Enter MDI or emergency stop state (machine must not move).
While the exact mapping of a 9900 parameter can vary slightly depending on the specific FANUC series (e.g., Series 0i versus Series 31i), they generally control advanced software options. Examples of functions tied to these parameter ranges include:
Most parameter changes must be performed while the machine is in Manual Data Input (MDI) mode.
9900 – Axis count 9901 – Extra axis enable 9902 – Spindle type 9904 – High-speed cut 9906 – Software ID (RO) 9913 – Macro enable 9930 – Password lock 9970 – Option mask 9999 – Security checksum
Understanding the underlying parameters and memory structures associated with this alarm is essential for diagnosing the root cause, recovering lost data, and getting your machine tool back into production. 1. What is FANUC Alarm 9900? fanuc 9900 parameter list
In Fanuc CNC control systems, the (often referred to as Option Parameters ) are specialized settings used to enable or disable software-based features and hardware options. Unlike standard user parameters (e.g., feed rates or travel limits), these are typically restricted and managed by the Machine Tool Builder (MTB) or Fanuc directly. Core Function of 9900 Series Parameters
Because these parameters govern fundamental system operations, FANUC locks them behind safety walls to prevent accidental deletion. Follow these steps to view your 9900 parameter list:
Understanding the FANUC 9900 Series Parameters: Function, Access, and Safety in CNC Maintenance
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 . Enter MDI or emergency stop state (machine must not move)
FANUC 9900 Parameter List: Complete Guide to System Configuration
Unlike volatile operational parameters, option parameters are deeply integrated into the system's FROM/SRAM memory.
(e.g., 16i, 18i, 21i, 0i-M/T). These are often referred to as "Option Parameters" or "Option Bits." ⚠️ Crucial Safety Warning
For complex multi-turret lathes or 5-axis machining centers, the 9900 parameters control: Polar Coordinate Interpolation Cylindrical Interpolation Tool Center Point Control (TCP / 5-axis transformation) 4. Custom Macros and Interfacing 9900 – Axis count 9901 – Extra axis
Even with PWE set, FANUC and the MTB use additional locks to protect the 9000-9999 series:
Ignore the flashing P/S alarm that appears (this is normal and expected). Step 2: Accessing the System Parameter Screen Press the hard key. Press the [PARAM] soft key. Type 9900 and press the [No. SRH] (Number Search) soft key.
2. Critical Memory Parameters & Diagnostics Linked to Alarm 9900
Enter parameter number and press NO.SRH .