Traditional pressure control systems typically utilize a combination of relays and contactors. The main defects of this traditional method include poor human-machine interaction, large space occupation, lack of functionality, and difficulty in installation and maintenance.
The adoption of the combined PLC and touch-screen control method comprehensively optimizes these defects in the following areas:

1. Significant Enhancement of Human-Machine Interaction and Equipment Intelligence

 Improved HMI Convenience: The combination of PLC and touch screen can more effectively improve the convenience of human-machine interaction. By optimizing the control method, the equipment becomes more intelligent and humanized.

Implementation of Monitoring and Control Functions: The touch screen (for instance, using the Mitsubishi GOT1000 series GT16 touch screen) serves as the system’s monitoring device and monitoring management unit, equipped with monitoring and parameter setting functions.

Interface Design and Operation Simplification: The touch screen interface design is simple and reasonable, making it convenient for users to interact with target information. Operators control the PLC via soft switches on the touch screen. Furthermore, the operation for synthesizing man-made diamond is simpler.

Clear Mode Division: The system is designed with two interfaces, Manual and Automatic, and features two modes: Manual and Automatic. The Automatic mode is further divided into semi-automatic and fully automatic modes.

2. Enhanced Control Precision, Stability, and Safety

 Achievement of Precise Pressure Control: After debugging, the operating system is able to precisely control the pressure of the cubic hinge pressure machine. Comparison between the pressure curve generated during actual prototype debugging and the ideal curve shows that the system can achieve precise control, thereby providing a technical reference for manufacturing high-quality man-made diamond.

Increased System Stability and Safety: The design using PLC and touch screen resolves defects in traditional control systems concerning system stability and safety. The designed prototype boasts advantages such as high safety and good stability.

Comprehensive Protection Measures: The system design mandates multiple protection measures, including short-circuit protection, overcurrent protection, overvoltage protection, undervoltage protection, and overload protection.

Optimization of Complex Synthesis Process: In the fully automatic mode, the system can automatically execute 11 complex steps in sequence: ① No-load advance, ② Pause, ③ Liquid filling, ④ Overpressure , ⑤ Pressure maintaining , ⑥ Overpressure , ⑦ Pressure maintaining , ⑧ Overpressure , ⑨ Pressure maintaining , ⑩ Pressure relief, and ⑪ Fast return. The corresponding solenoid valves perform actions in each step to complete the synthesis process of man-made diamond.
 

3. Simplification of Hardware and Maintenance：

Simplified Electrical Wiring: The new system makes electrical wiring simpler.

Favorable for Installation and Maintenance: Simplified wiring and modular design are favorable for installation and maintenance, resolving the defect in traditional methods of being "difficult to install and maintain".

Core Hardware Composition: The pressure control system is primarily composed of the PLC (such as the Mitsubishi FX2N-64MR), touch screen, analog-to-digital converter, intermediate relay, and solenoid directional valve.