Cycle the main power of the CNC machine (Power OFF, wait 10 seconds, Power ON) to force the control unit to initialize the newly activated features. Critical Safety Warnings
The control will trigger a P/S 100 ALARM (Parameter Write Enable) . This is normal and acts as a safety warning. Step 3: Access and Modify the 900 Parameters Press the function key to view the parameter page. Type 900 and press the NO.SRH (Number Search) softkey.
Unlike standard 000–899 parameters that control feedrates, axis assignment, and user preferences, the (often referred to as Fanuc OT 900 parameters) governs the hardware configuration , software options , and built-in PMC (Programmable Machine Controller) diagnostics . Modifying these incorrectly can crash your machine—but understanding them can resurrect a dead control.
For over four decades, the —commonly known as the FANUC OT control—has been the backbone of CNC lathes worldwide. From Okuma to Mori Seiki, Hardinge to Haas’s early lathes, this control is legendary for its reliability. However, even the most robust systems encounter issues: mysterious alarms, sudden halts, or a machine that simply refuses to power up. fanuc ot 900 parameter list
| Bit | Function | |------|-----------| | 7 | 4th axis (A axis) present: 0=no, 1=yes | | 6 | 4th axis rotary (indexing table) | | 5 | 4th axis contouring (simultaneous movement with X/Z) | | 4 | 4th axis home direction | | 3 | Axis name display (0 = A, 1 = B) | | 2-0 | Step motor vs. servo motor |
Often dedicated to controlling communication interfaces like RS232, enabling drip-feeding (DNC), or controlling tape operations. ⚠️ Critical Safety Warning: Back Up Your Parameters
The Fanuc OT (also written as Fanuc 0T) is one of the most iconic and widely used CNC controls for lathes and turning centers. Despite being introduced in the mid-1980s, thousands of machines worldwide still rely on this resilient, workhorse control. Cycle the main power of the CNC machine
Allows editing one program while running another. Restoring Parameters from a Backup
Many second-hand lathes come with Macro B disabled. Check . If zero, set it to 1, and suddenly you can use #100 = #101 + 1 and WHILE [#1 LT 10] DO1 .
He powered off. Counted ten seconds. Powered on. Step 3: Access and Modify the 900 Parameters
The 900 parameters are essentially the "firmware" settings of your lathe. While it's tempting to "turn everything on," incorrect settings can cause system crashes or render the machine unresponsive. before making changes, as many older 0-T controls do not have a "factory reset" button that restores these specific bits. Fanuc Ot 900 Parameter List - Google Groups
| Bit | Name | Function | | :--- | :--- | :--- | | 0 | HLP | Help function (on-screen assistance) | | 1 | SCH | Schedule program (multi-job management) | | 2 | TAP | Tape mode editor | | 3 | LDP | Load / unload parameter (PMC ladder transfer) | | 4 | MDC | Manufacturing data capture (production counters) | | 5 | DRV | Driver monitor (servo waveform display) | | 6 | PRT | Parameter trace (diagnostic logging) | | 7 | ALM | Alarm history storage |
. Unlike standard configuration parameters, these are stored in a binary format where each 8-bit parameter (numbered 900 to 999) represents eight distinct features. Key 900-Series Parameters
Understanding Fanuc 0-T 900 Series Option Parameters The Fanuc 0-T 900 series parameters, often referred to as Option Parameters