Why does the DI1 assignment show 'Not assigned' for both DI1 low or DI1 high in IO Map?

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Issue:
DI1 assignment in IO Map saying not assigned for both DI1 low or DI1 high.

Product Line:
ATV600, ATV900

Environment:
All

Cause:
Customer checked DI1 assignment in I/O Map but didn't see DI1 current assignment 'Forward'.

Resolution:
Check menu 5.5 (Command and Reference), and Control Mode to see if it is set to "I/O profile", DI1 assignment only show "Forward" if the control mode is set to "Not Separate" or "Separate".