1794-OB16

PLC進行模擬量控制，要配置有模擬量與數字量相互轉換的A／D、D／A單元。它也是I/O單元，不過是特殊的I/O單元。

    A/D單元是把外電路的模擬量，轉換成數字量，然后送入PLC。D/A單元，是把PLC的數字量轉換成模擬量，再送給外電路。

    作為一種特殊的I/O單元，它仍具有I/O電路抗干擾、內外電路隔離，與輸入輸出繼電器（或內部繼電器，它也是PLC工作內存的一個區。可讀寫）交換信息等等特點。

    這里的A/D中的A，多為電流，或電壓，也有為溫度。D/A中的A，多為電壓，或電流。電壓、電流變化范圍多為0～5V，0～10V，4～20mA。有的還可處理正負值的。備貨，備貨，降降降，火火火，火火火……
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