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Understanding how these parameters function is critical for maintenance technicians, CNC programmers, and engineers looking to optimize machine performance or troubleshoot system-level faults. What are FANUC 9900 Parameters?
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.
Below is a sanitized example from a working 5-axis machining center:
Always consult your machine tool builder's documentation, original data sheets, or a certified FANUC service representative before altering option parameters.
When a machine tool builder (MTB) purchases a control system from FANUC, the hardware often contains the capability for hundreds of advanced software features. However, only the features purchased by the end-user or selected by the MTB are activated. The 9900 series parameters are used by the system to verify which options are licensed and active on that specific control board. Common Functions Governed by 9900+ Parameters fanuc 9900 parameter list
(often referred to as the option parameters) dictate which software features and options are enabled on the CNC control board.
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
Having a complete, verified backup is the single most important rule when working with 9900-series parameters. If a mistake occurs, the ability to restore the system to its working state depends entirely on the quality of your backups.
user wants a long article about "fanuc 9900 parameter list". I need to provide a comprehensive resource. I'll search for information on FANUC 9900 parameters, likely related to CNC parameter 9900 which is about password/protection. I'll also look for general parameter lists, manuals, and explanations. search results show various discussions. I need to open some of these to get detailed information. search results provide information on the 9900 parameter. I will structure the article with an introduction, what the 9900 parameter is, common values, how to access it, related parameters, important warnings, and a conclusion. I'll cite sources like the IndustryArena thread, the Suicha article, the WDS guide, and the Baidu document. FANUC 9900 parameter is a crucial setting that forms part of a highly protected group of "secret parameters" spanning from 9900 to 9999. These settings are fundamental for configuring a machine's capabilities, such as total axis counts, and are considered a factory "key" that significantly impacts your CNC machine's functionality. Understanding the 9900 parameter list is essential for technicians undertaking expansions like adding a fourth axis or for troubleshooting issues. This article serves as a comprehensive guide to understanding these parameters, their common values, and best practices for working with them. Understanding how these parameters function is critical for
| Parameter | Description (Typical) | |-----------|----------------------| | | Servo motor ID for the 1st axis (X) | | 9901 | Servo motor ID for the 2nd axis (Y/Z) | | 9902 | Servo motor ID for the 3rd axis | | 9903 | Servo motor ID for the 4th axis (optional) | | 9904 | Spindle motor ID (main spindle) | | 9905 | Spindle motor ID (2nd spindle, if present) | | 9906 | High-resolution setting / pulse coder type | | 9907 | Amplifier type code (Alpha/Beta series) | | 9908 | Axis number assignment (mapping physical drives to logical axes) | | 9909 | Acceleration/deceleration time constant for spindle | | 9910 | Servo loop gain setting (related to HRV) |
| Parameter | Associated Function(s) | Brief Description | | :--- | :--- | :--- | | | Axis Configuration & System Options | Often used to define basic axis configuration, such as disabling specific axes, setting the number of controlled axes, and activating fundamental system options. | | 9920 | Fixed Cycle, Tool Offset, MPG, Unit Conversion | 9920.0 : Fixed Cycle control. 9920.1 : G10 programmable data input for tool offsets. 9920.2 : Mechanical handwheel feed. 9920.5 : Metric/Inch conversion for input [7†L2-L4][8†L4-L9]. | | 9921 | Program Storage Capacity | Defines the available memory for part programs. Values like 9921.0 , 9921.1 , 9921.2 , 9921.3 correspond to memory sizes like 640m, 320m, 160m, 80m, etc., of program storage capacity. | | 9922 | Constant Surface Speed, Macro A, Pitch Error Compensation | 9922.2 : Constant surface speed (CSS) control for spindles. 9922.5 : Stored pitch error compensation for lead screws. 9922.6 : Macro A programming language support. | | 9923 | MDI, Background Editing | 9923.4 : MDI (Manual Data Input) operation mode options. 9923.7 : Background editing, allowing program editing while another program is running. | | 9924 | Language Support | Controls the display language for the user interface, such as 9924.0 : Japanese, 9924.2 : Chinese, 9924.5 : Spanish, etc. | | 9925 | Work Coordinate System, Look-Ahead Control | 9925.1 : Extended number of work coordinate systems (e.g., G54-G59). 9925.3 : Advanced preview (look-ahead) control for high-speed machining. | | 9926 | Tool Offset Memory, Tool Length Measurement | 9926.3 : Tool offset memory for 64 pairs of offsets. 9926.6 : Automatic tool length measurement capability. | | 9927 | Auxiliary Function, Extra Axis | 9927.1 : Second auxiliary (M) code. 9927.3 : Additional axis control. 9927.6 : Tool radius compensation type C for contouring. | | 9928 | Return Speed, 3D Coordinate Conversion | 9928.1 : Setting for reference point return speed. 9928.4 : 3D coordinate conversion for complex geometry transformations. | | 9929 | Graphics, Extended Stroke, External Message | 9929.0 : Graphic display. 9929.2 : Extended internal stroke (soft limit) check. 9929.6 : External user message display | | 9930 | Program Restart, Helical Interpolation, PMC Axis | 9930.1 : Program restart from an interruption. 9930.3 : Helical interpolation. 9930.5 : PMC axis control. | | 9931 | One-Direction Positioning, Rigid Tapping | 9931.0 : One-direction positioning for precise axis location. 9931.2 : Rigid tapping synchronization. | | 9932 | Scaling, Coordinate Rotation, Tool Life Management | 9932.1 : Program scaling. 9932.2 : Coordinate system rotation. 9932.5 : Tool life management. | | 9933 | Polar Coordinates, Macro B, F1-Digit Feed | 9933.1 : Polar coordinate command mode. 9933.7 : Macro B (User Macro language). 9933.3 : F1-digit feed override. |
This is a showing the CNC software version (e.g., 0D03 = Series 0i-D, version 03). If this changes unexpectedly, the firmware is corrupt.
The FANUC 9900 series parameters represent a critical yet restricted set of configuration data within FANUC CNC (Computer Numerical Control) systems. Unlike standard parameters (1000–9000), the 9900 range governs high-level hardware configuration, axis linkage, and software option enablement. This paper provides a comprehensive list of common 9900 parameters, explains their functional domains, details the security protocols required for modification, and outlines safety procedures to prevent unrecoverable machine states. Modifying these without a backup can lead to
Enter MDI or emergency stop state (machine must not move).
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.
typically control standard machine behaviors like axis limits, feed rates, servo tuning, and spindle characteristics.
What are you trying to troubleshoot or verify?
