What are the functions of each component of the PLC system?

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What are the functions of each component of the PLC system?


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Answer

The basic unit (ie, the main unit) is the core of the PLC control; the expansion unit is a device that expands the number of I/O points, and has a power supply inside; the expansion module is used to increase the number of I/O points and the ratio of changing the number of I/O points, and there is no power inside.Powered by the base unit or expansion unit, the expansion unit and the expansion module have no CPU.


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