In Fanuc CNC systems (such as the Series 16i, 18i, 15, and 21), Parameter 9900 marks the beginning of the "Option Parameters" range, extending through 9999. These parameters are critical as they enable or disable specific software features and hardware integrations. Overview of the 9900 Series Parameters
Parameters in the 9900 range are typically bit-type settings (8 bits per parameter, 0–7). Each bit corresponds to a specific licensed function. Parameter Range Function Category Examples of Options 9900–9910 Basic System & Memory Memory addition (320M, 120M), Inch/Metric conversion 9920–9930 Control & Compensation Spindle orientation, G54-G59 work offsets, Rigid Tapping 9931–9940 Axis & Spindle Options
3rd/4th axis control, Polygon turning, Spindle output switching 9941–9960 Advanced Features Custom Macro B, Mirror Image, High-speed skip function Key Functional Bits for 9900
Based on typical Fanuc configurations, the bits for parameter 9900 often control foundational G-code and hardware behaviors: Bit 0: Canned Cycles Bit 1: G10 Program Input of Offset Bit 2: Mechanical Handle Feed Bit 3: Manual One Pulse Generator Control Bit 5: Inch / Metric Conversion Bit 6: Special G-Code Security and Access
Fanuc considers the 9900 range to be proprietary information. Accessing or modifying these often requires specific conditions: fanuc parameter detail 9900 to 9998 | Practical Machinist
The Fanuc 9900 parameter series (specifically 9900 to 9999) represents the core option parameters for modern Fanuc CNC systems, including the 16i, 18i, 21i, and 0i series. Unlike standard machine parameters that control speeds or feeds, the 9900 series acts as a digital "unlock key" for factory-installed software features. Understanding the 9900 Parameter Series
For Fanuc controls manufactured after 2006, these parameters are often hidden from the standard parameter screen and are instead stored in Flash ROM (FROM). This ensures they remain intact even if the main memory is wiped. They are typically accessed through a specific diagnostic screen rather than the standard system parameter list. Common 9900 Series Parameters
These parameters are bit-level settings where each "bit" (a 1 or 0) enables a specific software option. Parameter No. Typical Function / Feature 9900 Often sets the total number of axes enabled on the machine. 9920.0
Enables Fixed Cycles (Canned Cycles) for milling or turning. 9920.1 Allows G10 Tool Offset input via the program. 9920.2 Enables Manual Pulse Generator (MPG) feed. 9921.0-4 fanuc 9900 parameter list
Configures Program Storage Size (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
Editing any system parameter, especially option parameters, requires enabling Parameter Write Enable (PWE).
Switch to MDI Mode: The machine must be in Manual Data Input (MDI) mode or an emergency stop state.
Access the Setting Screen: Press the SETTING function key on the MDI panel.
Enable PWE: Find the "PARAMETER WRITE" field and change the value from 0 to 1.
Confirm Alarm: The machine will trigger a "P/S 100" alarm (Parameter Write Enable is on). This is normal and indicates you can now make changes.
Enter Parameters: Navigate to the SYSTEM screen to find the specific 9900-series parameters. Critical Warnings and Best Practices
Legal & Warranty Implications: Modifying 9900-series parameters is technically enabling paid software options. Legally, these must be purchased from Fanuc or the machine tool builder. Unlocking options without a license can void warranties or service agreements. In Fanuc CNC systems (such as the Series
Backup Everything: Before changing a single bit, perform a full backup of all parameters (NC, PMC, and Diagnostics) to a PCMCIA card or USB drive.
Expert Guidance: 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.
The Fanuc 9900 series parameters are specifically categorized as Option Parameters for controllers like the Series 16i, 18i, and 21i. These parameters determine which software features and hardware capabilities are enabled on your machine. Key Insights on 9900 Parameters
Purpose: They unlock specific CNC functions such as additional memory, high-speed machining, tool life management, and multi-axis control.
Visibility: On older "i" series controls, they appear on the standard parameter screen. On controls manufactured after mid-2006, they are often stored on a FROM card and may only be viewable through diagnostic screens.
Access: Because these represent paid options, they are typically protected. Changing them incorrectly can lead to machine malfunction or "unpredictable movement". Common 9900 Series Parameters & Options
While the exact bit definitions vary by specific controller model (e.g., ), they generally cover the following areas: Parameter Range Typical Function Category Examples of Options 9900 Axis Configuration Number of controlled axes. 9901 - 9910 Memory & Language
Tape memory additions (320m/120m), Japanese/German/French display. 9911 - 9925 Machining Cycles Parameter 9906 (Velocity Loop Gain):
Program restart, 3rd/4th reference point return, High-speed cycles. 9930+ Specialized Features
Tool offset selection (G45-G48), Cylindrical interpolation, Mirror imaging. How to View or Edit Parameters
Warning: Only modify parameters if you have the original manufacturer settings. Back up all data before proceeding. How to Enable Parameter Write Enable (PWE) on a Fanuc CNC
These parameters adjust how "stiff" or "responsive" an axis is. They determine the accuracy of cutting contours.
Parameter 9906 (Velocity Loop Gain):
Parameter 9914 (Position Loop Gain - Standard):
Parameter 9915 (Position Loop Gain - Rigid Tap):
DO NOT alter 9900 parameters unless you are a trained service engineer.