I'm running leadshine drives and steppers on an acorn. They have run with no issues and I did not have to modify the PLC. Are you using the terminals or the DB25 connector. Going from memory its been a while since I hooked it up I had to use the DB25 connector with my leadshine drives. They are not compatible with the terminals on the board where I thought they should be hooked up. Luckily I figured that out before I hooked them up to the wrong place.

Best place to get help with a centroid product is on their own website forum. They have some very knowledgeable people on there.