The PLC control system is currently widely used in industrial production automation control. Compared with the traditional relay control system, it has the following advantages: l) Fast response speed, low noise, low energy consumption, small size; 2) Powerful functions, convenient programming, The program can be modified at any time; 3) The control accuracy 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.
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