Note: On many newer FANUC models, the 9900 option parameters are hidden behind password-protected engineering screens to prevent accidental alteration. Warning: The Risks of Unauthorized Modification
Parameters like 9927.2 (3-axis simultaneous), 9927.3 (Additional axis), and 9928.1 (Reference return) define motion capabilities.
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: Changing an option parameter can significantly alter machine behavior. If you are unsure, consult resources like the Fanuc 0i Parameter Manual or community forums like Practical Machinist for specific machine configurations.
Modifying system-level parameters can trigger specific initialization alarms. Here is how to address them: Alarm Code / Message Probable Cause Corrective Action PWE bit is still set to 1. Change the PWE value back to 0 on the Setting page. SYS_ALM 900 / 910 MAIN RAM ERROR Incorrect memory allocation value in 9920–9930 range. Reload the original SRAM backup via the Boot screen. P/S 000 PLEASE TURN OFF POWER A system parameter requires a hard reboot to initialize. Cycle the main breaker power switch on the machine. Write Protected / Invalid Input Note: On many newer FANUC models, the 9900
Often dictates base control path configuration and basic interpolation options.
Enables G50/G51 for scaling toolpath dimensions up or down. 4. High-Speed Machining Capabilities This link or copies made by others cannot be deleted
Configures (e.g., 40m, 80m, 160m, up to 640m). 9922.2 Enables Constant Surface Speed Control (G96). 9922.4 Enables Model Data Input for conversational programming. How to Edit Fanuc Parameters
Modifying these parameters improperly can cause system alarms, void your warranty, or lock your control. This guide outlines the structure, common functions, and safety protocols for dealing with the FANUC 9900 parameter list. Understanding FANUC 9900 Series Parameters
To help find the exact data for your specific model, let me know the you are running (e.g., 0i-MC, 16i-T, 31i-B), the specific system alarm number you are trying to clear, or what option/hardware feature you are attempting to configure. Share public link
The control will immediately flash a flashing alarm. This is normal; do not clear it yet. Step 3: Locate and Edit the Parameter Press the SYSTEM hard key. Press the PARAM softkey. Type 9900 and press the No. SRH (Number Search) softkey.