F3XD64-3N
F3XD64-3N
F3XD64-3N
4．2 源型灌电流输入电路
源型输入电路如图1所示，此时，电流的流向正好和漏型的电路相反。电流从直流电源正极流入DI模块的输入端，并由公共端流入直流电源的负极。
4．3 切换型输入电路
为了适应各地区的使用惯，有些厂家PLC DI模块的内部公共端子是采用S/S端子，此端子可以与电源的24V+（正极）或24V-（负极）相连，结合外部仪表接线的变化，使DI模块的输入电路既可以是漏型输入电路，也可以是源型输入电路。较采用公共端（COM端或M端）的DI模块更灵活。S/S端子的发展是为了适用日系与欧系PLC混合使用的工控场合，起到通用的作用，S/S端子也称之 SINK/SRCE可切换型。其电路形式如图4所示。作为源输入时，公共端接电源的负极；作为漏输入时，公共端接电源的正极。这样，可以根据现场的需要来接线，给接线工作带来极大的灵活。 通过选择可以将基本单元的所有输入设置为漏型输入或是源型输入，但不能混合使用。
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