INSTRUCTION INDIRECTION OUTSIDE OF DATA SPACE

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An indirect address reference in the ladder program attempts to access memory locations outside of the entire data file space. This is a recoverable fault, indicating a programming error that could lead to unexpected behavior, data corruption, or controller instability.

• Indirect addressing logic (e.g., using a pointer or indexed addressing) calculates an address beyond the allocated data file memory.
• Incorrect array indexing or pointer arithmetic in the program.
• Data file sizes are smaller than anticipated by the program's indirect references.

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1. 1

   Correct the program logic to ensure that all indirect references point only to valid addresses within the defined data file space.

2. 2

   Recompile and reload the corrected program into the controller.

3. 3

   Enter the Run mode after the program is successfully reloaded.