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有源输出和无源输出的区别

Release time: 2021-06-04 Views: 1090 Share

有源信号、无源信号是仪表行业经常接触到的信号类型，有源输出是指输出信号是有源的，无源输出是指输出信号是无源的，下面介绍一下这些信号类型的定义。

有源信号和无源信号(模拟量)

一般对于电流信号，若设备输出的信号(如4-20mA)有电源驱动，则该信号为有源信号；若设备输出的信号无电源，需要DCS/PLC提供电源，则它提供的是无源信号。

当所选用仪表为有源输出时，只需将下一级设备输入接口的正端和负端分别与仪表输出接口的正端和负端对应连接，即可完成信号的传输。当所选用仪表为无源输出时，则需要外部电源提供工作电压去驱动4-20mA电流信号的传输，外部电源可以是独立电源，也可以由下一级设备的配电功能提供。二者的接线方式和匹配的下级设备有所不同，客户在使用时要多加关注。