The 0 control has been around for a long time. It has gone through a number of variations. The 0 model A, B, and C used analog or the old digital S-series drives. The C-series began to transition into the original alpha series drives. The D-series is digital only-no analog. All of the i-series controls use a fiber optic communications system to the drives. What it boils down to is this, if you want to upgrade to the 0i-F, you will need all new drives and cables. The ladder logic and parameters will also need to be created from scratch. This is an expensive option for a small machine.