What causes FANUC alarm PS074?

Attempting to transfer a program from external device when a program with the same number is already stored. MDI program creation using a number that already exists in memory. DNC transfer without overwrite permission enabled on the control. Program number collision when automatically generating program numbers from a macro.

How do I fix FANUC alarm PS074?

1. Check the CNC program directory to confirm the existing program with the same number. 2. Delete the existing program first if the new version should replace it. 3. Rename the new program to a different number if both need to be kept. 4. Enable program overwrite in the CNC operating settings if overwriting is intended.

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FANUC Controller

Program/G-code · Basic · 5 minutes

Alarm PS074

Fanuc Alarm PS074 - Invalid Program Number

PS074 alarm occurs when the operator or program attempts to call, create, or reference a program number outside the valid range defined by parameters 3107/3108, or when using reserved program numbers (O0000, O8000-O8999, O9000-O9999 for macro programs). This is a program selection/management error preventing invalid program number registration or execution.

FANUCProgram/G-codeBasic5 minutes

PS074

Fanuc Alarm PS074 - Invalid Program Number

PROGRAM NUMBER ALREADY IN USE

Root Cause Summary

PS074 alarm occurs when the operator or program attempts to call, create, or reference a program number outside the valid range defined by parameters 3107/3108, or when using reserved program numbers (O0000, O8000-O8999, O9000-O9999 for macro programs). This is a program selection/management error preventing invalid program number registration or execution.

Safety

Some numbers are reserved

Causes and Fixes

1
Navigate to SYSTEM > PARAM and verify parameter 3107 (minimum program number limit) and parameter 3108 (maximum program number limit). Check if the program number in question falls within this range.
2
Check the program number being called from MDI, Edit mode, or via M98/G65 subprogram call. Verify it is between the limits set in parameters 3107 and 3108.
3
If the program number is valid but parameters are too restrictive, modify parameter 3107 or 3108 to expand the valid range. Enable parameter write enable (PWE) switch or set parameter 3202#0=1 to allow parameter modification.
Changing parameter 3107/3108 requires parameter write access and may affect existing program management structure. Document changes.
4
Reset alarm by pressing RESET key after correcting program number or parameters. Re-attempt program call or registration.

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