Fanuc - Ot 900 Parameter List
It looks like you are diving into the "heart" of an older Fanuc control. The Fanuc 0T (Series 0-T) is a legendary workhorse, and Parameter 900 is a particularly interesting place to start because it marks the beginning of the Option Parameters (Bit patterns) in many memory layouts.
Part 5: Common Real-World Use Cases for the 900 List
Case 1: Drip Feeding Large Programs (DNC)
If your machine has a small memory but a large program, check Parameter 902, Bit 7 (DNC). If set to 0, change it to 1, and you can use Tape Mode with # or % for continuous RS-232 streaming.
Step 4: Load the remaining parameters (0–800+) via RS232 or manual entry. 💡 Troubleshooting Tips fanuc ot 900 parameter list
Parameter 907 – High Speed Skip & Tapping
| Bit | Function | |------|-----------| | 7 | High-speed skip signal (G31 with P) enable | | 6 | Rigid tapping (M29) enable – very common on lathes | | 5 | Synchronous tapping with floating chuck | | 4 | Skip signal noise filter | | 3 | Retract after skip | | 2-0 | Skip input logic: 000 = skip via X4.7, 001 = X1.2, etc. |
Where to find authoritative lists and manuals It looks like you are diving into the
Troubleshooting Using 900 Parameters
| Symptom | Likely 900 Parameter Issue | Fix |
|---------|----------------------------|-----|
| SV0400, SV0410 alarm on power-up | 903 bits 7-6 wrong (servo type mismatch) | Change analog/digital to match actual drives (e.g., α series = digital). |
| Turret won’t index; no PMC signals | 908 bits 7-4 incorrect | Check if turret is hydraulic (bit7=0) or servo (bit7=1). |
| M19 orientation spins but doesn’t stop | 901 bit7=0 (orientation disabled) | Set to 1. Also check 912 bits for encoder feedback. |
| Alarm PMC SYSTEM ALARM 20 | 902 bits 3-0 wrong (diagnostic memory size) | Increase memory size (e.g., from 4K to 8K). |
| Cannot edit ladder | 904 bit7=0 | Set to 1 ONLY for editing, then return to 0. |
| No live tool indexing (C axis) | 900 bit5=0 (C axis missing) | Set binary to include C axis. Also enable param 912. |
Symptom: Macro programs run but give #0 variable errors
- Cause: You have Macro A (902.7) but need Macro B (903.0) for expressions. Enable both.
Fanuc OT 900 Parameter List: Categories and Descriptions Cause: You have Macro A (902
The Fanuc 0-T 900 series parameters are critical "option parameters" that enable or disable internal software features and hardware interfaces of the CNC controller. These settings are typically protected and require specific procedures to modify. Key 900-Series Option Parameters