251
Invalid Input Data 2
Fanuc · Alpha i series AC Servo Motor
What does 251 mean?
Input data 2 specified with a function code is invalid. This indicates an issue with the format or value of the second input data.
Common Causes
- Invalid input data 2 specified via a function code.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check the input data 2 value specified with a function code.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i series AC Servo Motor