Fanuc 9900 Parameter List -

Fanuc intentionally hides 9900-series parameters because:

On many Fanuc controls, you cannot see parameter 9900 unless you enable "Parameter Write Enable" (PWE = 1) and sometimes enter a special mode or key code.

In many FANUC systems, spindle parameters overlap with the 9900 series, specifically regarding magnetic sensor orientation.

Here’s a blog post drafted for a CNC technical audience, focusing on the significance and management of high-range Fanuc parameters like the 9900 series. 

Navigating the Fanuc 9000 Series: Understanding Parameter 9900 and Beyond 

In the world of Fanuc CNC controls, parameters are the "DNA" of your machine. While many operators are familiar with common adjustments for spindle speeds (Parameters 3741–3743) or rapid traverse rates (Parameter 1420), things get a bit more mysterious when you cross into the 9000 series. 

Whether you are troubleshooting a legacy system or optimizing a new setup, understanding how to handle these high-level parameters is critical for machine performance and safety.  What is the Fanuc 9900 Parameter? 

In many Fanuc control versions (such as the 16i, 18i, and 21i series), the 9900 series parameters often relate to system options and advanced path control features. 

Specifically, Parameter 9900 is frequently used as a "data table" or "option setting" parameter. Because these settings can fundamentally change how the CNC interprets code or handles multi-axis movement, they are often locked or hidden behind specific access levels.  Common High-Range Parameters to Know: 

9900+: Often designated for software options and system-level configurations.

1241 / 1242: Coordinate values for second and third reference points. 1420: Rapid traverse rate for each axis. 4077: Spindle orientation position adjustment.  How to Access and Edit Parameters safely 

You cannot simply type in a new value for a 9900-series parameter without preparation. Modifying these without a backup can lead to a "dead" machine. 

Enable Parameter Write (PWE):Navigate to the SETTING screen and change "PARAMETER WRITE" from 0 to 1. Expect an alarm to trigger—this is normal and indicates the machine is in edit mode.

Backup Everything: Before changing any 9000-series data, perform a full SRAM backup or output your current parameter list to a memory card/laptop.

Use the MDI Mode: Most parameter changes must be performed while the machine is in Manual Data Input (MDI) mode. fanuc 9900 parameter list

Power Cycle: Changes to system-level parameters like 9900 often require a full "NC Power Off" to take effect.  Why 9900 Matters for Maintenance 

If you are replacing a Fanuc control board or reloading software, the 9900 series is part of the "Option Parameters." These tell the hardware which software features (like High-Speed Machining or 5-Axis Simultaneous Contouring) are active. Without the correct 9900-series data, your machine might "forget" it has certain capabilities.  Technical Resources & Support 

Because 9000-series parameters are often proprietary to the machine tool builder (MTB), your first stop for a specific list should be your machine's original electrical manual. 

For general Fanuc programming and troubleshooting, you can find expert communities and guides on platforms like the Industrial Forum at eMastercam or technical deep-dives on CNC Concepts. 

Need to verify a specific bit in your 9900 list? Drop a comment below with your control model (e.g., 0i-MD or 18i-TB) and the specific behavior you're trying to adjust! 

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

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

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 Fanuc intentionally hides 9900-series parameters because:

(e.g., 16i, 18i, 21i, 0i-M/T). These are often referred to as "Option Parameters" or "Option Bits." ⚠️ Crucial Safety Warning

Modifying 9000-series parameters without a valid option authorization code from Fanuc can lock your controller or cause severe machine malfunction. Always backup your current parameters ( backup) before attempting changes. 1. Function and Purpose

Parameters 9900 and above do not usually control mechanical movements (like feedrate or acceleration). Instead, they act as "switches" that enable or disable software capabilities. Bit-based configuration: Each parameter consists of 8 bits (e.g., #7 6 5 4 3 2 1 0# ). Setting a bit to enables a feature, while disables it. Key Options Covered:

Memory expansion, tool offset quantity, axis expansion (4th/5th axis), cylindrical interpolation, macro execution, and specialized Canned Cycles. 2. Commonly Referenced 9900+ Parameter Types

Note: Specific bit mapping varies by Fanuc model and version. Parameter Range Description Typical Options Managed System Options Option bits for memory, axes, and software features. Extended Options

Similar to 9900; often manages specific Fanuc 10/11/15 options. 3. How to Access and View Option Parameters Option parameters are viewed in the Diagnostic Screen

rather than the standard Parameter screen, as they are part of the CNC system configuration. Type the parameter number (e.g., ) and press Page down to view consecutive option parameters. 4. How to Enable Parameter Writing (PWE)

To change any parameter, the Parameter Write Enable (PWE) must be set to 1: [OFFSET/SETTING] PARAMETER WRITE=1 (Ignore the alarm P/S 100). page to make changes. After changes, set PARAMETER WRITE=0 Turn the power off and back on. 5. Troubleshooting Lost Options

If a CNC machine loses its options (due to battery failure), the 9900 parameters will be blank. Restore from the "Original Parameter Sheet"

provided by the machine tool builder (e.g., Daewoo, Haas, Doosan). Alternative:

Contact Fanuc with your controller serial number to purchase a new option file (e.g.,

Disclaimer: This report is a summary based on common Fanuc documentation. Always verify with your specific Fanuc Parameter Manual (e.g., B-63530EN) for your machine. fanuc parameter detail 9900 to 9998 | Practical Machinist

Introduction to FANUC 9900 Parameter List

The FANUC 9900 series is a line of CNC (Computer Numerical Control) systems renowned for their reliability, precision, and versatility in controlling machine tools. These systems are widely used in various manufacturing processes, including milling, turning, grinding, and more. One of the critical aspects of configuring and optimizing FANUC 9900 CNC systems is understanding and correctly setting their parameters. Parameters in CNC systems like FANUC 9900 are essential as they define the machine's operational characteristics, limits, and functionalities.

Understanding FANUC 9900 Parameters

Parameters in the FANUC 9900 system are numerical values that control various aspects of the CNC machine's behavior. These include, but are not limited to:

List of FANUC 9900 Parameters

While a comprehensive list of FANUC 9900 parameters can be extensive and varies depending on the specific model and configuration of the CNC system, here is a general overview of some key parameters:

Importance of Correct Parameter Setting

Setting the parameters of a FANUC 9900 CNC system correctly is crucial for several reasons:

Accessing and Modifying Parameters

Accessing and modifying parameters on a FANUC 9900 system typically requires a specific set of procedures:

Conclusion

The FANUC 9900 parameter list is extensive and specific to each CNC machine's configuration and operational requirements. Understanding and correctly setting these parameters is vital for the safe, efficient, and accurate operation of the machine. It is always recommended to consult the machine's manual or contact a FANUC professional for specific guidance on parameter settings to avoid errors and ensure optimal performance.

When is it actually appropriate to use this list?

Suppose an X-axis servo motor fails. The replacement is a newer model. The machine builder’s parameter list says:

Parameter 9900 = 273 (Alpha iS 8/3000 motor)

After installing the new motor (same specs), you verify the ID code. If it changed, you set 9900 to the correct ID from Fanuc’s motor list, then power off/on. The CNC then auto-configures current limits, feedback gain, and encoder resolution based on that ID.

If you skip this, you get Servo Alarm 417 (Digital servo parameter error).

Fanuc does not publish a universal 9900 list because each MTB customizes it. To get the exact list for your machine: On many Fanuc controls, you cannot see parameter