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detecting key from external keypad

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In old PLC external keyboard is interfaced by N-output = column and M-input = row.

N x M keypad is worked in dynamic scan mode.

In simplest configuration you must to use one input for one external button (expansion up to  128 input can be connected).

Otherwise you must

3 hours ago, Joe Tauser said:

Post as much information as you can on your external keypad - manufacturer, model, data sheet, schematic



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