What causes FANUC alarm PS0055?

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 PS0055?

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 PS0055. 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 · 5-10 minutes

Alarm PS0055

Fanuc Alarm PS0055 - Canned Cycle Z Missing

PS0055 alarm occurs when a canned cycle (G73, G74, G76, G81-G89) is executed without specifying the required Z-axis depth parameter. The Fanuc control detects that the Z address is missing in the canned cycle block or has not been previously defined in modal memory. This is a programming syntax error that prevents the control from calculating the drill/tap depth.

FANUCProgram/G-codeBasic5-10 minutes

PS0055

Fanuc Alarm PS0055 - Canned Cycle Z Missing

Missing Z in Drill

Root Cause Summary

PS0055 alarm occurs when a canned cycle (G73, G74, G76, G81-G89) is executed without specifying the required Z-axis depth parameter. The Fanuc control detects that the Z address is missing in the canned cycle block or has not been previously defined in modal memory. This is a programming syntax error that prevents the control from calculating the drill/tap depth.

Safety

Tool will not drill without Z

Causes and Fixes

1
Review the flagged program block in EDIT mode or on the PROGRAM screen. Verify the canned cycle line contains the Z address (e.g., G81 X10. Y10. Z-20. R5. F100.).
2
Check parameter 5101 bit 6 (CYC) to confirm canned cycle operation is enabled. If bit 6=0, canned cycles are disabled and may cause unexpected alarms.
3
Verify parameter 5004 (decimal point programming) matches your program format. If 5004=0 (calculator format), ensure Z value includes decimal point. If 5004=1 (pocket calculator), verify correct scaling.
4
Add the Z-axis depth value to the canned cycle block (e.g., change 'G81 X10. Y10. R5. F100.' to 'G81 X10. Y10. Z-20. R5. F100.') and reset alarm using RESET key.

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