900 Parameter List — Fanuc Ot
The Silent Architecture: An Essay on the Fanuc 0-T 900 Series Parameters
Hardware Interface
: They manage physical machine capabilities, such as enabling the manual pulse generator (handwheel) for fine adjustments or expanding tape memory (Parameter 901) for larger program files. fanuc ot 900 parameter list
- The PMC ladder program burned into your ROMs (EPROMs)
- The specific servo amplifier models (α, β, or older)
- The spindle drive type (FANUC, Yasikawa, etc.)
- The tool changer logic written by the machine builder
- PWE not enabled — follow diagnostics/password procedure.
- Alarm 100/101 after write — power cycle and verify parameter persisted; if not, revert to backup and contact service.
- Attempting to set unsupported option bit — control may ignore change or throw errors; verify installed hardware/options.
900 through 939
Most operators know parameters 000–899: axis gains, acceleration times, RS232 settings. But parameters are different. They are option parameters – they tell the CNC what hardware and software features are installed. The Silent Architecture: An Essay on the Fanuc
, are high-level system variables ranging from 900 to 999. These bits control the fundamental software features and machine capabilities that are often sold as optional add-ons by the manufacturer. Google Groups Accessing and Editing 900 Parameters The PMC ladder program burned into your ROMs
0: Serial Spindle Interface (Uses digital fiber optic cables to the spindle amp - standard on Alpha drives).1: Analog Spindle Interface (Uses 0-10V analog voltage signal - common on older drives or third-party spindles).
- 911: Spindle analog output gain / acceleration time
- 912: C-axis contouring enable (for live tooling lathes)
- 913: Number of PMC diagnostic timers (TPM)
- 914: Number of PMC keep relays (K00–K99)
- 920: Graphics display (option for toolpath simulation)
- 921: Background edit enable
- 922: Multiple program storage (greater than 63 programs)
- 930: High-speed machining (AI contour control – bit 7)
- 931: Nanometer interpolation (bit 0) – rare on OT
- 940: Extended part counter with batch processing
- 941–949: Machine builder specific – vary by OEM (Okuma, Hardinge, etc.)