To edit any parameters, including the 9900 series, you must first enable . This is a fundamental safety feature that prevents accidental changes.

In FANUC CNC systems—particularly modern controls like the 0i-D, 0i-F, 30i, 31i, and 32i series—parameters are categorized by numerical ranges.

Type and press the [INPUT] softkey. (Ignore the resulting P/S 100 ALARM; this is normal). Step 2: Locate the Target Parameter Press the [SYSTEM] function key. Press the [PARAM] softkey. Type 9900 (or your specific target parameter number). Press the [NO. SRH] (Number Search) softkey. Step 3: Input the New Value

: Ensure the machine is in MDI mode or Emergency Stop .

Every machine ships with a manufacturer data sheet or a physical folder located inside the electrical cabinet. This folder contains the original "as-shipped" printout of the 9900 parameters. Always match your screen values to this factory document during troubleshooting.

A machine tool builder sets:

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

In Fanuc CNC systems (such as 16i, 18i, 21i, and 0i series), the are designated as Option Parameters . These control the activation of specific software features and hardware functions that are typically sold as add-on options by Fanuc. Overview of Fanuc 9900 Option Parameters

In many FANUC systems, spindle parameters overlap with the 9900 series, specifically regarding magnetic sensor orientation.

Often, entering a diagnostic mode or a parameter setting mode is required.

: Before changing a single bit, perform a full backup of all parameters (NC, PMC, and Diagnostics) to a PCMCIA card or USB drive.

CNC System Software (OS), PMC Ladder Diagram, Graphic Library Data, Manufacturer-specific custom software. The Parameter "Keep Relay" Diagnostics (PMC)

These are arguably the most used parameters in this range. They allow you to map a custom G-code to a specific macro program number.

These are used to set limits on machine operations to prevent accidental or unauthorized actions, enhancing safety and security.

Axis motion, feed rates, acceleration/deceleration, and servo tuning.

Insert a formatted CF Card (with PCMCIA adapter) or a USB drive into the control panel. Press the key. Press the [PARAM] softkey. Press the [(OPRT)] (Operation) softkey. Press the right arrow softkey to find [PUNCH] .

The following parameters are frequently found in 16i/18i/21i and 0i series documentation for activating advanced features: Bit 0: 640m Storage Bit 1: 320m Storage Bit 4: 40m Storage 9922: Motion Control & Macros Bit 2: Constant Surface Speed Control (G96) Bit 6: Custom Macro A 9923: Operations Bit 4: MDI Operation B Bit 5: Registration for 125 Part Programs Bit 7: Background Editing 9924: Language Displays Bit 0: Japanese Bit 1: German/French Bit 3: Italian Bit 5: Spanish Accessing and Modifying 9900 Parameters