Fanuc Ot 900 Parameter List [ Plus ]

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

In this article, we will provide the definitive , explain what each parameter does, how to view it, and how to safely use it for backup, recovery, and troubleshooting. What Are FANUC OT 900 Parameters? (The "Option" Parameters) Parameters 900–949 (and sometimes up to 999 depending on the ROM version) are often called "Option Parameters" or "Hardware Configuration Parameters."

For daily operators, your job is to and never modify these values unless under service guidance. For maintenance engineers, understanding bits like 904.7 (PMC enable) and 908.7 (turret type) will save hours of downtime.

| 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 |

Introduction For over four decades, the FANUC Series 0-T (Model C, D, and later) —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.

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.

They are stored in (Static RAM) backed by a battery. If the battery dies, these parameters are lost—and the machine becomes a brick.