What causes FANUC alarm 083?

Machine system or function indicated by the alarm name has detected a fault. Control parameter or configuration error related to the alarm condition. Hardware component fault on the CNC or machine. Part program error or illegal operation for the indicated function. Machine interlock or safety condition not satisfied.

How do I fix FANUC alarm 083?

1. Note the alarm number and check the Fanuc alarm screen for any sub-code or additional details. 2. Identify the specific machine system or function from the alarm name. 3. Power cycle the machine to clear transient faults. 4. Consult the Fanuc parameter or operator manual for alarm 083 specific remedy. 5. Contact Fanuc service if the alarm persists after basic troubleshooting.

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FANUC Controller

Program/G-code · Intermediate · 15-30 minutes

Alarm 083

Fanuc Alarm 083 - ILLEGAL AXIS COMMAND IN G37

Fanuc Alarm 083 occurs when the G37 tool length measurement command contains an improperly specified axis designation or multiple conflicting axes. The G37 cycle requires a single linear axis (typically Z) to be commanded, and errors arise when no axis is specified, multiple axes are commanded simultaneously, or a rotary axis is used instead of a linear axis.

FANUCProgram/G-codeIntermediate15-30 minutes

083

Fanuc Alarm 083 - ILLEGAL AXIS COMMAND IN G37

SYSTEM ALARM 83

Root Cause Summary

Fanuc Alarm 083 occurs when the G37 tool length measurement command contains an improperly specified axis designation or multiple conflicting axes. The G37 cycle requires a single linear axis (typically Z) to be commanded, and errors arise when no axis is specified, multiple axes are commanded simultaneously, or a rotary axis is used instead of a linear axis.

Causes and Fixes

1
Review the G37 program block causing the alarm. Verify that exactly one linear axis is specified, typically Z-axis (e.g., G37 Z-100.0;).
2
Check if multiple axes appear in the same G37 block. If multiple axes need measurement, separate G37 commands must be used on individual lines for each axis.
3
Verify parameter 6241 (G37 Skip Signal) is properly set to designate the skip input signal number (typically 1-8). Check SYSTEM > PARAM > [6241] to confirm configuration matches machine setup.
4
Test with a corrected G37 block using single axis specification: G37 Z-50.0 F100; Ensure feedrate is commanded and axis direction moves toward measurement probe.
Ensure skip signal input (parameter 6241) is wired and functional before executing G37 or machine may crash into fixture.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter changes required beyond operator access level
·Tool measurement option not installed
·Machine axis configuration issues

Prevention

Always verify axis specifications before using G37
Use only configured measurement axes in G37 blocks
Separate positioning moves from tool measurement commands

Common Mistakes

Including X/Y positioning in G37 block
Using rotary axes with G37
Copying G37 blocks between different machine configurations

Related Alarms

010 011 084 085

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