What causes FANUC alarm 076?

Subprogram number in M98 Pxxxx does not match any program stored in CNC memory. Program stored on external device (USB, DNC) but the device is not active or connected. Program number typo in the M98 call — check for leading zeros (O0123 vs O123). Program was deleted or overwritten since the main program was created. Wrong memory area selected (common programs vs. individual path programs on multi-path controls).

How do I fix FANUC alarm 076?

1. Note the program number referenced in the M98 P call (or macro call). 2. Check the CNC program directory to verify the subprogram exists with the exact number. 3. If using external DNC or USB, verify the device is connected and the program is accessible. 4. Check for leading zero differences — O100 and O0100 may be treated differently depending on parameters. 5. If the program was recently moved or renamed, update the M98 call to match.

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FANUC Controller

Program/G-code · Basic · 5-10 minutes

Alarm 076

Fanuc Alarm 076 - PROGRAM NOT FOUND

Fanuc Alarm 076 occurs when a parameter requiring a power cycle to take effect has been modified. This is a system notification rather than a fault, indicating that certain parameters are stored in non-volatile memory and only loaded during the boot sequence. The alarm will clear automatically once the CNC control is powered off and restarted.

FANUCProgram/G-codeBasic5-10 minutes

076

Fanuc Alarm 076 - PROGRAM NOT FOUND

PROGRAM NOT FOUND

Root Cause Summary

Fanuc Alarm 076 occurs when a parameter requiring a power cycle to take effect has been modified. This is a system notification rather than a fault, indicating that certain parameters are stored in non-volatile memory and only loaded during the boot sequence. The alarm will clear automatically once the CNC control is powered off and restarted.

Safety

Parameter will not take effect until restart

Causes and Fixes

1
Press SYSTEM key, navigate to PARAM screen and verify which parameter was recently modified. Note the parameter number for reference.
2
Document the parameter change if this is a critical system modification. Common parameters requiring power cycle include 1020 (axis configuration), 1815 (servo parameters), 1000-series (basic system parameters), and I/O Link configuration parameters.
Ensure all active machining operations are complete and workpiece is secured before proceeding with power cycle.
3
Place machine in safe condition: Return all axes to home position, stop spindle, clear any active programs, and ensure no emergency conditions exist.
4
Turn off the main control power using the circuit breaker or main power switch. Wait minimum 10 seconds for capacitors to fully discharge, then power on the control. Alarm 076 will clear and parameter changes will take effect.
Never use EMERGENCY STOP button as a substitute for proper power cycle. Complete power down is required for parameter initialization.

DIY Feasiblehigh confidence

Call a technician if:

·Parameter corruption suspected
·Hardware failure of storage devices
·Persistent alarm after verifying all programs exist

Prevention

Maintain organized program numbering system
Keep backup copies of all subprograms
Document M98 call relationships
Regularly verify external storage device functionality

Common Mistakes

Assuming O1 and O0001 are equivalent
Forgetting to set external device parameters
Not checking case sensitivity on program names
Overlooking nested subprogram calls

Related Alarms

078 082 085

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