What causes FANUC alarm PS044?

Part program contains an illegal or incorrectly formatted command for this alarm type. Missing required address word or parameter value in the program block. Programmed value is outside the allowable range for this function. Conflict between the commanded function and the current modal state. Program post-processor not configured correctly for this Fanuc series.

How do I fix FANUC alarm PS044?

1. Note the block number from the Fanuc alarm screen and locate it in the program. 2. Review the command in that block against the Fanuc programming manual for alarm PS044. 3. Check for missing address words, incorrect values, or conflicting G-code combinations. 4. Verify any required machine options are enabled if using advanced functions. 5. Correct the program and verify before resuming machining.

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FANUC Controller

Program/G-code · Basic · 5-15 minutes

Alarm PS044

Fanuc Alarm PS044 - Reference Return in Fixed Cycle

PS044 alarm occurs when a reference return or positioning command (G27, G28, G29, or G30) is programmed within an active fixed cycle modal group (G73, G74, G76, G80-G89). The CNC cannot execute machine coordinate system positioning commands while a canned drilling/tapping cycle is active, as this creates a modal conflict in the G-code interpreter.

FANUCProgram/G-codeBasic5-15 minutes

PS044

Fanuc Alarm PS044 - Reference Return in Fixed Cycle

G27-G30 NOT ALLOWED IN FIXED CYC

Root Cause Summary

PS044 alarm occurs when a reference return or positioning command (G27, G28, G29, or G30) is programmed within an active fixed cycle modal group (G73, G74, G76, G80-G89). The CNC cannot execute machine coordinate system positioning commands while a canned drilling/tapping cycle is active, as this creates a modal conflict in the G-code interpreter.

Safety

Verify tool position

Causes and Fixes

1
Review program at alarm line. Press RESET, then navigate to EDIT mode and examine the block where PS044 occurred. Look for G28/G30 commands following G73-G89 without intervening G80.
2
Insert G80 (cancel canned cycle) on a separate block before the G27/G28/G29/G30 command. Example: Change 'N100 G83 Z-50. R5. Q5. F100 / N110 G28 Z0' to 'N100 G83 Z-50. R5. Q5. F100 / N105 G80 / N110 G28 Z0'.
3
Verify parameter 3405 bit 0 (G28/G30 behavior) is set correctly. Navigate to SYSTEM > PARAM > search 3405. Bit 0=0 allows intermediate positioning, bit 0=1 is strict mode. Standard setting is bit 0=0.
4
Re-run program in single block mode (press SINGLE BLOCK button) to verify G80 cancellation occurs before reference return commands execute.

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