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snowmaple
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樓主  發(fā)表于: 2017-11-28 10:03
各位高手，我記得有次面試的時(shí)候，面試官問(wèn)我選傳感器要注意哪些？我之前選傳感器就注意是PNP還是NPN的就可以了，當然電壓都是DC24V。面試官告訴我還要對內部電路很熟，不然電流大了會(huì )燒PLC的輸入口。所以想在這里請教高手們，選傳感器真要注意內部電路和電流嗎？謝謝高手指導。
老兔子
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1樓  發(fā)表于: 2017-11-28 20:00
選傳感器除了注意是PNP還是NPN外，確實(shí)還需要注意電壓和電流是否符合負載的需要，不能一概認為電流不用考慮，對于感性負載來(lái)說(shuō)更是這樣。

但對于PLC的輸入點(diǎn)來(lái)說(shuō)這一點(diǎn)可以忽略。

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