651CD2S1N卡件
651CD2S1N卡件
-----------------★產(chǎn)品簡介
【品牌系列】 ABB機(jī)器人備件，AB，GE,施耐德140CPU,西門子數(shù)控
【型 號(hào)】 您想要的所有型號(hào)
【產(chǎn)品名稱】 ABB機(jī)器人備件，AB，GE,施耐德。西門子摩爾
【產(chǎn)品類別】 DCS PLC 工業(yè)機(jī)器人備件 伺服驅(qū)動(dòng)器
【庫存狀態(tài)】 現(xiàn)貨
【價(jià) 格】 面議 (含17%增值稅)
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公司聯(lián)絡(luò)人：鄭娟萍(銷售工程師)
信號(hào)采集放大電路如圖1所示。在圖中二極管A1、A7是雙向二極管，對后級(jí)電路起到過壓保護(hù)作用。當(dāng)輸入的信號(hào)在正常范圍內(nèi)，A1、A7不起作用，當(dāng)輸入信號(hào)超出正常范圍（或有脈沖干擾信號(hào)出現(xiàn)）時(shí)，A1、A7導(dǎo)通，防止超出后級(jí)電路端口范圍的信號(hào)進(jìn)入后級(jí)電路，破壞后級(jí)A/D電路。CR1為取樣電阻，將從CT1輸出的電流信號(hào)轉(zhuǎn)變?yōu)殡妷盒盘?hào)。LM324和CR4，CR7，CR10，CR13組成同相放大電路將電壓信號(hào)放大后輸入A/D轉(zhuǎn)換電路。
圖1中LM324采用雙電源供電，這樣可以保證LM324輸出電壓達(dá)到5V充分利用A/D轉(zhuǎn)換提高顯示精度。圖1中通過運(yùn)放將輸入信號(hào)進(jìn)行分檔處理，小信號(hào)從P1.0輸出大信號(hào)從P1.1輸出。這樣處理是因?yàn)椋弘妱?dòng)機(jī)保護(hù)器要處理的電流范圍很寬（要從電動(dòng)機(jī)1倍額定電流到10倍額定電流），分檔處理可以提高測量精度。
1.2 I/O單元
開關(guān)量輸入處理電路如圖2所示。電路開關(guān)量由IN1～I(xiàn)N7輸入，通過光藕后產(chǎn)生IS1～I(xiàn)S7，并行信號(hào)IS1～I(xiàn)S7輸入到74HC165，通過74HC165將并行信號(hào)轉(zhuǎn)換為串行信號(hào)傳送給CPU。電阻R11～R18起到限流作用保護(hù)光耦中的二極管不被損壞。RS1～RS8是上拉電阻與電容CS～CS8配合使用既可以穩(wěn)定光耦輸出電平又可以在上電時(shí)對光耦起到保護(hù)作用。
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