PLC (Programmable Logic Controller) automated control systems are control systems that enable production processes or other processes to proceed according to desired patterns or predetermined procedures without direct human intervention. Automatic control systems are the primary means of achieving automation, and are often simply referred to as automatic control systems.
PLC automation control systems can be categorized into open-loop and closed-loop control systems based on their control principles. Based on the given signal, automatic control systems can be classified into constant-value control systems, servo control systems, and program control systems. All control systems aim to achieve the technological requirements of the controlled object, thereby improving production efficiency and product quality. Therefore, Nanning Dachao Electric summarizes the following basic principles to be followed when designing PLC automation control systems:
1. To meet the control requirements of the controlled object to the greatest extent possible.
Fully utilizing the functions of the PLC to maximize the control requirements of the controlled object is the primary prerequisite for designing a PLC-based automated control system, and it is also the most important principle in the design process. This requires designers to conduct in-depth on-site investigations and research before designing, collecting data from the control site and relevant advanced domestic and international materials. Simultaneously, close cooperation with on-site engineering management personnel, engineering technicians, and on-site operators is essential to formulate control schemes and jointly solve key and challenging issues in the design.
2. Ensure the safety and reliability of the PLC automation control system.
Ensuring the long-term safe, reliable, and stable operation of a PLC automation control system is a crucial principle in control system design. This requires designers to comprehensively consider system design, component selection, and software programming to guarantee the safety and reliability of the control system. For example, the PLC program should be able to operate normally not only under normal conditions but also under abnormal conditions (such as sudden power outages and restorations, incorrect button presses, etc.).
3. Strive for simplicity, economy, and ease of use and maintenance.
While a new control system can improve product quality and quantity, bringing significant economic and social benefits, the investment in the new system, technical training, and equipment maintenance will also increase operating costs. Therefore, while meeting control requirements, it is crucial to continuously expand the benefits of the system while simultaneously reducing its costs. This necessitates that designers not only ensure the control system is simple and economical but also convenient and cost-effective in its use and maintenance, avoiding the blind pursuit of automation and high performance targets.
4. Adapting to the needs of development
As technology continues to advance, the requirements for control systems will also continue to increase. Therefore, the design should appropriately consider the future development and improvement needs of the control system. This requires that when selecting PLCs, input/output modules, the number of I/O points, and memory capacity, appropriate margins should be reserved to meet future production development and process improvements.
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