Doesnt the physical location with AB PLC5 also represent the address? Isnt slot 0 is normally an input card or can it be either...I forget now its been so long. I remember grouping inputs first then outputs for "housekeeping" purposes mainly but thought there was another reason for it....guess I need to RTFM again. I also remember them in order input, ouput, input, output and so on...for some reason I have always thought the first slot (0) had to be an input.
I go RTFM now.