1756-L62

1756-L62

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(lái)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(jiàn)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(méi)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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