What do you have (e.g., Fanuc 0i-MF, 31i-B)?
Certain 9900-series parameters are locked by FANUC or the Original Equipment Manufacturer (OEM) and require specific access levels. 1. Overview of FANUC 9900 Parameters
Controls whether Profibus, DeviceNet, EtherCAT, or Fanuc I/O Link i is active.
Often dictates base control path configuration and basic interpolation options.
