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Read Key ABB

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hi from Turkey. i'm startup programmer. We have ABB AC800M. There are a lot of key (IW1.5.9.2, IW1.5.9.4.). With c# how to read this key. In Abb programın there are showing. IW1.5.9.2 = 1880. I want to read with C#. how to i start.Thanks