provided by the machine tool builder (e.g., Daewoo, Haas, Doosan). Alternative:
: Options for additional "Tape Memory" or part program storage. Advanced Machining : Enabling features like G96 Constant Surface Speed Cylindrical Interpolation High-Speed Cycle Machining System Functions
The FANUC 9900 parameter list is the DNA of the CNC machine tool. While essential for builders and advanced service engineers, these parameters are intentionally protected. Any documentation of 9900 values must be treated as a machine-specific trade secret. When modifying, always assume one wrong digit will require a complete system restore. For standard maintenance, access to 9900 parameters should be avoided unless absolutely necessary.
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
Modifying the 9900 parameter series without authorization can void machine warranties, violate software licensing agreements with FANUC, or render the machine unsafe. For example, enabling a multi-axis option on a machine structural frame not built to handle it can cause catastrophic mechanical collisions.
Many 9900 parameters are displayed as 8-bit binary strings (e.g., 01001011 ). The rightmost digit is . The leftmost digit is Bit 7 .
Tool offset selection (G45-G48), Cylindrical interpolation, Mirror imaging. How to View or Edit Parameters
To view the 9900 parameter list on your FANUC control, you must place the machine in a state that allows system parameter viewing. Select on your operator panel. Press the OFFSET/SETTING key. Press the SETTING softkey.
Set Parameter Write Enable (PWE) to 1 on the SETTING screen to modify these values.
