變頻器中也存在一些數(shù)值型指令信號(hào)（如頻率、電壓等）的輸入，可分為數(shù)字輸入和模擬輸入兩種。數(shù)字輸入多采用變頻器面板上的鍵盤操作和串行接口來給定；模擬輸入則通過接線端子由外部給定，通常通過0～10V/5V的電壓信號(hào)或0/4～20mA的電流信號(hào)輸入。接口電路因輸入信號(hào)而異，所以必須根據(jù)變頻器的輸入阻抗選擇PLC的輸出模塊。
當(dāng)變頻器和PLC的電壓信號(hào)范圍不同時(shí)，如變頻器的輸入信號(hào)范圍為0～10V而PLC的輸出電壓信號(hào)范圍為0～5V時(shí)，或PLC一側(cè)的輸出信號(hào)電壓范圍為0～10V而變頻器的輸入電壓信號(hào)范圍為0～5V時(shí)，由于變頻器和晶體管的允許電壓、電流等因素的限制，需以串聯(lián)的方式接入限流電阻及分壓電路，以保證進(jìn)行開閉時(shí)不超過PLC和變頻器接口電路相應(yīng)的容量。此外，在連線時(shí)還應(yīng)注意將布線分開，保證主電路一側(cè)的噪聲不傳到控制電路中。
——————廈門泰尼電氣有限公司———————————
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*我們僅采用快遞方式遞送備件。（順豐）
*如果您發(fā)現(xiàn)其他供貨商為相同產(chǎn)品提供更為低廉的價(jià)格，我們也愿意參照其價(jià)格向您提供進(jìn)一步的折扣。
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————————廈門泰尼電氣有限公司———————————————
：小劉
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公司地址：廈門海滄街道濱湖一里7號(hào)2008室
IC697CPX935
IC697CPX935
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