IC693MAR590
IC693MAR590
4-20mA和電工標(biāo)準(zhǔn)有關(guān)，4-20mA信號(hào)制是國際電工委員會(huì)(IEC)過程控制系統(tǒng)用模擬信號(hào)標(biāo)準(zhǔn)。我國從DDZ-Ⅲ型電動(dòng)儀表開始采用這一國際標(biāo)準(zhǔn)信號(hào)制，儀表傳輸信號(hào)采用4-20mA,聯(lián)絡(luò)信號(hào)采用1-5VDC，即采用電流傳輸、電壓接收的信號(hào)系統(tǒng)。因?yàn)樾盘?hào)起點(diǎn)電流為4mA，為變送器提供了靜態(tài)工作電流，同時(shí)儀表電氣零點(diǎn)為4mA，不與機(jī)械零點(diǎn)重合，這種活零點(diǎn)有利于識(shí)別斷電和斷線等故障。
根據(jù)模擬信號(hào)傳感器的性能選型搜索：
1、兩線制電流/電壓輸出傳感器(無供電電源，由負(fù)載提供16—24V配電，輸出4-20mA/0-5V)。
1.1、兩線制無源4-20mA輸入型傳感器，經(jīng)電流隔離配電器配電后與PLC連接。如圖1所示，稱重、測距傳感器正端接16—24VDC,負(fù)端輸出4-20mA電流。
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