Do you have a copy of the FANUC Robotics I/O Unit–MODEL A Connection and Maintenance Manual? It has all the info you need.
My manual came with an RJ3iB controller, but I expect it would be the same for the R30iA - here's what it says you need:
A base unit (they come in 5 and 10 slot, horizontal and vertical - ABU05A, ABU10A, ABU05B, and ABU10B0
An interface module (AIF01A, AIF01B, or AIF02C)
An I/O link cable (K1X) going from JD1A on the controller to JD1B on the interface module
Power cable - make your own. My manual calls for an SMS3PN-5 housing with RC16M-SCT3 pins, but both of these have been discontinued by the manufacturer - I was able to find compatible replacements when I did this project last year.
I/O cards - See attached images.
As I said, this is from an RJ3iB manual; but should at lease get you pointed in the right direction until somebody more knowledgeable comes by with a better answer.