~~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(zhuǎn)換開關(guān)、行程開關(guān)、繼電器觸頭等開關(guān)量輸入信號;另一類是由電位器、測速發(fā)電機(jī)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(gòu)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(dāng)輸入端的按鈕SB接通時,光耦合器T導(dǎo)通,直流輸入信號被轉(zhuǎn)換成PLC能處理的5V標(biāo)準(zhǔn)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(xiàn)場的強(qiáng)電干擾進(jìn)入PLC。由于輸入電信號與PLC內(nèi)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?,F(xiàn)場的輸入信號通過光電耦合后轉(zhuǎn)換為5V的TTL送入輸入數(shù)據(jù)寄存器,再經(jīng)數(shù)據(jù)總線傳送給CPU。
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