For new installations, we recommend you install the memory backup battery in the power supply
before installing the power supply in the CPU baseplate.
Replacing the Battery in Existing Installations
The battery can be replaced, if caution is used, while power is applied to the PLC (IMPORTANT:
Read the Warning below).
Lethal voltages may be present in the equipment enclosure. Work performed on
the PLC with power applied must be done
by qualified, trained electrical
who know and follow applicable electrical safety standards and
practices. Failure to heed this warning could result in personal injury or death.
If the Low Battery Warning light (the BATT LED on the power supply) comes on,
replace the battery in the power supply before removing power from the PLC.
Otherwise, there is a possibility that data in RAM memory will be corrupted or
the application program will be cleared from RAM memory
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