MVME-133XT
PLC有很強的自診斷功能，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，甚至進行相應的出錯處理，使PLC停止掃描或強制變成STOP狀態(tài)。
MVME-133XT
MVME-133XT
從PLC的工作原理知，PLC的輸入與輸出在物理上是彼此隔開的，其間的是靠運行存儲于它的內(nèi)存中的程序?qū)崿F(xiàn)。它的入出相關，不是靠物理過程，不是用線路；而是靠信息過程，用軟邏輯。它的工作基礎是用好信息。
信息不同于物質(zhì)與能量，有自身的規(guī)律。信息便于處理，便于傳遞，便于存儲；信息還可重用，等等。正是由于信息的這些特點，決定了PLC的基本特點。
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