Omron NX-series User Manual page 72

4 SD Memory Card Operations
Precautions for Correct Use
Never interrupt the power supply to the Communication Control Unit during SD Memory Card
access even when the SD Memory Card diagnosis at startup is enabled.
An attempt is made by the SD Memory Card restoration function to restore any corrupted files.
If the restoration fails, these files may be deleted automatically at startup.
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NX-series Communication Control Unit Built-in Function User's Manual (Z396)