當(dāng)內(nèi)部自測試程序啟動(dòng)完成后SCM點(diǎn)亮OKLED,只要模板功能正常該OKLED燈一直點(diǎn)亮，如果當(dāng)電源接通至系統(tǒng)時(shí)該OKLED熄滅，關(guān)斷PLC電源并確認(rèn)該模板正確地安裝在基板上，再打開電源，如果OK LED仍然處于OFF狀態(tài)，表明SCM很可能有硬件故障，應(yīng)該返還處理，模板上的另外兩個(gè)LEDs沒有用到。

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