Fault Code: U131
Fault Description: DO Function Assignment Exceeds Limit

Cause and Solution:

• Cause: The assigned DO function number exceeds the allowable range of DO function count.

• Solution:

• 1. Check whether the MCU program has been updated.

• 2. Restore system parameters to initialization (set P02-31=1).

• 3. Power on the drive after resetting parameters.

Note: This fault typically occurs after firmware updates or parameter modifications that conflict with DO configuration limits.