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PLC的日常維護和保養(yǎng)比較簡單，主要是更換保險絲和鋰電池,
基本沒有其它易損元器件。由于存放用戶程序的隨機存儲器（RAM）
、計數(shù)器和具有保持功能的輔助繼電器等均用鋰電池保護，鋰電池
的壽命大約為5年，當鋰電池的電壓逐漸降低到一定程度時，PLC基
本單元上電池電壓跌落到指示燈亮，提示用戶注意有鋰電池所支持
的程序還可保留一周左右，必須更換電池，這是日常維護的主要內(nèi)
容。
調(diào)換鋰電池的步驟為：
■在拆裝前，應(yīng)先讓PLC通電15秒以上（這樣可使作為存儲器備
用電源的電容器充電，在鋰電池斷開后，該電容可對PLC做短暫供電
，以保護RAM 中的信息不丟失）；
■斷開PLC的交流電源；
■打開基本單元的電池蓋板；
■取下舊電池，裝上新電池；
■蓋上電池蓋板。
注意更換電池時間要盡量短，一般不允許超過3分鐘。如果時間
過長，RAM中的程序?qū)⑾А?/div>
此外,應(yīng)注意更換保險絲時要采用指定型號的產(chǎn)品。
I/O模塊的更換
若需替換一個模塊，用戶應(yīng)確認被安裝的模塊是同類型。有些
I/O系統(tǒng)允許帶電更換模塊，而有些則需切斷電源。若替換后可解決
問題，但在一相對較短時間后又發(fā)生故障，那么用戶應(yīng)檢查能產(chǎn)生
電壓的感性負載，也許需要從外部抑制其電流尖峰。如果保險絲在
更換后易被燒斷，則有可能是模塊的輸出電流超限，或輸出設(shè)備被
短路。
PLC的故障診斷是一個十分重要的問題，是保證PLC控制系統(tǒng)正
常、可靠運行的關(guān)鍵。本文對常用的故障診斷方法進行了探討。在
實際工作過程中，應(yīng)充分考慮到對PLC的各種不利因素，定期進行檢
查和日常維護，以保證PLC控制系統(tǒng)安全、可靠地運行。
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