What causes FANUC alarm 049?

Part program contains an illegal G-code or M-code combination for this alarm type. Missing or incorrect address word in the program block. Axis or parameter value out of range for the commanded function. Required option not enabled on this CNC for the commanded function. Conflict between active modal states and the commanded function.

How do I fix FANUC alarm 049?

1. Note the block number shown on the alarm screen and locate that block in the program. 2. Review the command in that block against the Fanuc programming manual for alarm 49. 3. Check for missing address words, incorrect values, or conflicting G-code combinations. 4. Verify any required CNC options are enabled if using advanced functions. 5. Correct the program and verify the fix before restarting machining.

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FANUC Controller

Program/G-code · Intermediate · 5-30 minutes

Alarm 049

Fanuc 49 - Reference return point error

Alarm 049 occurs when the CNC attempts to execute a program requiring machine reference point data, but one or more axes have not completed their reference return (homing) sequence. This alarm can also trigger if the reference position data is lost or corrupted in memory, or if the program calls for an absolute position command before proper homing has been established.

FANUCProgram/G-codeIntermediate5-30 minutes

049

Fanuc 49 - Reference return point error

REFERENCE RETURN POINT ERROR

Root Cause Summary

Alarm 049 occurs when the CNC attempts to execute a program requiring machine reference point data, but one or more axes have not completed their reference return (homing) sequence. This alarm can also trigger if the reference position data is lost or corrupted in memory, or if the program calls for an absolute position command before proper homing has been established.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Check the position display screen for asterisks (*) next to axis position values, which indicate that axis has not been homed.
2
Switch the machine to MANUAL or JOG mode and perform reference return (home) operation for all axes showing asterisks.
Ensure machine area is clear and all safety guards are in place before moving axes.
3
Verify all axis position displays no longer show asterisks and display valid reference positions.
4
Reset the alarm and attempt to run the program again in AUTO mode.

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