You attempted to write a value to the 9900 block that violates the software safety limitations.
Boot the CNC into the boot-menu screen (hold the two rightmost softkeys below the screen while powering on) and restore the original SRAM backup file. Summary Best Practices for CNC Machinists
Activation of specific Ethernet paths, Fast Ethernet, data server functions, and fieldbus protocols (Profibus, CC-Link, DeviceNet).
Ensure you carefully verify which exact bit you are modifying based on your machine tool builder's documentation. Step 4: Finalizing and Cycle Power Once edited, return to the screen. Change PWE back to 0 . Press the RESET button to clear temporary alarms. fanuc 9900 parameter list
Never attempt to modify a FANUC 9900 series parameter without a verified data sheet from the original Machine Tool Builder (MTB) like Fanuc, Doosan, Mori Seiki, or Kitamura. Keep a fresh duplicate backup of your SRAM data on an external PCMCIA card or USB drive tucked inside the electrical cabinet. Having this physical insurance policy ensures that a corrupted 9900 parameter list can be remedied in minutes rather than resulting in days of lost manufacturing productivity.
Use the arrow keys to highlight the specific bit or value you need to modify. Input the new value and press the softkey. Step 4: Cycle Power
In many FANUC systems, spindle parameters overlap with the 9900 series, specifically regarding magnetic sensor orientation. You attempted to write a value to the
Navigating the Fanuc 9000 Series: Understanding Parameter 9900 and Beyond
: Ensure the machine is in MDI mode or Emergency Stop .
The following are common 9900 parameters found in FANUC 16i/18i/21i/0i series controls: Ensure you carefully verify which exact bit you
When parameters are corrupted, incorrect, or improperly configured, the system throws specific Program/System (P/S) or Servo Alarms. Use this matrix to guide your diagnosis: Alarm P/S 000 (Turn Off Power)
The 9900 series parameters, particularly within the 9927–9933 range, control critical machine functionalities such as axis management, compensation, and advanced features.
After changing these, the servo amplifier for axis 4 must be physically present and parameter 202x (servo number) correctly set. Failure to match hardware results in “SERVO ALARM: AXIS 4 NOT READY”.
It is crucial to understand that many of the parameters discussed, especially those controlling program editing for 8000-8999 and 9000-9999, are protected by a password system. This is an additional layer of security beyond standard PWE.