Fanuc intentionally hides 9900-series parameters because:
On many Fanuc controls, you cannot see parameter 9900 unless you enable "Parameter Write Enable" (PWE = 1) and sometimes enter a special mode or key code.
If you have worked with Fanuc CNC controls (Series 0i, 16i, 18i, 21i, 30i, etc.), you have likely scrolled through parameters 0001 to 9999. But when you try to access parameters starting around 9900, you may find them missing or locked. This is because Fanuc parameters 9900 to 9999 are typically configuration parameters for optional hardware, especially serial servos and spindles. fanuc 9900 parameter list
This article explains the purpose of the 9900 series, common parameters you will find there, and the critical precautions for editing them.
These parameters tell the CNC what kind of motor is attached to the axis. Fanuc intentionally hides 9900-series parameters because:
Parameter 9901 (Motor Type):
Parameter 9904 (Motor Orientation/Direction): On many Fanuc controls, you cannot see parameter
If you want, I can: