ABB REF 54 Series Operator's Manual page 24

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Operator's Manual
Storage of data in the non-volatile memory is indicated by the text "--Storing--" in
the assisting window. Note that storing can be initiated also e.g. via serial
communication.
The auxiliary power supply may not be switched off during storing; the
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stored data are only preserved in the non-volatile memory provided the
storing was completed successfully.
1MRS 750500-MUM