IC200ALG260 GE

1761-NET-ENI AB
1747-L532 AB
1746-IB16 AB
1747-CP3 AB
3BSE008538R1 ABB
3HAC025338-006 ABB
DI810 ABB
200900-004 ABB
35AE92 ABB

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描述

一般系统中设有“自动”和“手动”两种工作方式,两种方式不会同时执行。将两种方式的输入分组,从而减少实际输入点。如图1所示。PLC通过I1.0识别“手动”和“自动”,从而执行手动程序或自动程序。图中的二极管用来切断寄生电路。若图中没有二极管,转换开关在“自动”,S1、S2、S3闭合,S4断开,这时电流从L+端子流出,经S3、S1、S2形成的寄生回路电流流入I0.1,使I0.1错误的变为ON。各开关串如入二极管后,则切断寄生回路。

 

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