List - Fanuc 9900 Parameter

This report provides an overview of the Fanuc 9900–9999 series parameters , which are primarily used to define the options and software features installed on Fanuc CNC controls

Risk: Incorrectly modifying these bits can cause fatal system errors, requiring a full memory clear and restoration from backups. Sample Parameter Bit List

Preventing Damage: Incorrect settings might cause the machine to exceed its physical limits, leading to component wear or failure. fanuc 9900 parameter list

Think of the 9900 parameters as the "master keys" to the control. While standard parameters determine how the machine moves (speeds, feeds, accelerations), the 9900 parameters determine what the machine is capable of doing.

Contact Fanuc with your controller serial number to purchase a new option file (e.g., This report provides an overview of the Fanuc

Constant Surface Speed Control (G96), Tool Life Management, Macro B, Rigid Tapping Axes & Motion

Safety Checklist: Before Editing the Fanuc 9900 Parameter List

1. Full backup: Use a PCMCIA card or USB stick to “ALL INPUT/OUTPUT” – write all parameters, pitch error comp, macro variables, and PMC to a file.
2. Take photos of every 9900 screen (yes, literally with your phone).
3. Note original values – on paper or spreadsheet.
4. Single change rule: Change only one 9900 parameter per power cycle.
5. Power off/on completely (not just RESET) after each edit.
6. Test basic functions: Jog all axes, spindle start, tool change, emergency stop.

Case 3: Recovering a Lost Option After Main Board Replacement

You replaced a failed Fanuc main board. Now the machine thinks it is a standard 3-axis lathe instead of a 5-axis mill. You must: Full backup: Use a PCMCIA card or USB

: These are "Option" parameters that activate specific features (e.g., additional memory, tool life management, or macro variables). Common Use (Parameter 9900) : This specific parameter typically sets the total number of axes