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Cabinet structure composition

1. The sides and front and rear doors of the PLC control cabinet are all made of 2.0mm-thick material. Cold-rolled steel sheet Made with 1.5mm thick material on both sides. Cold-rolled steel sheet Make.

2. The PLC control cabinet features front and rear doors. The front door is designed with a glass window (the glass window is intended to allow observation of the PLC and key equipment’s operational status inside the cabinet, while also ensuring the overall aesthetic appeal of the door; all control cabinet doors should maintain consistency). The rear door is a double-door design.

3. A cover plate, 100 mm above the bottom of the cabinet, shall be installed at the lower part of the cabinet. The cover plate consists of two pieces, front and rear. Each cover plate shall have a cable outlet hole measuring 200 mm × 100 mm on both sides near the cable tray. The cover plates shall be made of 2.0 mm-thick steel plates and reinforced with stiffening ribs.

4. The components inside the control cabinet are arranged in a front-to-back layout, forming a double-sided upright beam structure. The distance between the front and rear upright beams is 100 mm. The clear space from the front upright beam to the front door is 300 mm, and the clear space from the rear upright beam to the rear door is 400 mm.

5. Install an exhaust fan centered on the top of the PLC control cabinet. Install fluorescent lighting tubes at the front and rear of the cabinet top. Install a fluorescent lighting tube at the rear of the instrument cabinet top.

6. The vertical cable trays on both sides inside the cabinet, located close to the cabinet side panels, should be tightly fitted against the side panels to ensure effective clear space within the cabinet.

7. In the PLC cabinet S7-300 The 400 substrate is mounted on an insulating bakelite board, and the substrate is kept insulated from the cabinet body.

8. For the PLC cabinet (with an internal layout diagram), the components and other parts inside the cabinet shall be arranged according to the requirements of the installation drawing.

9. Wiring inside the cabinet shall follow the design shown in the drawings. Terminal blocks that are intended to be short-circuited inside the cabinet must be short-circuited. The specifications for wiring inside the cabinet (multi-strand copper-core flexible wires) must strictly adhere to the wiring regulations.

Cabinet component composition

1. As the control core, the PLC control cabinet plays a crucial role in the entire control system. The scalability of PLC systems, their real-time control performance, and their stability under harsh environmental conditions have all contributed to the widespread adoption of PLC control cabinets across various industries. In essence, a PLC control cabinet is a programmable control system assembled from various low-voltage components. Users can specify the equipment they wish to control and the corresponding control methods according to their specific needs. Engineers from Hebei Junaide Electric will provide you with the most perfect solution.

2. A PLC control cabinet typically consists of a circuit breaker, intermediate relays, a switching power supply, signal isolation barriers, a touch screen, and a PLC itself. One of the key advantages of PLC control cabinet systems is their scalability. PLCs such as the S7-300 adopt a modular structure, allowing the number of I/O points to be expanded according to specific needs. This can be achieved by adding modules to the right side of the CPU or by setting up an ET200M system. Currently, the ET200M approach is widely used. The ET200M system enables the control system to be extended right next to the equipment, thereby eliminating the need for numerous connecting cables. This system is particularly well-suited for applications where the site area is large and equipment is relatively dispersed, such as in water treatment plants.

3. Another advantage of PLC systems lies in their powerful communication capabilities, which support various communication protocols commonly used in the industry today, such as Modbus RTU, Industrial Ethernet, Profibus-DP, MPI, PPI, and more. In large-scale systems, Industrial Ethernet and Profibus-DP are frequently employed for communication, while Modbus RTU is often used for communication with third-party instruments. In industries such as wastewater treatment, metallurgy, food processing, chemical engineering, power generation, and environmental protection, field control cabinets typically communicate with higher-level supervisory systems via Industrial Ethernet—this approach not only ensures high communication speeds but also supports long-distance communication. By using optical-electrical converters, the communication distance can be further extended, and a ring network redundancy system can be established.

4. The prerequisite for a fiber-optic ring network redundancy system is that each control cabinet must be equipped with a CPU and an Ethernet interface, and it must also include an optoelectronic converter that supports ring network redundancy. The advantage of a fiber-optic ring network redundancy system lies in its provision of dual-layer protection for the communication network: no matter where the fiber optic cable is broken, the functionality of the entire system will not be affected. Each control site can communicate with every other site while remaining independently operational.

With the widespread adoption of GPRS technology, third-party GPRS devices for PLC systems are becoming increasingly common, and their usage is growing ever simpler. Adding GPRS functionality to a PLC control cabinet system is like giving the PLC a pair of wings—allowing it to be placed anywhere where conditions permit. Moreover, remote debugging and monitoring eliminate the need for engineers to travel back and forth, saving time and effort.

5. The PLC control cabinet features a simple and clear internal layout, with components that are highly standardized and do not involve the complex wiring structures found in traditional control cabinets. Moreover, it uses safe 24V DC power to control AC equipment, making wiring, commissioning, and maintenance exceptionally convenient. To modify the equipment’s control logic, there is no need to rewire the hardware—simply updating the software program suffices. With just one computer and one professional engineer, we can solve all your problems, saving you significant amounts of manpower, financial resources, and material costs.

Quality Assurance System

We have consistently taken standardization and metrology as our foundation, striving for impeccable product quality. Quality is the cornerstone of our company. Hebei Junaide has established a Quality Management Center and built a comprehensive quality assurance system comprising three major modules—pre-production planning, process control, and quality verification—as well as three supporting systems: equipment maintenance, personnel training, and data information management. As a result, we have successfully obtained GB/T19001-2000 national quality system certification.

Equipment maintenance: Develop and implement maintenance, calibration, and servicing plans for production and testing equipment, ensuring that production machinery and testing instruments operate without faults and meet precision requirements.

Personnel Training: Through quality training at different levels, employees will develop a strong quality mindset and master effective quality control methods.

Prenatal planning: Includes product process and structural analysis, process flow diagrams, identification of critical processes and key process parameters, and development of a quality plan.

Process Control: This includes quality verification during the production process, real-time statistical analysis, process control, and timely corrective actions to ensure that the production process remains under control.

Quality Verification: Establish a comprehensive set of quality standards and inspection and testing procedures covering the entire process—from raw materials to finished products. Each stage is staffed with professional quality inspectors responsible for ensuring clear labeling and accurate quality records, thereby preventing nonconforming products from entering the next production stage or leaving the factory.

Data Information Management: Establish a mechanism for managing process control and product inspection data, accumulate and analyze this data, and provide information support for quality management.