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YOKOGAWA AAM10 橫河
直流輸入接口電路中，當輸入開關閉合時，光敏晶體管接收到光信號，并將接受的信號送入內部狀態寄存器。即當現場開關閉合時，對應的輸入映像寄存器為“1”狀態，同時該輸入端的發光二極管(LED)點亮；當現場開關斷開時，對應的輸入映像寄存器為“0”狀態。光電耦合器隔離了輸入電路與PLC內部電路的電氣連接，使外部信號通過光電耦合變成內部電路能接收的標準信號。
圖（b）交流輸入接口電路中，當輸入開關閉合時，經雙向光電耦合器，將該信號送至PLC內部電路，供CPU處理，同時發光二極管（LED）點亮。（2）輸出接口電路
為適應不同負載需要，各類PLC的輸出都有三種類型的接口電路，即繼電器輸出、晶體管輸出、晶閘管輸出。其作用是把PLC內部的標淮信號轉換成現場執行機構所需的開關量信號，驅動負載。發光二極管(LED)用來顯示某一路輸出端子是否有信號輸出
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