Fanuc 9900 Parameter List ((exclusive))

Are you currently seeing any on the screen?

This is the master switch for protecting 9000-series programs. If bit 4 is set to

Press the OFFSET/SETTING key, then navigate to the Setting screen.

The control lost memory storage integrity while editing parameters or loading an external program text file. fanuc 9900 parameter list

While specific machine builders modify these values for custom setups, understanding core FANUC system parameters allows you to troubleshoot system errors, change communication protocols, and optimize machine performance. The Core Concept of FANUC System Parameters

These often relate to basic machine settings, such as pulse per millimeter/inch, and maximum feed rates.

FANUC 9900 parameters are generally formatted as . This means that a single parameter number (e.g., 9900) contains 8 individual bits, labeled from Bit 0 to Bit 7. Are you currently seeing any on the screen

| 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. |

While standard servo parameters usually cause this, corrupted option parameters related to axis configuration or high-speed machining functions within the 9900 range can also throw a 417 alarm. Check if an axis option was enabled without the corresponding hardware or basic servo parameters being initialized. Alarm 998 / SYSTEM ALARM (ROM/RAM Parity)

In the hierarchy of FANUC CNC parameters, the represents the "nerve center" of the machine’s motion control. While standard parameters (8000s and 9000s) handle general machine data, the 9900 series specifically governs Digital Servo and Spindle Motor characteristics . The control lost memory storage integrity while editing

: 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

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

If a 9900 parameter is modified incorrectly or contains an invalid bit sequence not supported by the physical mainboard/FROM module, the system may crash upon reboot with a critical system alarm. To recover, you must clear the memory and reload your original SRAM backup or parameter text file. Important Legal and Safety Warning

The is primarily dedicated to System Option Parameters (often referred to as CNC optional functions or bit parameters). These parameters act as digital toggle switches that enable or disable specific software features built into the FANUC control system. The Role of Option Parameters