The Siemens MMC Card Format Tool is a lightweight, standalone utility provided (unofficially but widely supported) by Siemens to restore MMC cards to a factory-ready state. It is different from the "Transfer" tool inside STEP 7 software.
What if you don't have a card reader? You can format the card while it is inserted in the PLC, provided the CPU is healthy enough to communicate. siemens mmc card format tool
An MMC is not just a storage device; it's the boot device. When you format a card, it is empty. If you plug an empty card into an S7-300 CPU, the CPU has no hardware configuration. It will likely go into STOP mode or report a configuration mismatch. The Siemens MMC Card Format Tool is a
| Card type | Format tool | Works with | |-----------|-------------|-------------| | Old MMC (S7-300/C7) | Siemens MMC Card Format Tool | S7-300, C7, ET200 | | New SMC (S7-1200/1500) | TIA Portal / SMC Utility | S7-1200/1500 | If you can't find the tool on Siemens'
If you can't find the tool on Siemens' website anymore (it's legacy), I can help you locate the exact Siemens support article ID or explain how to recover a corrupted card. Just let me know which PLC series you're using.