What causes FANUC alarm 015?

Part program contains an illegal or malformed command related to the alarm condition. Missing required address word or parameter value in the program block. Programmed value is out of the allowable range. Conflict between active modal codes and the commanded function. Post-processor configuration mismatch for this Fanuc series.

How do I fix FANUC alarm 015?

1. Note the block number shown in the alarm screen and locate that block in the program. 2. Review the command in that block against the Fanuc programming manual. 3. Check for missing words, incorrect values, or conflicting G-code combinations. 4. Verify the program is post-processed for the correct Fanuc series. 5. Correct the program and dry-run at low speed before resuming machining.

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FANUC Controller

Program/G-code · Basic · 5-10 minutes

Alarm 015

Fanuc Alarm 015 - Excessive Same Address Commands

Fanuc Alarm 015 occurs when a single NC program block contains the same address code (G, X, Y, Z, M, etc.) specified more than once. The control detects duplicate address codes during block parsing and rejects the command to prevent execution ambiguity. This is a programming syntax error that must be corrected in the part program before execution can continue.

FANUCProgram/G-codeBasic5-10 minutes

015

Fanuc Alarm 015 - Excessive Same Address Commands

Too Many Address Commands

Root Cause Summary

Fanuc Alarm 015 occurs when a single NC program block contains the same address code (G, X, Y, Z, M, etc.) specified more than once. The control detects duplicate address codes during block parsing and rejects the command to prevent execution ambiguity. This is a programming syntax error that must be corrected in the part program before execution can continue.

Safety

Command ambiguous

Causes and Fixes

1
Press RESET to clear the alarm. Note the block number (N-number) displayed on the alarm screen where the error occurred.
2
Navigate to EDIT mode, search for the offending block number using the SEARCH function. Examine the block for duplicate axis addresses (X, Y, Z, etc.).
3
Remove the duplicate address, keeping only the intended final position. If both values are needed, split into two separate blocks with appropriate intermediate positions.
4
Save the corrected program and execute from the beginning of the operation or from a safe restart point using block search.
Verify tool position and work offsets before restarting to prevent collision.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter #1020 or #1022 modifications needed
·Servo configuration changes required
·Custom macro programming beyond operator skill level

Prevention

Always verify axis count before programming complex multi-axis movements
Use CAM post-processor settings that respect machine axis limitations
Implement program validation routines for multi-axis operations

Common Mistakes

Copying programs between machines with different axis configurations
Ignoring post-processor axis limitation settings
Manually editing programs without considering interpolation limits

Related Alarms

010 011 020 021

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