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What is the difference between PLC control system and traditional relay control system?

At present, PLC control system is widely used in industrial production automation control. Compared with the traditional relay control system, it has the following advantages: 1, fast response, low noise and low energy consumption. Small size. 2, powerful function, convenient programming, and the program can be modified at any time; 3, the control precision is high, and complex program control can be carried out. 4. The control process can be automatically detected. 5. The system is stable, safe and reliable.