This is a last-resort method and requires finding the exact image file for your specific card size (e.g., 64KB, 128KB, 512KB). 4. Win32 Disk Imager
The most critical rule is: on a SIMATIC MMC.
The you are using (e.g., S7-300, S7-1200, S7-1500). If the card is currently unreadable or "defective." If you have a Siemens USB Prommer or a Field PG. siemens mmc card format tool
Simatic MMC (Memory Card) cards are robust, but they can become corrupted due to power loss, improper removal, or electrostatic discharge. When this happens, the PLC CPU will usually not boot up, and the Run/Stop LEDs will indicate a fault. If Windows cannot read the card or prompts you to format it (but fails), you need the specialized Siemens Formatting Tool.
In or TIA Portal , go to the "Online & Diagnostics" view. Select the memory card drive. Choose the option "Format Memory Card." This is a last-resort method and requires finding
Summary
Turn the mode switch to and hold it there for roughly 9 seconds until the STOP LED lights up continuously. The you are using (e
If you insert a Siemens MMC into a standard Windows PC card reader and click "Format," Windows will overwrite this custom structure with a standard FAT or FAT32 file system. This completely strips out the hidden hidden structural headers, making the card and unrecognized by a SIMATIC S7-300 or S7-400 CPU.
The MMC contains an incompatible configuration or has suffered data corruption during a transfer. Step-by-Step Hardware Format: Turn the PLC mode switch to the position.
: Hold the CPU selector switch in the MRES position until the STOP LED stays lit (approx. 9 seconds).