Use these categories to locate settings quickly. Exact parameter numbers may vary by Fanuc 9900 firmware and machine builder options; always consult your machine-specific manual.
In many FANUC systems, spindle parameters overlap with the 9900 series, specifically regarding magnetic sensor orientation.
Parameter 9918 & 9919 (Spindle Orientation Stop Position):
**Parameter 9940s (
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
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. fanuc 9900 parameter list
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.
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!
Understanding Fanuc 9900 Series Option Parameters The Fanuc 9900 series parameters are designated as Option Parameters on modern Fanuc CNC controls, such as the 16i, 18i, 21i, and 0i series. Unlike standard machining parameters, these bits enable or disable core system functions like additional memory, high-speed machining, and specialized canned cycles. Key Functionality Highlights
The 9900 range typically controls high-level system configurations. Common options found in this range include:
Memory Expansion: Parameters like 9921 control part program storage capacity, ranging from 40m to 640m.
Programming Features: Enabling Helical Interpolation (9925.0) or Custom Macro B (9926.7).
Axis & Spindle Control: Managing Spindle Synchronization (9926.1) or simultaneous 4-axis control (9926.5).
Tooling Options: Expanding tool offset memory to 64 or 99 pairs (9926.3, 9926.4). Crucial Access Warning
Proceed with extreme caution. On controls manufactured after July 2006, Fanuc significantly restricted access to the 9900 series.
Visibility: These parameters often do not appear on the standard parameter screen and are instead hidden within a diagnostic screen.
Modification: You generally cannot change these manually. Enabling new options usually requires paying Fanuc for an "option file" that is loaded via memory card.
Risk: Incorrectly modifying these bits can cause fatal system errors, requiring a full memory clear and restoration from backups. Sample Parameter Bit List
Below is a selection of commonly cited 9900-series bits for the 16i/18i/21i controls: Parameter.Bit Description 9920.1 Tool offset input with G10 9920.5 Inch/Metric conversion 9922.2 Constant surface speed control 9922.6 Custom Macro A 9925.3 Look-ahead control (High-speed machining) 9926.7 External tool compensation 9937.4 Extra Macro Variables How to Check Your Current Options
If your control allows viewing, you must first enable Parameter Write Enable (PWE): Set the machine to MDI Mode. Press the OFFSET/SETTING key.
Change PARAMETER WRITE from 0 to 1 (this will trigger an alarm, which is normal). The Essential Guide to the Fanuc 9900 Parameter
Navigate to the SYSTEM -> PARAMETER screen and search for 9900.
For a comprehensive official list, refer to the Fanuc Parameter Manual specific to your control model.
In Fanuc CNC systems (such as 16i, 18i, 21i, and 0i series), the 9900 series parameters are designated as Option Parameters. These control the activation of specific software features and hardware functions that are typically sold as add-on options by Fanuc. Overview of Fanuc 9900 Option Parameters
Unlike standard system parameters, 9900 series parameters (and their predecessors, the 900 series) are often protected or hidden to prevent unauthorized activation of paid features.
Pre-July 2006 Controls: Parameters in the 9900 range were often visible and editable on the machine's parameter screen.
Post-July 2006 Controls: Fanuc "locked" these parameters. They are typically stored in FROM (Flash ROM) and viewed via a diagnostic screen rather than the standard parameter screen. Modifications usually require a specific authorization file provided by Fanuc after the option is purchased. Common 9900+ Series Parameters & Functions
The 9900 parameters are bit-configured (0 or 1) to enable specific features. Below is a sample of common functions typically found in these tables: Parameter Range Function Examples Memory Options
Additional part program storage (e.g., 40m, 80m, 320m memory expansion) Control Features
Constant Surface Speed Control (G96), Tool Life Management, Macro B, Rigid Tapping Axes & Motion
Additional axis control (4th/5th axis), Axis mirroring, Circular interpolation Display/Interface
Graphics display, Conversational programming (Manual Guide i), Background editing How to Access and Edit (General Procedure)
If your control allows editing (pre-2006), the process generally involves:
Enable PWE: Go to the SETTING screen and set Parameter Write Enable (PWE) to 1 (this will trigger an alarm, which is normal).
MDI Mode: Ensure the machine is in MDI mode or Emergency Stop.
Navigate: Use the SYSTEM function key and then the PARAM soft key to find the 9900 series.
