What causes FANUC alarm 019?

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 019?

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 19. 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 019

Fanuc 19 - Cannot command g37

G37 is the automatic tool length measurement cycle command. This alarm occurs when G37 is programmed without proper prerequisites being met, such as missing parameter settings, incorrect machine configuration, or incompatible modal conditions. The control cannot execute the tool measurement cycle under the current programming or machine state.

FANUCProgram/G-codeIntermediate5-30 minutes

019

Fanuc 19 - Cannot command g37

CANNOT COMMAND G37

Root Cause Summary

G37 is the automatic tool length measurement cycle command. This alarm occurs when G37 is programmed without proper prerequisites being met, such as missing parameter settings, incorrect machine configuration, or incompatible modal conditions. The control cannot execute the tool measurement cycle under the current programming or machine state.

Safety

Verify corrected program or parameters before resuming machining

Causes and Fixes

1
Check parameter 6201 (tool length measurement enable). Bit 0 must be set to 1 to enable G37 function.
Parameter changes require FANUC password and machine restart. Document original values before making changes.
2
Verify parameters 6241-6244 for tool length measurement position coordinates (X, Y, Z reference positions) are properly configured.
3
Confirm parameter 6245 (measurement block height) and 6246 (approach distance) contain valid non-zero values appropriate for your machine setup.
4
Check that your machine has the optional G37 tool measurement cycle enabled in the control software license. Consult machine builder documentation or FANUC if option is missing.

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