You cannot change parameters while the machine is running or in Jog mode.
A "P/S 100" alarm will appear; this is normal when PWE is active.
This guide provides a comprehensive overview of the , which controls the optional features and software configuration of the legendary Fanuc 0-T (and 0-TC/0-TD) CNC controllers commonly used on lathes and turning centers.
Below are the primary option parameters for the 0-T control. Each parameter consists of 8 bits (labeled 7 to 0 from left to right). Description Canned Cycle (Basic) G10 Program Input of Offset Inch / Metric Conversion Special G Code Tape Memory Addition (120m) Chamfering / Corner Radius Multiple Repetitive Canned Cycles (G70-G76) Constant Surface Speed Control Stored Pitch Error Compensation Custom Macro A Actual Spindle Speed Output Number of Programs (Set to 125) Soft Keys Below CRT fanuc ot 900 parameter list
Properly understanding these parameters allows maintenance personnel and operators to enable specific CNC capabilities, troubleshoot communication issues, and optimize machine performance. What Are Fanuc 900-Series Parameters?
The "FANUC OT 900 Parameter List" is more than just a collection of numbers; it is the key to your machine's capabilities and a frequent source of confusion during repairs. While finding a universal list is impossible, understanding the purpose and structure of these parameters empowers you to maintain, backup, and troubleshoot your legacy FANUC 0T-controlled equipment. Whether you are reactivating a long-dormant machine or fine-tuning a daily workhorse, treat the 900 parameters with the respect they command—for they truly define your machine's digital soul.
Enables cylindrical interpolation (G07.1) for rotary axis milling. Bit 4: Activates tool geometry and wear offsets. Parameter 916: Communication and Interface You cannot change parameters while the machine is
✅ Diagnose why certain G-codes don't work ✅ Restore purchased options lost during battery failure ✅ Unlock productivity features (rigid tapping, DNC, macro B) ✅ Avoid costly service calls for 5-minute parameter changes
| :--- | :--- | :--- || | 0 | Canned Cycle (G70-G76) || | 1 | G10 Program Input of Offset || | 3 | Manual Pulse Generator (Handle) || | 5 | Inch / Metric Conversion || 901 | 1 | Tape Memory Addition (120M) || | 5 | Chamfering and Corner Radius || | 7 | Multiple Repetitive Canned Cycles || 902 | 2 | Constant Surface Speed (G96/G97) || | 6 | Custom Macro A || 903 | 1 | X-Axis Mirror Image || | 7 | Soft Keys (Below CRT) || 910 | 1 | Work Offsets (G54–G59) || 911 | 2 | Rigid Tapping || 912 | 0 | 3rd / 4th Reference Point Return | How to Edit 900-Series Parameters Fanuc 900 Parameter List Overview | PDF - Scribd
With the machine in MDI mode, PWE (parameter write enable) set to 1, and the emergency stop engaged, Marco carefully entered each 900 parameter manually from the sheet. Below are the primary option parameters for the 0-T control
Activates custom macro B functionality, allowing variables and logic statements in G-code. Parameter 907: Interpolation and Coordinate Systems
| Bit | Name | Function | | :--- | :--- | :--- | | 0 | A | ROM version A | | 1 | B | ROM version B | | 2 | C | ROM version C | | 3 | D | ROM version D | | 4-7 | - | Reserved for Fanuc factory use. Changing these WILL crash the system. |
The display flickered.
Never change the 900 parameters arbitrarily. If you enter an invalid combination, the control may display "ROM PARITY ERROR" or fail to boot.
The FANUC OT 900 parameter list is extensive, with over 1,000 parameters available. Here is a comprehensive list of some of the most commonly used parameters: