What causes FANUC alarm 005?

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 005?

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 005

Fanuc Alarm 005 - Missing Data After Address

Fanuc Alarm 005 occurs when the CNC control reads an address letter (G, X, Y, Z, F, S, T, M, etc.) in a program block that is not followed by the required numeric value. This is a program syntax error that prevents the control from interpreting the commanded operation. The alarm is triggered during program verification, MDI input, or execution when the parser encounters an incomplete address command.

FANUCProgram/G-codeBasic5-10 minutes

005

Fanuc Alarm 005 - Missing Data After Address

No Data After Address

Root Cause Summary

Fanuc Alarm 005 occurs when the CNC control reads an address letter (G, X, Y, Z, F, S, T, M, etc.) in a program block that is not followed by the required numeric value. This is a program syntax error that prevents the control from interpreting the commanded operation. The alarm is triggered during program verification, MDI input, or execution when the parser encounters an incomplete address command.

Safety

Command incomplete

Causes and Fixes

1
Press RESET to clear the alarm. Note the program block number (N-number or line number) displayed with the alarm on the ALARM screen.
2
Navigate to EDIT mode, search for the flagged block number using the search function, and examine each address letter in that block to identify which letter lacks numeric data.
3
Correct the program by adding the missing numeric value after the address letter (e.g., change 'G X50.0' to 'G01 X50.0' or 'M' to 'M30'). Verify proper spacing between addresses.
4
Perform program check by switching to MEM mode, set parameter 3107#0 (Program Check Mode) to 1 via SYSTEM > PARAM, then execute a dry run to verify no syntax errors remain. Return parameter 3107#0 to 0 after verification.

DIY Feasiblehigh confidence

Call a technician if:

·Program corruption persists after multiple transfer attempts
·Parameter modification required beyond operator access level

Prevention

Always validate program syntax before loading
Use consistent CAM post-processor settings
Implement program backup procedures
Train operators on proper program editing techniques

Common Mistakes

Assuming alarm is hardware-related instead of program syntax
Editing programs without understanding FANUC address-value pair requirements
Not using program check mode before execution
Ignoring communication parameter settings during program transfer

Related Alarms

006 007 010 020

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