變頻器中也存在一些數(shù)值型指令信號（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的電壓信號或0/4～20mA的電流信號輸入。接口電路因輸入信號而異，所以必須根據(jù)變頻器的輸入阻抗選擇PLC的輸出模塊。
當變頻器和PLC的電壓信號范圍不同時，如變頻器的輸入信號范圍為0～10V而PLC的輸出電壓信號范圍為0～5V時，或PLC一側(cè)的輸出信號電壓范圍為0～10V而變頻器的輸入電壓信號范圍為0～5V時，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，以保證進行開閉時不超過PLC和變頻器接口電路相應(yīng)的容量。此外，在連線時還應(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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*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格，我們也愿意參照其價格向您提供進一步的折扣。
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————————廈門泰尼電氣有限公司———————————————
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IC697CPX935
IC697CPX935
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