~~IC693ACC338！GE！140CPU43412A￥

~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥~~IC693ACC338！GE！140CPU43412A￥￥

輸入接口用于接收和采集兩種類型的輸入信號，一類是由按鈕、轉換開關、行程開關、繼電器觸頭等開關量輸入信號；另一類是由電位器、測速發電機和各種變換器提供的連續變化的模擬量輸入信號。

以圖2所示的直流輸入接口電路為例，R1是限流與分壓電阻，R2與C構成濾波電路，濾波后的輸入信號經光耦合器T與內部電路耦合。當輸入端的按鈕SB接通時，光耦合器T導通，直流輸入信號被轉換成PLC能處理的5V標準信號電平(簡稱TTL)，同時LED輸入指示燈亮，表示信號接通。微電腦輸入接口電路一般由寄存器、選通電路和中斷請求邏輯電路組成，這些電路集成在一個芯片上。交流輸入與交直流輸入接口電路與直流輸入接口電路類似。

圖2 直流輸入接口電路

濾波電路用以消除輸入觸頭的抖動，光電耦合電路可防止現場的強電干擾進入PLC。由于輸入電信號與PLC內部電路之間采用光信號耦合，所以兩者在電氣上完全隔離，使輸入接口具有抗干擾能力。現場的輸入信號通過光電耦合后轉換為5V的TTL送入輸入數據寄存器，再經數據總線傳送給CPU。

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