Enter Value: Change the required bit and press INPUT. A power cycle is usually required for changes to take effect. Reference Documentation
Detailed lists for specific control models are often found in official Fanuc Parameter Manuals, such as: fanuc parameter detail 9900 to 9998 | Practical Machinist
In the world of Fanuc CNC maintenance, Parameter 9900 and its surrounding series (9900–9999) are often considered the "engine room" of the control's configuration. These are the Option Parameters, which dictate what high-level features—like 4th-axis control, helical interpolation, or Macro B—are actually active on your machine. 🛠️ Essential Fanuc 9900 Series Parameters
On modern "i" series controls (like the 16i, 18i, and 21i), the 9900 series is used primarily for system-level hardware and option configuration. Parameter # Common Function / Meaning 9900
Number of Axes/Amps: Often used to define the number of servo amplifiers the control should recognize. 9921
Software Version: Displays the system software series information. 9930 System / General
Macro B Options: Often tied to enabling custom macro variables and logic. 9937
Helical Interpolation: Enables circular movement across three axes simultaneously. 💡 Troubleshooting with Parameter 9900
One of the most practical uses for Parameter 9900 is resolving Alarm 5136 (Number of Amps is Small). This alarm occurs when the CNC expected more servo drives than it found on the fiber optic link.
The Fix: You can temporarily change Parameter 9900 to a lower value (e.g., 1 or 2) to bypass missing drives while testing individual servo modules. The Workflow: Enable Parameter Write Enable (PWE). Change 9900 to the number of drives currently connected.
Power cycle to see if the alarm clears for the remaining healthy drives. ⚠️ Important Considerations
Visibility: On Fanuc controls made after mid-2006, the 9900 series parameters are often hidden or stored on a FROM card, making them impossible to edit through the standard MDI screen.
The "900" Series vs. 9900: Older controls (like the 0-M or 0-T) used the 900 series (900–939) for options. If you see 8-bit binary strings (e.g., 00010000), you are likely looking at these legacy option bits.
Backup First: Changing these parameters can render a machine inoperable or cause unpredictable motion. Always perform a full SRAM backup before touching the 9900 series. How to Proceed
If you need to unlock a specific feature or clear a hardware alarm, let me know: Your Control Model (e.g., 18i-MB, 0i-TF, or 16M) The exact alarm code you are seeing
The specific function you are trying to enable (e.g., 4th axis, Ethernet, or High-Speed Machining)
I can provide the specific bit-level settings or the Parameter Manual references for your exact system. Fanuc Parameter Options Overview | PDF | Computing - Scribd
In Fanuc CNC systems, parameters in the 9900 series (specifically 9900–9999) are designated as Option Parameters
. These parameters control the activation of factory-installed software features and hardware capabilities, such as additional memory, simultaneous axis control, or custom macro functions. Report: Fanuc 9900 Series Option Parameters 1. Purpose and Function
The 9900 series parameters are used to enable or disable specific CNC options. Unlike standard parameters (like feed rates or axis limits), these are typically set by the machine tool builder (MTB) or Fanuc based on the purchased software package. Activation
: These are often bit-based parameters where each individual bit (0–7) corresponds to a different feature. : On controls newer than mid-2006, these are stored in Flash ROM (FROM)
, meaning they are not typically lost even if the main SRAM backup battery fails. 2. Common Parameter Examples (Control Dependent)
The exact function of a 9900 parameter varies by control model (e.g., 0i, 16i, 31i). Below are common examples found in standard lists: Parameter No. Description Often defines the total number of controlled axes. Tape Memory Addition (e.g., 120M). Custom Macro A activation. Spindle Speed Fluctuation Detection. X-axis Mirror Image. PMC Model selection (L, M, etc.). 200 Registerable Programs. 3. Access and Visibility Modern Controls (Post-2006)
: Often hidden from the standard parameter screen. They are frequently found in the Diagnostic screen or require a specific Fanuc "EZOPT" file to modify. Older Controls : May be viewable in the standard parameter list if Parameter Write Enable (PWE) is set to 1. Google Groups 4. Critical Warnings
fanuc option parameters - CNC Machining - Practical Machinist
If you are a CNC machinist or a maintenance technician, you have likely heard whispers about Fanuc Parameter 9900. In the world of Fanuc controls, this specific parameter range is often shrouded in mystery. It is frequently referred to as the "hidden" or "secret" parameter list.
Unlike standard parameters (like 0000-0899) that control basic machine functions such as inch/metric mode or mirror image, the 9900 series resides in a different tier of the control’s architecture.
In this post, we break down what the 9900 parameters are, why they matter, and why you should approach them with extreme caution.