I think that's what I am going to do. I have 1756-L62(5562controller). I installed processor(slot0) two enbt in slots one and two. I have 1756-IA 16/A and 1756-OA 16/A but I can't locate in I/O ,select module,digital. Does anyone know if a 1756-IA is the same as the1756-IA 16 /A? I haven't read up on the modules yet. Also how do u setup controller tags for a powerflex 40? I will be controlling two drives but never done this before. I will be using version 18 . Thanks for the suggestions.