| Bit | Function | |------|-----------| | 7 | 0 = PMC ladder edit disabled, 1 = enabled (use with extreme caution) | | 6 | Parameter write via MDI disable | | 5 | Backup ROM writing enable | | 4 | CNC data save to memory card | | 3 | Boot system modification lock | | 2-0 | Reserved (usually 000) |

When standard troubleshooting fails, the becomes your most powerful diagnostic tool.

The Fanuc OT 900 parameter list varies by:

The turret solenoid clicked once.

Here is the .

Parameters in the 900-range (typically 900-939) are . Each parameter is an 8-bit byte (bits 0-7), where each bit acts as a switch (1 = Enabled, 0 = Disabled). How to Access and Change 900 Parameters Enter MDI Mode: Switch to MDI. Go to Parameters: Press the PARAM button.

FANUC distinguishes between and confidential (option) parameters . Public parameters (such as 100, 101, 1320, 1321, etc.) are fully documented in official manuals and concern basic machine settings like axis acceleration, feedrates, and limit switches. However, the 900 parameters are different. As one expert explains: "Since the 900 range parameters set the options and configuration of the control, they are not officially published" . Because 900 parameters represent purchased options (features that cost extra), FANUC has historically been reluctant to publish a master list. These settings are described as "密级型参数" (confidential parameters) because they are state-type parameters without names, symbols, or provided explanations.

Always obtain the original builder’s 900 parameter list from the machine’s electrical schematic or a full SRAM backup file ( .000 extension).

Often controls options such as 4-axis control, expanded part program editing, and constant surface speed.

Do this today if you operate an old FANUC OT lathe:

He powered off. Counted ten seconds. Powered on.

If you want to edit a second program while the first is running (mass production), set .

Activates G70–G76 canned cycles (multiple repetitive cycles like roughing and threading). Bit 3: Enables drilling canned cycles (G80–G89).

0903 0 0 1 1 0 0 1 0

Each parameter is an 8-bit byte (bits 0–7). Below are some of the standard definitions often found on your paper copy: Description Canned Cycles (G80–G89) G10 Program Input of Offset Inch / Metric Conversion Multiple Repetitive Canned Cycles (G70–G76) Tape Memory Additions (20M to 320M) Chamfering and Corner Radius Reader/Puncher Interface Control Constant Surface Speed Control (G96/G97) Actual Spindle Speed Output Language selection (Japanese, German, French, Chinese) PMC Model selection (Model L, Model M 3000/5000 step) How to Enter Parameters from Your Paper Copy Fanuc Ot 900 Parameter List - Google Groups