What does a flashing green run light indicate on the M340 processor?

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Issue:
The program in my M340 is not running and the RUN light on the M340 CPU is flashing. What does a flashing green run light indicate on the M340 processor?

Product Line:
M340
M580

Environment:
EcoStruxure Control Expert
Unity Pro

Resolution:
The flashing green run light indicates that the PLC is stopped or it is in halt due to a software error.(%SW125).