Siemens Mmc Card Format Tool !!hot!! -
Choose the drive letter corresponding to your USB card reader containing the corrupted MMC.
What or Siemens PG laptop you have available.
Connect the card, find it under "Card Reader/USB Memory" in the project tree, and use the "Format" option provided in the software interface. 3. S7IMGWR / S7IMGREAD (Third-Party Recovery)
If formatting externally (not via a PLC), you must use a Siemens Field PG or a specialized Siemens USB prommer. Standard PC card readers cannot read or write the special Siemens header. 3. Critical Warnings siemens mmc card format tool
Given that a new Siemens MMC card costs between $50 and $200 (depending on size), if the format tool fails twice, it is cheaper to buy a new card than to risk production downtime.
: Safely eject the card, insert it into your S7-300 PLC, and perform a manual CPU memory reset (MRES).
Standard operating systems (Windows, macOS, Linux) do not recognize the internal structure of a Siemens MMC. Choose the drive letter corresponding to your USB
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.
For automation engineers without access to a USB Prommer, third-party software like or S7ImgRD/S7ImgWR allows standard PC card readers to interact with Siemens cards. These tools work by reading and writing raw .img sector backups. How to use it:
Before diving into the specific tool, it is crucial to understand why you cannot use Windows Explorer or SD Formatter on a Siemens MMC. Even with the correct tool
Note: This works for older MMCs (S7-300/400). For newer S7-1200/1500 cards, you can usually format directly in TIA Portal!
The S7ImgRD and S7ImgWR tools, along with various capacity image files, can be found in several places. A popular and reliable source is the Siemens industry support forums and various technical resource repositories. For instance, a resource labeled "西门子S7_MMC存储卡镜像软件官方最新版.rar" contains these utilities along with a full collection of .S7img files for 8MB, 64KB, 128KB, 512KB cards and a useful MMC_faq.txt file for reference. Always ensure you are downloading from a reputable source in the automation community to avoid malware or corrupted image files.
Even with the correct tool, you may encounter errors. Here is how to solve them.