PLC是整個係統的神經中樞，所有控制，保護，工作狀態指示都通過PLC內部的虛擬繼電器通過軟連線配合外部給定開關量和信號來完成。控制電壓在電壓以下，可以提高工作的性，遠離高壓室進行操作，可以避免工作人員的誤操作，一站式控制，可以提高工作效率，減少工作人員的勞動強度。用兩條現場總線就可以實現整個係統的信號傳輸，通過PLC的工作狀態和報警指示，便於工作和維修人員的故障排除。另外，與繼電器相比，PLC的免維護性高，工作壽命長。
【瑞士ABB.. 機器人 DSQC係列,ABB Advant OCS,ABB Procontic PLC CPU】
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