140DDI85300C 140DDI85300C 140DDI85300C
模擬量模塊有很多種接法。
以你的為例,是電流信號(hào)。簡(jiǎn)單點(diǎn)判斷,你的模擬量信號(hào)來源(儀表)是4線制還是2線制。
比如一個(gè)液位計(jì),需要單獨(dú)供電的(就是液位計(jì)端子上有電源端子),那么液位計(jì)的模擬量輸出為有源的,該液位計(jì)是4線制接法。液位計(jì)的模擬量輸出(+)接1769-IF4的I in0 +端子,(-)接1769-IF4的V/I in0 -端子,見左圖;
如果這個(gè)液位計(jì),不需要單獨(dú)供電(液位計(jì)接線端子上沒有電源端子),那么需要將24V DC電源串到回路中,24V DC+接儀表的(+)端子,儀表的(-)端子接1769-IF4的I in0 +端子,V/I in0 -端子與ANLG Com端子短接。
1769-IF4必須單獨(dú)供電,模塊的+24DC和dc NEUT端子接24V DC電源
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