Additional axis control (4th/5th axis), Axis mirroring, Circular interpolation

Suppose an X-axis servo motor fails. The replacement is a newer model. The machine builder’s parameter list says:

For Fanuc controls manufactured after 2006, these parameters are often hidden from the standard parameter screen and are instead stored in . This ensures they remain intact even if the main memory is wiped. They are typically accessed through a specific diagnostic screen rather than the standard system parameter list. Common 9900 Series Parameters