What causes FANUC alarm 071?

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 071?

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 · 5-15 minutes

Alarm 071

Fanuc Alarm 071 - Searched Data Not Found

Fanuc Alarm 071 occurs when the CNC control system cannot locate specified data during a memory search operation. This typically happens when a program attempts to search for a program number, sequence number (N-code), or P-address that does not exist in the current memory or active program. The alarm is triggered by unsuccessful execution of search commands or G-code blocks referencing non-existent data.

FANUCProgram/G-codeBasic5-15 minutes

071

Fanuc Alarm 071 - Searched Data Not Found

Data Not Found

Root Cause Summary

Fanuc Alarm 071 occurs when the CNC control system cannot locate specified data during a memory search operation. This typically happens when a program attempts to search for a program number, sequence number (N-code), or P-address that does not exist in the current memory or active program. The alarm is triggered by unsuccessful execution of search commands or G-code blocks referencing non-existent data.

Safety

Search cannot complete

Causes and Fixes

1
Navigate to EDIT mode and press PROG key. Verify the exact program number being called matches an existing program in memory. Check the calling block syntax (M98 P____ or G65 P____) against available programs.
2
Press SYSTEM > PROGRAM > DIR LIST or use the program directory function to display all programs stored in memory. Confirm the target O-number exists and is not corrupted.
3
If using external device call (parameter 3107 bit 0=1), verify the program exists on the USB/CF card or network drive. Check parameter 3107 (external device setup) and parameters 20-22 (I/O channel settings) are correctly configured.
4
Review parameters 3201-3204 (program number range restrictions) to ensure the called program number is within allowed ranges. Re-register or transfer the missing program from backup media if necessary.
Ensure parameter write enable switch (PWE) is ON if modifying program restrictions or I/O parameters.

DIY Feasiblehigh confidence

Call a technician if:

·Memory hardware failure suspected
·Parameter corruption across multiple settings
·Persistent alarm after all software troubleshooting

Prevention

Maintain organized program numbering system
Regular backup of programs and parameters
Use consistent sequence numbering in programs
Verify program syntax before loading

Common Mistakes

Confusing program numbers with sequence numbers
Not checking for leading zeros in program calls
Forgetting to enable custom macro parameter 6050
Removing storage devices during operation

Related Alarms

070 072 073 078

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