1747-R21F 1747-R21F 1747-R21F
模拟量模块有很多种接法。
以你的为例,是电流信号。简单点判断,你的模拟量信号来源(仪表)是4线制还是2线制。
比如一个液位计,需要单独供电的(就是液位计端子上有电源端子),那么液位计的模拟量输出为有源的,该液位计是4线制接法。液位计的模拟量输出(+)接1769-IF4的I in0 +端子,(-)接1769-IF4的V/I in0 -端子,见左图;
如果这个液位计,不需要单独供电(液位计接线端子上没有电源端子),那么需要将24V DC电源串到回路中,24V DC+接仪表的(+)端子,仪表的(-)端子接1769-IF4的I in0 +端子,V/I in0 -端子与ANLG Com端子短接。
1769-IF4必须单独供电,模块的+24DC和dc NEUT端子接24V DC电源
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