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木易雨林
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樓主  發(fā)表于: 2020-03-12 13:36
背景:
1、歐姆龍的溫控器E5CN,只用了兩個(gè)輔助輸出點(diǎn)(報警輸出 I/O),給到PLC
2、輔助1 使用報警類(lèi)型2(上限),輔助2 使用報警類(lèi)型4(上下限范圍),作為溫度異常的信號,給到PLC

問(wèn)題來(lái)了:
由于熱電偶的原因,導致溫控器監測溫度一直未達到設定值,加熱棒持續加熱,導致部件發(fā)熱冒煙(實(shí)際溫度遠超上限)!

求教各位大神,有什么方法可以避免溫度誤檢造成過(guò)加熱?

實(shí)際工作中還發(fā)生過(guò)兩個(gè)靠近的熱電偶 交叉裝錯的情況,也導致過(guò)加熱

PS:程序現狀
輔助輸出1 常開(kāi)用法,溫度未到設定值,輸出信號ON,PLC寫(xiě)程序,監控這個(gè)信號,5分鐘內未到設定溫度,則進(jìn)行報警,防止斷線(xiàn)等情況
輔助輸出2 常閉用法,溫度超過(guò)設定上下限范圍,則進(jìn)行報警
[ 此帖被木易雨林在2020-03-12 13:49重新編輯 ]
huch1111
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1樓  發(fā)表于: 2020-03-13 12:26
斷線(xiàn)報警或者監控溫度實(shí)時(shí)變化

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