Check parameter 2020 (Motor Code) and parameter 2023 (Pulse Coder resolution) against the physical motor plates mounted inside your machine tool axis compartments.
: The machine must be in Manual Data Input (MDI) mode or an emergency stop state.
It is crucial to understand that many of the parameters discussed, especially those controlling program editing for 8000-8999 and 9000-9999, are protected by a password system. This is an additional layer of security beyond standard PWE. fanuc 9900 parameter list
The table below compiles the most commonly referenced FANUC 9000 and 9900 series parameters. It is important to note that the exact function of a parameter can vary by control model and system software version. For example, parameter 9900 itself is often used to define the number of axes, but it can have other functions in different contexts. Always cross-reference with your specific machine documentation or contact your machine tool builder for confirmation.
FANUC's parameters are categorized into two distinct groups. The first comprises standard, user-accessible parameters that govern the machine's day-to-day operation. The second is the highly protected group (9000 to 9999), often referred to as "secret parameters" or "function parameters". The 9900 parameter is part of this elite group, which is typically locked by FANUC Inc. and inaccessible for standard editing. These are "option parameters" that activate or deactivate specific hardware features and software options on your CNC control, serving as a digital key. They are stored in a protected area of memory, meaning they are not cleared even when performing a full memory reset or when holding down the RESET button during startup. Check parameter 2020 (Motor Code) and parameter 2023
Modifying system-level parameters can trigger specific initialization alarms. Here is how to address them: Alarm Code / Message Probable Cause Corrective Action PWE bit is still set to 1. Change the PWE value back to 0 on the Setting page. SYS_ALM 900 / 910 MAIN RAM ERROR Incorrect memory allocation value in 9920–9930 range. Reload the original SRAM backup via the Boot screen. P/S 000 PLEASE TURN OFF POWER A system parameter requires a hard reboot to initialize. Cycle the main breaker power switch on the machine. Write Protected / Invalid Input
3rd/4th axis control, Polygon turning, Spindle output switching Advanced Features Custom Macro B, Mirror Image, High-speed skip function Key Functional Bits for 9900 This is an additional layer of security beyond standard PWE
These control the configuration of input/output signals, such as those for tool changers, coolant systems, and spindle control.
Displays the system software series information. 9930
| 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 |
Fanuc considers the 9900 range to be proprietary information. Accessing or modifying these often requires specific conditions: fanuc parameter detail 9900 to 9998 | Practical Machinist