What causes FANUC alarm 030?

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 030?

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 030

Fanuc Alarm 030 - Invalid Tool Offset Number

Alarm 030 occurs when a G-code program specifies a tool offset number (H code or D code) that exceeds the maximum number of offset registers configured in the CNC system parameters. This is typically caused by programming errors, incorrect parameter settings limiting the offset memory range, or attempting to use offset numbers beyond the system's licensed capacity.

FANUCProgram/G-codeBasic5-10 minutes

030

Fanuc Alarm 030 - Invalid Tool Offset Number

Illegal Cutter Offset No

Root Cause Summary

Alarm 030 occurs when a G-code program specifies a tool offset number (H code or D code) that exceeds the maximum number of offset registers configured in the CNC system parameters. This is typically caused by programming errors, incorrect parameter settings limiting the offset memory range, or attempting to use offset numbers beyond the system's licensed capacity.

Safety

Offset not applied

Causes and Fixes

1
Navigate to SYSTEM > PARAM and check parameter 5001 (number of geometry offsets) and parameter 5003 (number of wear offsets). Note the maximum values configured.
2
Review the G-code program at the alarm line and identify the H code (geometry offset) or D code (cutter compensation/wear offset) value being called.
3
Verify the offset number in the program does not exceed the parameter limits. For example, if parameter 5001 is set to 200, H codes must be H0-H200.
4
Either reduce the offset number in the program to within range, or increase parameters 5001/5003 if additional offset memory is available and licensed. Power cycle the control after parameter changes.
Parameter modification requires PWE (Parameter Write Enable) switch. Incorrect parameter settings can affect all tool offset functions.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter changes required beyond operator authority
·Persistent alarm after program corrections
·System configuration modifications needed

Prevention

Validate offset numbers during program creation
Use consistent offset numbering scheme
Initialize macro variables before use
Regular program syntax checking

Common Mistakes

Using H0 or D0 for compensation
Forgetting to initialize macro variables
Exceeding maximum offset range
Using decimal values in offset numbers

Related Alarms

031 032 033 034

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