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Help!! Control and Automation problems

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Q2. switch level, Gate level, Behavioral level ???? Is't correct?
Q3. How to illustrate?? I still not know
Q4. The function of CPU in PLC are c
ommunication with the memory, perform logic and arithmetic operations, updating the inputs and outputs. Is't correct?? Besides, how to illustrate that?
Q5.
PLC uses a volatile memory with a backup battery. PLC uses a non-volatile memory for frequently used for a particular application and required faster setup.
Correct or wrong?

Thanks a lot.

Edited by qpzm77gg

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