Modifying 900-series parameters is risky. These settings are typically factory-locked because they dictate the machine's core capabilities. Incorrectly changing a bit can cause system crashes or disable essential safety features. Always back up your parameters (via RS232 or PCMCIA) before making any changes. these parameters using the RS232 interface Fanuc Ot 900 Parameter List - Google Groups
Based on technical documentation, here is a snapshot of what these bits actually control: Description Functionality Unlocked CANNED CYCLE Enables standard G-code cycles like G81/G83. 900 G10 PROGRAM INPUT Allows software to update offsets automatically. 900 INCH / METRIC Toggle between imperial and metric measurement systems. 901 TAPE MEMORY Controls memory capacity (from 20M to 320M). 901 CHAMFER/RADIUS Enables corner rounding/chamfering G-codes. 902 CONSTANT SURFACE Allows the spindle to adjust speed based on diameter. 902 CUSTOM MACRO A Unlocks the ability to use variables and logic. 903 Enables the dynamic buttons below the CRT screen. 904 Changes the system text (Japanese, German, Spanish, etc.). How to "Unlock" These Settings fanuc ot 900 parameter list
On many 0T controls, this parameter is often the first in the option block. It is a parameter (8 bits, 0-7). Modifying 900-series parameters is risky
0903 0 0 1 1 0 0 1 0