On the Fanuc 0-T, these parameters are often hidden or write-protected.
N0900 P 01100001
Note: The exact map depends on the FANUC OT ROM version (A16B-2200, A16B-2300, etc.). Below is the most common standard for OT-C and OT-D. Parameters are usually displayed in binary (8 bits) from bit 7 (left) to bit 0 (right). fanuc ot 900 parameter list