In Fanuc CNC systems (such as the Series 16i, 18i, 15, and 21), Parameter 9900 marks the beginning of the "Option Parameters" range, extending through 9999. These parameters are critical as they enable or disable specific software features and hardware integrations. Overview of the 9900 Series Parameters
The "900" Series vs. 9900: 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.
The FANUC 9900 parameter list is crucial for several reasons: fanuc 9900 parameter list
Why? If you accidentally toggle a bit in the 9900 range that disables your axis communication, you cannot simply "undo" it. You may need to perform a full system restore from a backup memory card or floppy disk to get the machine running again.
Press PARAM softkey (or go to Parameter screen). In Fanuc CNC systems (such as the Series
Modification: You generally cannot change these manually. Enabling new options usually requires paying Fanuc for an "option file" that is loaded via memory card.
**Parameter 9940s (
Visibility: On Fanuc controls made after mid-2006, the 9900 series parameters are often hidden or stored on a FROM card, making them impossible to edit through the standard MDI screen.