Max IO Unit in EPIC PR1 Control

I would like to know haw many Snap Pac IO Unit could be added to an EPIC PR1 without affect the performance of the controller.

Welcome to the forums Maximo!

There is a great answer to your question here:

SNAP only changes things slightly in that you can have a controller running local charts, so that can spread the load more than a RIO.

I guess my question to help answer your question is what does the SNAP system architecture look like?
Are you planing to use groov View?
Whats the end game?