In Fanuc 0-T controls, the 900-series parameters are . They define the fundamental architecture of the machine.
It looked like this (hypothetical, for a Takumi lathe): fanuc ot 900 parameter list
(and all others) via RS232 to a PC, and print the 900 list on paper. Old Fanuc OT controls can’t be backed up with a USB stick. In Fanuc 0-T controls, the 900-series parameters are
Unlike standard parameters (which adjust feedrates or offsets), 900 parameters tell the CNC control: Old Fanuc OT controls can’t be backed up with a USB stick
| Machine Builder | Typical 900 Params (examples) | Notes | |----------------|--------------------------------|-------| | (OSP 7000L) | 906 bit 0=1 (dogless reference), 908 bit5=1 (shortest path turret) | Uses absolute encoders – 900 params must match encoder type | | Mori Seiki (SL series) | 907 bit6=1 (rigid tapping), 910 bit7=1 (4th axis live tooling) | Heavy use of 904 PMC ladder protection | | Hardinge (T42, Conquest) | 902 bits 7-6=10 (PMC-R), 908 bit3=1 (random tool selection) | Unique tool changer logic tied to param 941-944 | | Haas (HL-1, HL-2 – early models) | 905 bit7=1 (custom macro), 909 bit4=1 (DNC with no parity) | Haas used modified FANUC OT firmware – check service manual |