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【Electrical Version】Daily Question 20171221

2017-12-21View Original

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Regarding PLCs, which of the following statements is correct? ( ) A. Both PLCs and frequency converters can perform self-diagnosis of faults. B. The input circuit of the PLC uses optocoupling. C. The DC digital output module of the PLC is also known as the transistor digital output module, and it belongs to the category of contactless output modules. D. All of the above are correct. Correct answer: D

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