Need help finding the right parameter for your specific Fanuc model? Leave your control series and motor type in the comments.
Type 9900 using the keypad and press the (Number Search) softkey.
When diagnosing, configuring, or upgrading a CNC machine equipped with a FANUC control system (such as the 16i, 18i, 21i, 0i-C, or 0i-D series), you will eventually encounter the . Unlike standard operational parameters that dictate axis speed or acceleration, the 9900 parameters serve a highly specialized purpose: they manage system options, software functional extensions, and core CNC configurations.
: Since these are often tied to paid software options, Fanuc typically uses specialized software (like EZOPT) to load them; manual entry by users is not recommended for core system configurations. exact bit definitions for a specific control model like the 16i or 0i-TD? Thread: Disabling C axis on Fanuc 21i-MB - Industry Arena fanuc 9900 parameter list
When is it actually appropriate to use this list?
In the context of CNC systems, a parameter list refers to a collection of numerical values that define various aspects of the system's behavior and performance. These parameters can be adjusted and configured to tailor the system's operation to specific machining requirements, such as setting tool offsets, defining motion profiles, and configuring I/O interfaces. The parameter list is essentially a database of settings that control the CNC system's functions, and modifying these parameters can significantly impact the system's performance and accuracy.
Dictates the slow rapid override speed when the operator selects the lowest rapid tier on the control panel. Need help finding the right parameter for your
This article provides a deep dive into the Fanuc 9900 parameter list, how to access it, common codes, safety precautions, and real-world troubleshooting.
Older controls (like the 0-M or 0-T) used the 900 series (900–939) for options. If you see 8-bit binary strings (e.g., 00010000 ), you are likely looking at these legacy option bits.
Go back into the Boot Menu and select to load your .SND or .SRA backup file. When diagnosing, configuring, or upgrading a CNC machine
Modifying system parameters can cause unpredictable machine movement, tool crashes, or permanent damage to the CNC hardware.
Constant Surface Speed Control (G96), Tool Life Management, Macro B, Rigid Tapping