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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？
wu32u2
耐得住挫折的打磨，我們將迸發(fā)出比鉆石還璀璨的光芒——
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1樓  發(fā)表于: 2018-05-30 11:25
急停不管在什么情況下都得常閉，不管是不是連PLC，有人可能不服，我就說(shuō)一個(gè)例子，當急停連常開(kāi)時(shí)，電線(xiàn)接點(diǎn)松動(dòng)或電線(xiàn)斷路再或者急停按鈕失效的時(shí)候，你無(wú)法知曉，此時(shí)急停就失效了；相反，急停連常閉時(shí)，一旦急停接點(diǎn)松動(dòng)或電線(xiàn)斷開(kāi)，安全繼電器或PLC立即知曉。
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