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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。
eledesigner
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1樓  發(fā)表于: 2017-11-29 08:45
面試的是個(gè)250，啥水平，垃圾水平

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