What causes FANUC alarm 275?

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 275?

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 275. 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 275

Fanuc 275 - Rigid tapping data error

Alarm 275 occurs when the rigid tapping cycle (G84 or G74) is programmed with incompatible parameters, missing required data, or when spindle/feed conditions don't match rigid tapping requirements. The control cannot execute the rigid tapping operation because the commanded parameters violate the mathematical or mechanical constraints for synchronized spindle-axis motion.

FANUCProgram/G-codeIntermediate5-30 minutes

275

Fanuc 275 - Rigid tapping data error

RIGID TAPPING DATA ERROR

Root Cause Summary

Alarm 275 occurs when the rigid tapping cycle (G84 or G74) is programmed with incompatible parameters, missing required data, or when spindle/feed conditions don't match rigid tapping requirements. The control cannot execute the rigid tapping operation because the commanded parameters violate the mathematical or mechanical constraints for synchronized spindle-axis motion.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Locate the rigid tapping block (G84 or G74) in the program and identify the S (spindle speed), F (feed rate), and pitch values.
2
Calculate the correct feed rate using formula: F = S × Pitch. For example, if S=1000 RPM and pitch=1.5mm, then F must equal 1500 mm/min.
3
Verify the feed rate in the program matches the calculated value. Correct the F value if it differs.
4
Test the program in single block mode to confirm the alarm clears and tapping executes properly.
Ensure the tap is clear of the workpiece during initial testing

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