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kcai_fly
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樓主  發(fā)表于: 2018-02-02 13:55
在學(xué)習資料中有時(shí)會(huì )看到說(shuō)急停開(kāi)關(guān)要用常開(kāi)符號的，但從急停開(kāi)關(guān)結構上來(lái)說(shuō)應該是常閉的��！為什么要用常開(kāi)符號呢？是和PLC種類(lèi)和廠(chǎng)家有關(guān)系嗎？
suiyaowen
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1樓  發(fā)表于: 2018-02-03 18:43
8樓說(shuō)得對。PLC上常開(kāi)，一般電路上常閉。其實(shí)也就是個(gè)習慣而已。沒(méi)有什么必須的規范。

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