: Ensure you are using original Siemens parts , as generic SD/MMC cards lack the required internal controller logic.
This method doesn't just wipe data; it prepares the card to accept a System Data Block containing the hardware configuration. This is essential for the CPU to recognize the card upon startup. siemens mmc card format tool
Navigate to and click "Format". Using a SIMATIC Field PG : : Ensure you are using original Siemens parts
: Standard formatting deletes hidden system files. siemens mmc card format tool