What causes FANUC alarm 117?

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 117?

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 117. 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 117

Fanuc 117 - Cannot command g37 in current mode

Alarm 117 occurs when G37 (automatic tool length measurement) is commanded in an incompatible machine mode or state. The control cannot execute G37 because prerequisites are not met, such as being in an incorrect operating mode, having conflicting modal G-codes active, or missing required setup parameters.

FANUCProgram/G-codeIntermediate5-30 minutes

117

Fanuc 117 - Cannot command g37 in current mode

CANNOT COMMAND G37 IN CURRENT MODE

Root Cause Summary

Alarm 117 occurs when G37 (automatic tool length measurement) is commanded in an incompatible machine mode or state. The control cannot execute G37 because prerequisites are not met, such as being in an incorrect operating mode, having conflicting modal G-codes active, or missing required setup parameters.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Check the current machine operating mode on the control panel. Verify you are in MEMORY or AUTO mode, not EDIT or MANUAL.
2
If in EDIT mode, switch to MEMORY mode before executing the program containing G37.
3
Review parameter 6254 (G37 skip signal assignment) to ensure tool measurement hardware is properly configured.
Do not modify parameters without backing up current settings and understanding system configuration.
4
Test G37 command in MDI mode with a simple block (e.g., G37 Z-100. F100) to verify mode compatibility.
Ensure tool measurement probe is installed and Z-axis has clear travel path before testing.

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