The top green LED, labeled PWR, provides an indication of the operating state of the
power supply. The LED is ON when the power supply has a correct source of power and
is operating properly, and OFF when a power supply fault occurs or power is not applied.
The second green LED, labeled OK, is steady ON if the PLC is operating properly, and
OFF if a problem is detected by the PLC.
The third green LED, labeled RUN, is steady ON when the PLC is in the RUN mode.
The bottom red LED, labeled BATT, will be ON if the memory backup battery voltage is
too low to maintain the memory under a loss of power condition; otherwise it remains
OFF. If this LED is ON, the Lithium battery must be replaced before removing power
from the rack, or PLC memory may be lost.
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