What causes FANUC alarm PS033?

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 PS033?

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 PS033. 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 · Intermediate · 15-45 minutes

Alarm PS033

Fanuc Alarm PS033 - Cutter Compensation Error

PS033 occurs when the CNC cannot calculate a valid tool path during cutter radius compensation (G41/G42) execution. This typically happens when the programmed geometry creates impossible tool center paths, such as internal corners smaller than the tool radius, consecutive blocks that create interference, or inadequate move distances relative to the compensation value.

FANUCProgram/G-codeIntermediate15-45 minutes

PS033

Fanuc Alarm PS033 - Cutter Compensation Error

NO INTERSECTION AT G41/G42

Root Cause Summary

PS033 occurs when the CNC cannot calculate a valid tool path during cutter radius compensation (G41/G42) execution. This typically happens when the programmed geometry creates impossible tool center paths, such as internal corners smaller than the tool radius, consecutive blocks that create interference, or inadequate move distances relative to the compensation value.

Safety

Verify tool path before running

Causes and Fixes

1
Press OFFSET key and verify the active offset number called by D code in the program. Check the actual radius value in the geometry offset table (not wear offset) to confirm it matches the physical tool radius.
2
Review the programmed path geometry at the alarm location. Measure internal corners, slot widths, and arc radii. Verify all internal features are larger than 2x the tool radius (diameter clearance).
3
If geometry cannot be changed, reduce the offset value in the geometry offset table or use a smaller diameter tool. Re-run program from a safe position before the compensation start block.
4
Check parameter 5004 (C.COMP TYPE) - standard setting is 1. If set to 0 (type A compensation), change to 1 (type C) for better handling of tight corners, then reset and test program.
Changing compensation type may affect all programs using cutter comp. Verify with proven programs first.

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