What causes FANUC alarm 072?

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 072?

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 072

Fanuc Alarm 072 - Program Directory Full

FANUC Alarm 072 occurs when the CNC memory has reached the maximum number of program registrations allowed by the system configuration. This limit is controlled by parameter settings that define the maximum number of programs (not memory capacity) that can be stored in the program directory. The alarm prevents new program registration until existing programs are deleted or the parameter limit is increased.

FANUCProgram/G-codeBasic10-20 minutes

072

Fanuc Alarm 072 - Program Directory Full

Too Many Programs

Root Cause Summary

FANUC Alarm 072 occurs when the CNC memory has reached the maximum number of program registrations allowed by the system configuration. This limit is controlled by parameter settings that define the maximum number of programs (not memory capacity) that can be stored in the program directory. The alarm prevents new program registration until existing programs are deleted or the parameter limit is increased.

Safety

New program cannot be stored

Causes and Fixes

1
Press SYSTEM > PARAM and check Parameter 3107 (maximum number of programs). Note the current value (typical range: 40-400 depending on system configuration).
2
Press PROG key and view the program directory list. Count the total number of registered O-numbers or check the program count display at the bottom of the directory screen.
3
Delete unused or obsolete programs: Select program, press DELETE key, confirm deletion. Repeat until sufficient entries are freed.
Verify programs are backed up before deletion. Some programs may be protected by parameter 3202 bit settings.
4
If all programs are needed, increase Parameter 3107 value (requires parameter write enable via parameter 0000 bit 0 = 1). Verify available memory capacity using SYSTEM > CURRENT screen to ensure sufficient flash/SRAM.
Setting parameter write enable disables write protection. Return bit to 0 after modification. Power cycle required after parameter change.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter corruption suspected
·Memory hardware failure indicated
·System won't accept program deletion

Prevention

Implement regular program housekeeping schedule
Use external program storage for archive
Monitor program count monthly
Establish naming conventions for easy identification

Common Mistakes

Deleting active production programs
Not backing up before mass deletion
Ignoring macro program accumulation
Assuming all O-numbers are necessary

Related Alarms

070 071 073 074

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