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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。
njshenxian
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1樓  發(fā)表于: 2017-11-28 19:37
面試官扯淡！輸入點(diǎn)是用光耦隔離轉換的，基本上任何一個(gè)同一電壓等級的傳感器都不會(huì )燒掉輸入口。你就是把24V直接接上去也沒(méi)事的，君不見(jiàn)很多運行反饋都是接在繼電器的常開(kāi)觸點(diǎn)的一端與另一端的24V接起來(lái)？！只有輸出點(diǎn)才考慮電流的，晶體管輸出的帶負荷能力小于繼電器輸出的帶負載能力。

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