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廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品： AB模塊PLC |
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廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品： AB模塊PLC |
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聯(lián)系方式：張亮查看聯(lián)系方式
更新時(shí)間：2018-03-28 20:49:38瀏覽次數(shù)：251
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IC693MDL742-+-+-IC693MDL742
IC693MDL742-+-+-IC693MDL742
要提高讀入PLC現(xiàn)場(chǎng)信號(hào)的可靠性，還可利用控制系統(tǒng)自身的特點(diǎn)和信號(hào)之間的關(guān)系來判斷信號(hào)的可信程度。如進(jìn)行液位控制時(shí)，由于儲(chǔ)罐的尺寸是已知的，進(jìn)液或出液的閥門開度和壓力也是已知的，在一定時(shí)間里罐內(nèi)液體變化高度大約在什么范圍內(nèi)是知道的，如果這時(shí)液位計(jì)送給PLC的數(shù)據(jù)和估算液位高度相差較大，判斷可能是液位計(jì)故障，通過故障報(bào)警系統(tǒng)通知操作人員檢查該液位計(jì)。又如各儲(chǔ)罐有上、下液位極限保護(hù)，當(dāng)開關(guān)動(dòng)作時(shí)發(fā)出信號(hào)給PLC，并判斷這個(gè)信號(hào)是否真實(shí)可靠。在程序設(shè)計(jì)時(shí)將這信號(hào)和該罐液位計(jì)信號(hào)對(duì)比，如果液位計(jì)讀數(shù)也在極限位置，說明該信號(hào)是真實(shí)的；如果液位計(jì)讀數(shù)不在極限位置，判斷可能是液位極限開關(guān)故障或信號(hào)傳送線路故障，同樣通過報(bào)警系統(tǒng)通知操作人員處理該故障。
：張亮（工程師） 專線：
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