故障處理某些故障或狀態(tài)對系統(tǒng)的操作和執(zhí)行產(chǎn)生影響時.說明在90-30 PLC系列、90-20 PLC系列和Micro PLC中存在故障。這些情況可能影響PLC控制機器或過程的能力。其它情況可能只作為一種警告，如:低的電池信號保護存儲器的電池電壓偏低,應更換,此情況或錯誤稱為故障。

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