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9900 Parameter List | Fanuc

Before you even look at the 9900 parameters, you must have a complete backup of your machine's SRAM (Static RAM).

Why? If you accidentally toggle a bit in the 9900 range that disables your axis communication, you cannot simply "undo" it. You may need to perform a full system restore from a backup memory card or floppy disk to get the machine running again.

Best Practice: Always perform a "Series 16/18i Data Backup" to a compact flash card or USB stick before accessing system-level parameters.

The Fanuc 9900 (Fanuc Series 0i/16/18/21/30 family derivatives sometimes labeled 9900 in documentation) parameter list controls machine behavior, axis configuration, servo tuning, I/O mapping, interpolation, safety limits, and more. Below is a comprehensive reference grouped by function. Use caution: changing parameters can make equipment unsafe or inoperable. Back up current parameter values before editing. fanuc 9900 parameter list

Rotate the mode selector to MDI (Manual Data Input).

| Bit | Function | |------|------------| | #0 | 0 = 3 axes max, 1 = 4 axes or more | | #1 | 0 = No Cs contouring, 1 = Cs contouring enabled | | #2 | 0 = No spindle sync, 1 = Spindle synchronization (e.g., rigid tapping) | | #7 | Master/slave axis pairing |

In the hierarchy of FANUC CNC parameters, the 9900-series 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. Before you even look at the 9900 parameters,

These parameters define how the CNC controls the torque, speed, and position loops of the drive amplifiers. They are typically set during the initial machine build by the MTB (Machine Tool Builder) and are unique to the specific motor/amplifier combination.

In Fanuc controls (specifically Series 16, 18, 21, 16i, 18i, and 21i), the 9900 parameter range is reserved for System Configuration and Option Activation.

Think of the 9900 parameters as the "master keys" to the control. While standard parameters determine how the machine moves (speeds, feeds, accelerations), the 9900 parameters determine what the machine is capable of doing. Parameter 9901 (Motor Type):

These parameters tell the CNC what kind of motor is attached to the axis.

  • Parameter 9901 (Motor Type):

  • Parameter 9904 (Motor Orientation/Direction):

    • Before you even look at the 9900 parameters, you must have a complete backup of your machine's SRAM (Static RAM).

    Why? If you accidentally toggle a bit in the 9900 range that disables your axis communication, you cannot simply "undo" it. You may need to perform a full system restore from a backup memory card or floppy disk to get the machine running again.

    Best Practice: Always perform a "Series 16/18i Data Backup" to a compact flash card or USB stick before accessing system-level parameters.

    The Fanuc 9900 (Fanuc Series 0i/16/18/21/30 family derivatives sometimes labeled 9900 in documentation) parameter list controls machine behavior, axis configuration, servo tuning, I/O mapping, interpolation, safety limits, and more. Below is a comprehensive reference grouped by function. Use caution: changing parameters can make equipment unsafe or inoperable. Back up current parameter values before editing.

    Rotate the mode selector to MDI (Manual Data Input).

    | Bit | Function | |------|------------| | #0 | 0 = 3 axes max, 1 = 4 axes or more | | #1 | 0 = No Cs contouring, 1 = Cs contouring enabled | | #2 | 0 = No spindle sync, 1 = Spindle synchronization (e.g., rigid tapping) | | #7 | Master/slave axis pairing |

    In the hierarchy of FANUC CNC parameters, the 9900-series 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.

    These parameters define how the CNC controls the torque, speed, and position loops of the drive amplifiers. They are typically set during the initial machine build by the MTB (Machine Tool Builder) and are unique to the specific motor/amplifier combination.

    In Fanuc controls (specifically Series 16, 18, 21, 16i, 18i, and 21i), the 9900 parameter range is reserved for System Configuration and Option Activation.

    Think of the 9900 parameters as the "master keys" to the control. While standard parameters determine how the machine moves (speeds, feeds, accelerations), the 9900 parameters determine what the machine is capable of doing.

    These parameters tell the CNC what kind of motor is attached to the axis.

  • Parameter 9901 (Motor Type):

  • Parameter 9904 (Motor Orientation/Direction):