~~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(hào)，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(hào)；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(hào)。

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(hào)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(shí)，光耦合器T導(dǎo)通，直流輸入信號(hào)被轉(zhuǎn)換成PLC能處理的5V標(biāo)準(zhǔn)信號(hào)電平(簡稱TTL)，同時(shí)LED輸入指示燈亮，表示信號(hào)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(qǐng)求邏輯電路組成，這些電路集成在一個(gè)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(dòng)，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(hào)與PLC內(nèi)部電路之間采用光信號(hào)耦合，所以兩者在電氣上*隔離，使輸入接口具有抗*力。現(xiàn)場的輸入信號(hào)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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FPR3315
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FPR3315101R1032 ICSI16D1 24
FPR3316101R0014
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FPR3316401R0016

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