What causes FANUC alarm 022?

G02 or G03 circular interpolation block is missing the R word for radius definition. I, J, or K incremental distance values from start point to arc center were omitted from the arc block. Wrong plane selection means the correct axis offset word is missing, for example using I and J on a G17 plane but the arc is programmed on G18 or G19. A previous block ended mid-arc and the continuation block does not re-specify the arc parameters. Copy-paste or manual editing error removed the R or IJK values from the arc command.

How do I fix FANUC alarm 022?

1. Find the block number in the alarm and open the program to that exact line. Confirm the G02 or G03 block contains either an R value or the correct I, J, K offset values. 2. Check which plane is active at that block. G17 uses I and J, G18 uses I and K, G19 uses J and K. Make sure you are using the right axis letters for the active plane. 3. If using R format, verify the R word is present and has a non-zero value. A missing R or R0 will trigger this alarm. 4. If using IJK format, verify the values represent the incremental distance from the arc start point to the arc center, not the center coordinates themselves. 5. Search the program for any other G02 or G03 blocks that may also be missing arc data, then correct all instances before rerunning. 6. After editing, do a dry run with feed hold and single block active to step through the arc moves and confirm no further alarms appear.

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FANUC Controller

Program/G-code · Basic · 5-15 minutes

Alarm 022

Fanuc Alarm 022 - R OR I,J,K COMMAND NOT FOUND

Fanuc alarm 022 occurs when a G02 or G03 circular interpolation command is issued without the required arc definition parameters. The CNC control requires either R (radius) or I, J, K (incremental center coordinates) to calculate the arc path, and their absence prevents execution of the circular move.

FANUCProgram/G-codeBasic5-15 minutes

022

Fanuc Alarm 022 - R OR I,J,K COMMAND NOT FOUND

FANUC ALARM 22

Root Cause Summary

Fanuc alarm 022 occurs when a G02 or G03 circular interpolation command is issued without the required arc definition parameters. The CNC control requires either R (radius) or I, J, K (incremental center coordinates) to calculate the arc path, and their absence prevents execution of the circular move.

Causes and Fixes

1
Enter EDIT mode and navigate to the program block triggering the alarm. Press SYSTEM > ALARM to view the current block number (N-number) or sequence causing the fault.
2
Examine the G02 or G03 command in the flagged block. Verify presence of either R (radius format) or I, J, K (center format). Example correct formats: G02 X10.0 Y10.0 R5.0 F100 or G02 X10.0 Y10.0 I5.0 J0 F100.
3
If using macro variables (#500-#999 range), verify the variable contains a valid non-zero value. Access CUSTOM screen or use DGNOS > MACRO to view current variable values. Empty or undefined variables will cause parameter omission.
4
Add the missing R value or appropriate I, J, K parameters to the circular interpolation block. For XY plane (G17): use I and J. For ZX plane (G18): use I and K. For YZ plane (G19): use J and K. Reset alarm and restart program.
Ensure the arc endpoint is geometrically valid. Arc radius/center must create a solvable circle segment or alarm 020/021 may follow.

DIY Feasiblehigh confidence

Call a technician if:

·Program structure corruption
·Repeated alarms after parameter correction
·CAM post-processor generating invalid code

Prevention

Always include either R parameter or complete I,J,K coordinates in circular interpolation
Use program verification tools before loading to CNC
Implement program backup procedures
Train operators on proper G02/G03 syntax

Common Mistakes

Mixing R method with I,J,K method in same block
Using incorrect plane selection before circular interpolation
Forgetting to specify arc parameters when copying/modifying existing programs
Incomplete parameter entry during manual programming

Related Alarms

020 021 033 034

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