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4a118
級別: 略有小成
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發(fā)帖數量: 31 個(gè)
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樓主  發(fā)表于: 2023-09-21 11:31
各位好，因為有些機臺使用雙手啟動(dòng)保護（防工傷），而有的按鈕又經(jīng)常被個(gè)別員工去強制短接，有沒(méi)有特殊的按鈕（長(cháng)時(shí)間短接時(shí)輸出不執行）

注 ：不想另加PLC 也不想去加復雜的電路，各位有沒(méi)好的方法 謝謝了！~~
小侯
小侯
級別: 工控俠客
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1樓  發(fā)表于: 2023-09-21 13:49
可以考慮上工前作安全點(diǎn)檢
接點(diǎn)上緣及下緣各觸發(fā)OR確認可以開(kāi)關(guān)
當全部接點(diǎn)測試過(guò)後
D0的數值是否正確即可判斷接點(diǎn)正常與否
以此可以用定時(shí)或是時(shí)鐘信號將D0數值歸零停止機臺運行

或是按鈕接點(diǎn)加計時(shí)器，當某接點(diǎn)長(cháng)按過(guò)久則輸出自保並斷掉運轉控制

最重要還是安全教育及發(fā)現異常的處置

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