PLC有很強(qiáng)的自診斷功能,PLC每掃描一次執(zhí)行一次自診斷檢查,確定PLC自身的動作是否正常,如電源檢測、內(nèi)部硬件是否正常、程序語法是否有錯等。如檢查出異常時,CPU面板的LED及異常繼電器會接通,在特殊寄存器中會存入出錯代碼;CPU能根據(jù)錯誤類型和程度發(fā)出信號,甚至進(jìn)行相應(yīng)的出錯處理,使PLC停止掃描或強(qiáng)制變成STOP狀態(tài)。
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