What causes FANUC alarm 196?

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 196?

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 196. 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 196

Fanuc 196 - Contour control data error

Alarm 196 occurs when the contour control (smooth AI or AI contour control) detects invalid programming data or incompatible move commands. This typically happens when G05.1 Q1 (AI contour control) or G08 P1 (smooth AI) is active and encounters arc commands, illegal axis combinations, or tolerance values outside acceptable limits.

FANUCProgram/G-codeIntermediate5-30 minutes

196

Fanuc 196 - Contour control data error

CONTOUR CONTROL DATA ERROR

Root Cause Summary

Alarm 196 occurs when the contour control (smooth AI or AI contour control) detects invalid programming data or incompatible move commands. This typically happens when G05.1 Q1 (AI contour control) or G08 P1 (smooth AI) is active and encounters arc commands, illegal axis combinations, or tolerance values outside acceptable limits.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Review the active program and locate the block number where alarm 196 occurred.
2
Search backwards from the alarm point to find G05.1 Q1 activation and verify if any G02 or G03 arc commands exist between activation and the alarm.
3
Remove arc commands or convert them to linear G01 moves with small segmentation, or deactivate contour control (G05.1 Q0) before arc blocks and reactivate afterward.
4
Reset the alarm, restart the program from a safe position, and verify smooth execution through the corrected section.
Ensure work offset and tool position are correct before restarting

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