一般情況下可依照輸入---順序執(zhí)行---輸出的方法進(jìn)行檢查,或用寫入器構(gòu)成的輸入監(jiān)視器檢查。當(dāng)輸入LED不亮?xí)r,1輸入檢查是利用輸入LED指示燈識(shí)別??沙醪酱_定是外部輸入系統(tǒng)故障,再配合萬用表檢查。如果輸出電壓不正常,就可確定是輸入單元故障。當(dāng)LED亮而內(nèi)部監(jiān)視器無顯示時(shí),則可認(rèn)為是輸入單元、CPU單元或擴(kuò)展單元的故障?! ?/div>
則是順序錯(cuò)誤(例如內(nèi)部繼電器雙重使用等),2順序執(zhí)行檢查是通過寫入器上的監(jiān)視器檢查。當(dāng)梯形圖的接點(diǎn)狀態(tài)與結(jié)果不一致時(shí)?;蚴沁\(yùn)算局部出現(xiàn)故障?! ?/div>
則可認(rèn)為是CPU單元、1/0接口單元的故障。當(dāng)輸出LED亮的而無輸出,3輸出檢查可用輸出LED指示燈識(shí)別。當(dāng)運(yùn)算結(jié)果正確而輸出LED指示錯(cuò)誤時(shí)。則可判斷是輸出單元故障,或是外部負(fù)載系統(tǒng)呈現(xiàn)了故障。
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2、輸入/輸出單元異常、擴(kuò)展單元異常:
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應(yīng)首先檢查輸入/輸出單元和擴(kuò)展單元連接器的插入狀態(tài)、電纜連接狀態(tài),發(fā)生這類報(bào)警時(shí)。確定故障發(fā)生的某單元之后,再更換單元。
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3、存儲(chǔ)器異常:
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如果是順序存儲(chǔ)器的問題,存儲(chǔ)器異常報(bào)警時(shí)。通過重新編程后還會(huì)再現(xiàn)故障。這種情況可能是噪聲的干擾引起順序的變化,否則應(yīng)更換存儲(chǔ)器?! ?/div>
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4、CPU異常:
臺(tái)灣6DD1842-0AB0饋電模塊
應(yīng)檢查CPU單元連接于內(nèi)部總線上的所有器件。具體方法是依次更換可能發(fā)生故障的單元,CPU異常報(bào)警時(shí)。找出故障單元,并作相應(yīng)處置?! ?/div>
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以上是關(guān)于西門子PLC系統(tǒng)的故障維修,可供大家參考,如果想要了解更多西門子知識(shí),關(guān)注我們。
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