These control the built-in PLC (Programmable Logic Controller) logic for M-codes, T-codes, interlock signals, and coolant valves. Modifying these without ladder diagram documentation will break the machine.
| Symptom | Check Parameter | |---------|----------------| | Axis moves wrong direction | 0012 bits | | No spindle speed display | 0500, 0510 | | RS-232 not communicating | 0001, 0020, 0021 | | Cannot change parameters | 8000.0 (PWE=1) | | Tool offset not applying | 0600–0640 format bits |
End of Reference Sheet – Print this and keep near the machine electrical cabinet.
Always verify exact values against your machine’s original FANUC 11M blue book.
1000–1005: Axis attribute (type, direction, name: X,Y,Z,4,5).1200–1203: Positive stroke limit (stored stroke limit 1).1240–1243: Negative stroke limit (stored stroke limit 2).1300–1303: Reference position coordinates in machine coordinate system.Because the 11M is old, the full parameter list is in the official Fanuc 11M Model A Operator’s Manual (B-53583E) and Maintenance Manual (B-53584E). These are available as scanned PDFs from:
⚠️ Important: Never change option parameters (0000–0099) without the original machine builder’s parameter backup. Doing so can disable axes, crash the servo system, or corrupt the control.
The Fanuc 11M parameter list contains thousands of settings that control everything from basic machine axes to complex communication protocols. Because a full list is too large to display here, the most critical "common" parameters are categorized below. Critical Setup Parameters
0000–0030 (Setting Parameters): These include PWE (Parameter Write Enable), which must be set to 1 to change any other parameters. You can find instructions on enabling PWE on MachineMetrics.
1000–1100 (Axis Control): These define the number of axes, axis names (X, Y, Z), and whether an axis is linear or rotary.
1240–1241 (Reference Points): These store the machine coordinate values for the first and second reference points (Home positions). CNCMakers notes that 1240 is for the first point and 1241 for the second. I/O and Communication (RS-232) fanuc 11m parameter list
To transfer programs, these parameters must match your PC settings:
5001: I/O device selection (0 for RS-232, 1 for Bubble Memory). 5110: Device type (usually set to 3). 5111: Stop bits (typically 2). 5112: Baud rate (e.g., 10 for 4800, 11 for 9600). Spindle and Tooling
3741–3743: These parameters set the maximum spindle speeds for different gear ranges. According to CNCMakers, you can modify these directly to limit RPM.
6700–6710: Used for part counting. Setting 6700#0 to 0 enables counting on M30/M02, as detailed by FactoryWiz. Diagnostic Monitoring
If the machine errors out, check the Diagnostics screen (DGN):
DGN 720: Indicates an overload (OVL) alarm. KFASLLC explains this often points to thermal issues or broken cables. Important Note on Backups
The Fanuc 11M uses a battery to maintain these parameters. If the battery dies while the power is off, all parameters are lost. It is highly recommended to print a hard copy of your specific machine's parameter list or save it to a PC via RS-232.
Are you trying to fix a specific alarm or set up a new communication link? The Ultimate Guide to the Fanuc 11M Parameter
control system uses a vast array of parameters to define machine behavior, hardware configurations, and optional software features. Because these controls are vintage (often dating to the mid-1980s), it is critical to back up all data
—including NC parameters, PMC parameters, and 9000-series programs—before making any changes, as Fanuc may no longer provide data for specific machines. Core Configuration Parameters
These parameters are essential for basic machine operation and communication setup. Parameter 8000 (PWE)
: The most critical setting for modifications. It must be set to
to enable "Parameter Write Enable." Enabling this will trigger a P/S100 alarm , which is normal and clears once PWE is set back to Parameter 5110 (Device Type) : Defines the communication interface (e.g., for standard reader/puncher devices). Parameter 5111 (Stop Bits)
: Sets the number of stop bits for serial communication (must match your PC settings). Parameter 3204 (Program Unlock) : Used to unlock 8000 and 9000-series programs for editing. Common Functional Parameters Parameter No. Description Key Functions Overtravel Limits Controls soft limits to prevent machine crashes. Position Error
Sets the allowable error when the machine is stopped; exceeding this triggers a servo alarm. Calculator Type
Determines if the control interprets values as decimals or integers. Default G-Codes End of Reference Sheet – Print this and
Defines which G-codes (like G54 or G90) are active at power-on. Reset Behavior Controls whether geometry data is retained after a reset. Option Bits
Used to toggle paid options like helical interpolation (e.g., bit 2 in 9100). How to Change Parameters Set the machine to Emergency Stop Parameter 8000 (PWE) and change it to key, then the soft key to enter the main parameter list. Type the parameter number and press (Input Number) to find it. Enter the new value and press : Set PWE back to and cycle power if required by the control. MRO Electric Reference Resources
For detailed lists and technical support, refer to the following sources:
Note: The FANUC 11M is an older CNC control. Parameters vary by machine tool builder (e.g., Mori Seiki, Mazak, Kitamura). Always refer to your machine’s original parameter manual or backup before making changes.
(These examples are illustrative—match to your control’s exact P-numbers.)
Setting axis pulses-per-mm:
Soft limit setup:
Home (datum) offset:
Servo gain selection:
Spindle encoder scaling: