mihirdave Posted April 13, 2019 Report Share Posted April 13, 2019 i want to interface external keypad to the v120 t38 so how can write program to detect it? Quote Link to comment Share on other sites More sharing options...
MVP 2021 Ausman Posted April 14, 2019 MVP 2021 Report Share Posted April 14, 2019 How do you want to interface the keypad? Direct inputs? Modbus etc? cheers, Aus Quote Link to comment Share on other sites More sharing options...
MVP 2021 Joe Tauser Posted April 14, 2019 MVP 2021 Report Share Posted April 14, 2019 Post as much information as you can on your external keypad - manufacturer, model, data sheet, schematic, and anything else we'll need to help. Joe T. Quote Link to comment Share on other sites More sharing options...
MVP 2021 kratmel Posted April 14, 2019 MVP 2021 Report Share Posted April 14, 2019 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 Quote Link to comment Share on other sites More sharing options...
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