AAI143-S00AAI143-S00

PLC對數(shù)字量信號的識別是通過其數(shù)字量輸入模塊完成的。PLC控制軋鋼生產(chǎn)設(shè)備時，設(shè)備中的壓力、溫度、液位、行程數(shù)字及操作按鈕等數(shù)字量傳感器與PLC的輸入端子相連，每個輸入端子在PLC的數(shù)據(jù)區(qū)中分配有一個“位”，每個“位”在內(nèi)存中為一個地址。讀取PLC輸入位的狀態(tài)值可作為識別數(shù)字量故障信號的根據(jù)。診斷數(shù)字量故障的過程，實質(zhì)就是將PLC正常的輸入位狀態(tài)值與相應(yīng)的輸入位的實際狀態(tài)值相比較的過程。如果二者比較的結(jié)果是*的，則表明設(shè)備處于正常工況，不*則表明對應(yīng)輸入位的設(shè)備部位處于故障工況。這就是PLC診斷基于數(shù)字量信號故障的基本原理。這種診斷方法，故障定位準確，可進行實時在線診斷。通過PLC的圖形功能塊編程，還可將故障診斷融入過程控制，達到保護軋鋼設(shè)備的目的。

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鄭娟萍

廈門仲鑫航自動化設(shè)備有限公司 

 PLC對模擬量信號的識別是通過PLC的模擬量輸入輸出模塊來完成的。模擬量輸入輸出模塊采用A/D轉(zhuǎn)換原理，輸入端接收來自傳感器或變送器的模擬信號，輸出端輸出的模擬信號作用于PLC的控制對象。PLC診斷模擬量故障的過程，實質(zhì)就是將在相應(yīng)A/D通道讀到的監(jiān)測信號的模擬量的實際值與系統(tǒng)允許的極限值相比較的過程。如果比較的結(jié)果是實際值遠離極限值，則表明軋鋼生產(chǎn)設(shè)備對應(yīng)的受監(jiān)控部位處于正常狀態(tài)，如果實際值接近或達到極限值，則為不正常狀態(tài)。判斷故障發(fā)生與否的極限值根據(jù)實際系統(tǒng)相應(yīng)的參數(shù)變化范圍確定，利用PLC上的模擬量設(shè)定開關(guān)可精確設(shè)置該極限值。

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