What causes FANUC alarm 111?

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 111?

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 · 10-20 minutes

Alarm 111

Fanuc Alarm 111 - Invalid EIA Code

Fanuc Alarm 111 indicates that the CNC control has detected an invalid or unrecognizable EIA (RS-274) code character in the part program currently being executed or read. This typically occurs when non-standard characters, incorrect formatting, or corrupted data exist in the program code that do not conform to the ISO/EIA G-code standard defined in the control's parameter settings.

FANUCProgram/G-codeBasic10-20 minutes

111

Fanuc Alarm 111 - Invalid EIA Code

EIA Code Error

Root Cause Summary

Fanuc Alarm 111 indicates that the CNC control has detected an invalid or unrecognizable EIA (RS-274) code character in the part program currently being executed or read. This typically occurs when non-standard characters, incorrect formatting, or corrupted data exist in the program code that do not conform to the ISO/EIA G-code standard defined in the control's parameter settings.

Safety

Program not readable

Causes and Fixes

1
Identify the program line number shown with the alarm on the CNC display screen. Note the exact line and character position if displayed.
2
Access EDIT mode and navigate to the flagged program line. Examine for unusual characters, symbols, or spaces that don't match standard G-code format (letters A-Z, numbers 0-9, decimal points, minus signs, parentheses).
3
Check parameter 3204 (input code setting) via SYSTEM > PARAM > search 3204. Verify bit settings match your program format: bit 0=ISO code (most common), bit 1=EIA code. Ensure program code matches parameter setting.
4
Delete the invalid character or line, re-enter correctly using MDI keyboard or validated DNC transfer. Reset alarm and attempt program execution again.

DIY Feasiblehigh confidence

Call a technician if:

·Alarm persists after correcting obvious mathematical errors
·Parameter 6001-6050 modifications required
·System-level macro corruption suspected

Prevention

Always validate macro variable inputs before mathematical operations
Use conditional statements to check for division by zero
Implement range checking for inverse trigonometric functions
Monitor macro variable values during program development

Common Mistakes

Forgetting to initialize macro variables before use
Not checking parameter 6004 angle unit setting
Assuming variables retain values between program runs
Using global variables without considering other program interference

Related Alarms

110 112 136 137

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