1771-ID01
在PLC中存放用戶程序的隨機(jī)存儲(chǔ)器(RAM)、計(jì)數(shù)器和具有保持功能的輔助繼電器等均用鋰電池保護(hù),鋰電池的壽命大約5年,當(dāng)鋰電池的電壓逐漸降低達(dá)一定程度時(shí),PLC基本單元上電池電壓降低指示燈亮。提示用戶注意,有鋰電池支持的程序還可保留一周左右,必須更換電池。
更換鋰電池步驟:
1、在更換電池前,首先備份PLC的用戶程序
2、在拆裝前,應(yīng)先讓PLC通電15s以上(這樣可使作為存儲(chǔ)器備用電源的電容器充電,在鋰電池?cái)嚅_(kāi)后,該電容可 對(duì)PLC做短暫供電,以保護(hù)RAM中的信息不丟失);
3、斷開(kāi)PLC的交流電源
4、打開(kāi)基本單元的電池蓋板
5、取下舊電池,裝上新電池
6、蓋上電池蓋板
更換電池時(shí)間要盡量短,一般不允許超過(guò)3min。如果時(shí)間過(guò)長(zhǎng),RAM中的程序?qū)⑾А?/p>
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