coop31, Machine Type, Control Type would be needed info. Are you running in "Single Block" or "MDI"? The Control Software loaded is on the 'MORE>> ' > 'Service' page if a A2100 Control. Options turned on are on the 'MORE>> ' > 'SYS Configuration' > 'Purchased Options'. A2100 UK-VMC was always a contouring full 4 axis.
See Attached File: A21-16 VMC Rotary Axis.pdf