What causes FANUC alarm 223?

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 223?

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 223. 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 223

Fanuc 223 - Servo off during synchronous control

Alarm 223 occurs when the servo system is turned off (via emergency stop, servo off switch, or power interruption) while synchronous control operations are active. Synchronous control requires continuous servo power to maintain coordinated motion between multiple axes or spindles, and any interruption triggers this protective alarm to prevent system damage or loss of synchronization.

FANUCProgram/G-codeIntermediate5-30 minutes

223

Fanuc 223 - Servo off during synchronous control

SERVO OFF DURING SYNCHRONOUS CONTROL

Root Cause Summary

Alarm 223 occurs when the servo system is turned off (via emergency stop, servo off switch, or power interruption) while synchronous control operations are active. Synchronous control requires continuous servo power to maintain coordinated motion between multiple axes or spindles, and any interruption triggers this protective alarm to prevent system damage or loss of synchronization.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Check if E-stop was pressed or servo off switch was activated. Reset E-stop and ensure all safety circuits are closed.
2
Review the part program to identify synchronous control commands (G51.2 for spindle sync, G52 for tandem axes, or machine-specific sync functions). Note the active mode when alarm occurred.
3
Clear the alarm and perform a controlled restart. If sync operation was interrupted mid-cycle, manually jog axes to safe position before attempting automatic operation.
Do not resume synchronous operations until all axes are properly homed and position verified
4
Verify synchronization by running the program in single block mode through the sync activation sequence. Monitor servo ready signals and sync status on the diagnostics screen.

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