PR6423/01B-140 +CON021 EPRO 渦流傳感器

PR6423/01B-140 +CON021 EPRO 渦流傳感器  

現(xiàn)場控制或檢測元件輸入給PLC各種控制信號，如限位開關、操作按鈕、選擇開關以及其他一些傳感器輸出的開關量或模擬量等，通過輸入接口電路將這些信號轉換成CPU能夠接收和處理的信號。輸出接口電路將CPU送出的弱電控制信號轉換成現(xiàn)場需要的強電信號輸出，以驅動電磁閥、接觸器等被控設備的執(zhí)行元件。輸入接口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(fā)電機和各種變換器提供的連續(xù)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(jīng)光耦合器T與內(nèi)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

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