Outside Index Area

What does 774 mean?

An attempt was made to access a parameter index that falls outside the permissible range for its group. This often happens with array-like parameters where indices are restricted to a specific count (e.g., Motor 1, Motor 2, but attempting to access Motor 3 if only 2 are supported).

• A PLC program is attempting to access an element of an array-like parameter (e.g., P3-01[x]) with an index 'x' that is outside its defined range (e.g., trying to read P3-01[4] when only indices 0-3 exist).
• An HMI or configuration tool is referencing an indexed parameter with an out-of-bounds array index due to incorrect configuration.
• A loop in the application code iterates beyond the maximum allowed index for a specific parameter array.
• The actual size or dimension of the parameter array in the drive's firmware is smaller than what the application expects.

Click steps to track your progress.

1. 1

   1. Consult the drive's parameter manual to determine the valid index range (e.g., 0-3) for the specific array-like parameter (e.g., P3-01).

2. 2

   2. Review the PLC program and adjust the array indexing logic (e.g., ensure loop counters for P3-01[x] stay within 0-3).

3. 3

   3. Verify the HMI tag definition or configuration for the indexed parameter to ensure the index used is within the permissible limits.

4. 4

   4. If the parameter is dynamically sized, check the associated size parameter (e.g., P3-00, Array Size) to confirm the current maximum index.