trial use within Tsinghua University, this system will first be promoted in 100 211 universities nationwide to meet the needs of university students for experimental systems. Tsinghua University Small-Scale Multi-Parameter Process Control Experimental Platform Physical Model The process control teaching experimental system is based on a three-capacity water system. The controlled object of the system consists of three water columns connected in series. Three sensors detect the liquid level height, and the pump speed is controlled through A/D conversion to change the flow rate and regulate the liquid level, thus forming a complete process control system. To make reasonable use of the experimental platform's resources and further expand the experimental content, two temperature signals, one flow rate signal, and one pressure signal are also set. System Structure This experimental system adopts a one-server-to-multiple-experiment-platform (>=1) communication method, using RJ45 port. During the experiment, students can choose either a single-machine operation mode with one server to one experimental platform, or a one-server-to-multiple-experiment-platform mode. Then, using the web publishing function of the Zijingqiao software, students can complete the experiment from any networked location, not just limited to the laboratory. The following is the structure of the entire system. Experimental Control Console System Structure System Functions This system mainly tests the following functions: 1. A user-friendly interactive interface, allowing students to easily complete various teaching experiments using this system. 2. Key parameters provide curve analysis, allowing users to query real-time/historical curves. 3. Experimental management permissions are reasonably differentiated to ensure system security. 4. Limited PID, cascade, and feedforward/feedback control are provided, offering high adjustment accuracy. 5. Powerful web publishing capabilities break the traditional model where experiments must be completed in a laboratory. The following describes the system's functionality. The entire system is embedded in the Tsinghua University Department of Automation's experimental system webpage, and its architecture adopts a webpage style. Experimental Control Console System Architecture: The system primarily completes the setup of various experimental projects. The interface is aesthetically pleasing, simple, and conducive to students completing experiments independently. Process Control Experiment Main Interface: Taking a three-tank single-loop control system as an example, let's look at the specific functions. Three-Tank Single-Loop Control: Real-time Display of Experimental Progress: After entering the current experiment, the screen automatically displays the real-time status of the experimental platform, with liquid level and pressure changing in real-time according to the experiment's progress. While the experiment is in progress, students can also view the experimental schematic diagram and experimental help. Students can easily control the start and end of the experiment. Curve Analysis: Parameter trends are an important standard for evaluating the quality of experimental completion. The system displays the changes in data for key parameters using curves, facilitating the drawing of experimental conclusions and providing a basis for experimental completion. Each curve can be zoomed in and out, and the data can be exported to an Excel spreadsheet for further analysis. PID Control: The system provides a PID controller, allowing easy switching between manual and automatic control, and includes adjustment and control of various PID parameters, facilitating precise experiment completion by students. Web Publishing: The system seamlessly integrates with existing laboratory management systems using web publishing functionality. Different logged-in users have different management permissions, and the system can record the start and end times of student experiments, as well as the results. Furthermore, students can freely choose their experimental locations, not being limited to the laboratory, effectively leveraging the advantages of the network. The powerful functions of the Tsinghua Automation Process Control Platform and network information technology are perfectly combined, adding highlights to this small, multi-parameter control platform, making it a true network laboratory. Summary Since its implementation, the entire system has received unanimous praise from Tsinghua faculty and students. The interface is clear and easy to operate, curve viewing is flexible, and data recording is complete and conducive to experimental summarization. Utilizing the powerful web publishing function, students can choose suitable locations to complete experiments, breaking the previous limitation that experiments must be conducted in a laboratory. With the continuous development of Zijinqiao Software, Zijinqiao Company has cooperated with more and more universities, and the application of Zijinqiao Software has penetrated into various industries, pushing the industry application of automation software to a new level.