Use either the BOOT menu for full system backup or the regular operation interface for individual parameter files. BOOT backups use FANUC proprietary file formats; regular backups produce text files viewable on a PC.
Power down the entire machine at the main breaker, wait 10 seconds, and turn it back on.
The login function stores NC parameters, PMC parameters, and pitch error compensation data. Tool offsets, work offsets, and machining programs are not saved through this function, so maintain separate backups.
The machine will likely display an alarm, such as . Do not panic. This is a safety mechanism ensuring you are deliberately changing settings. Make the necessary updates (UPD) in the system screen. fanuc parameter list upd
What are you using (e.g., 0i-MC, 31i-B)?
| Parameter Number(s) | Function / Adjustment | Notes & Common Applications | | :--- | :--- | :--- | | | I/O Channel | Sets the data interface used for data transfer (0: RS232, 4: CF Card, 17: USB). | | 103 | Baud Rate | Sets the communication speed for RS232 transfer (11:9600 bps, 12:19200 bps). | | 1320 / 1321 | Software Limits (+) | Set the machine's maximum travel limits in positive (+) and negative (-) directions. | | 1420 | Rapid Traverse Rate | Defines the G00 rapid speed for each axis. | | 1422 | Maximum Cutting Feedrate | Defines the maximum allowed speed for all cutting movements (G01, G02, G03). | | 1815 | APC / Absolute Position | Often used to set or reset the machine's reference point position. | | 1825 | Position Loop Gain | Adjusts the rigidity and servo response of an axis; must be balanced between axes for accuracy. | | 1851 | Backlash Compensation (G01) | Compensates for mechanical play (backlash) during cutting movements. | | 1852 | Backlash Compensation (G00) | Compensates for mechanical play (backlash) during rapid traverse movements. | | 4077 | Spindle Orientation Stop | Fine-tunes the angular stop position of the spindle for tool changes. | | 6071-6079 | User-defined M-codes | Assigns a custom program number to an unused M-code (e.g., setting M-code 100 to run O9010). |
Always back up your list before making major changes using the Plug in a PCMCIA card or USB drive. . This exports the parameters to your external storage. 5. Finalizing Changes Disable PWE: Return to the screen and set PARAMETER WRITE Reset Alarm: button to clear the P/S 100 alarm. Power Cycle: Use either the BOOT menu for full system
Used for troubleshooting alarms. Procedure for Accessing and Updating Parameters (MDI)
Incorrect parameter changes can lead to mechanical interference. Consult your machine tool builder's manual or Fanuc Support before modifying motor or geometry-related constants. or a list of Ethernet/Communication parameters? AI responses may include mistakes. Learn more Part Counts on Fanuc CNC Machines - FactoryWiz
Defines the linear or rotary axis structure and movement direction. The login function stores NC parameters, PMC parameters,
When adding a rotary table or changing a servo drive, the FANUC Serial Servo Bus (FSSB) must be updated to assign hardware attributes to the logical axes. Conclusion
Fanuc CNC parameters control machine operations like rapid traverse (No. 1420), jog feedrates (No. 1423), and reference positions (No. 1241-1242), typically requiring Parameter Write Enable (PWE) to be activated. Key adjustments also include spindle orientation (No. 4077) and system-level changes to counters or servo settings. For specific parameter definitions and troubleshooting, refer to Fanuc documentation or KFASLLC .
Disclaimer: Improper parameter adjustment can damage machine tools or cause severe injury. Always refer to your machine manufacturer’s specific manual.
This is the most direct method and is ideal for single-value changes, such as adjusting tool change positions or modifying an I/O channel. The step-by-step process is described in . Remember to always have the machine in MDI or Emergency Stop mode before starting the process.