I suppose that would be important information. It's a recent controller... KRC4. The controller is outfitted with an Ethercat interface. I can't remember exactly which modules but I believe about 16 digital IO and at least 2 relay modules. Additional modules would be easy enough to add.
I didn't plan on adjusting any of the weld parameters (feed speed or voltage) available to me during the process. We currently don't adjust these when manually welding. Gas flow is controlled with the MIG gun trigger. I just glanced at second hand robotic welding units via eBay and they actually seem pretty reasonable though I am only seeing the power source so perhaps the additional accessories would add up to something more significant.
I don't have the welding package on the control so I guess I'd have to roll my own or investigate that cost from Kuka.