What does the red LED light on the left hand side of display on ATV21 and ATV212 Drive mean?

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What is the red LED light located to the left of the display on ATV21 and ATV212 drives?

Issue:
Red LED light meaning on ATV212 Drive

Product Line:
Altivar 21, Altivar 212

Environment:
All

Cause:
N/A

Resolution:
Bus LED