Siemens Micro Memory Cards (MMCs) are specialized storage devices used in SIMATIC S7-300, S7-400, and ET200 PLC systems. Unlike standard commercial SD or MMC cards, Siemens MMCs utilize a proprietary file system.
Similar to the S7IMG tools, this utility can be used to restore a backup image of a Siemens MMC. If you have a fleet of PLCs, it is highly recommended to create a "Golden Image" of a blank, formatted MMC for each size you use. Step-by-Step: How to Recover a "Bricked" MMC
When writing a raw image to a corrupted card, the image file size must match the hardware limit exactly. Writing a 512KB image onto a 128KB physical card will permanently damage the storage sectors.
Handling these cards requires a shift in mindset from "storage media" to "system firmware." By using the official tools—Simatic Manager or SAT—you ensure the file system remains compatible with the S7 platform. siemens mmc card format tool
Disclaimer: These utilities are third-party freeware tools and are not officially supported by Siemens. Requirements:
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The Siemens MMC (Micro Memory Card) format tool isn't a single software package but a specialized recovery process designed to save "bricked" cards. Because Siemens MMCs use a , they are often accidentally ruined when users try to read or format them using standard Windows tools. 1. The Conflict: Siemens vs. Windows Siemens Micro Memory Cards (MMCs) are specialized storage
: Click on the Write function and browse for the clean .img file matching your specific card size.
The CPU will show a slow blinking FRCE or STOP LED (indicating it requests a reset).
High-quality third-party adapters specifically designed for Siemens MMCs. If you have a fleet of PLCs, it
When an official PG isn't available—or when you need to recover a card that was accidentally formatted—the unofficial "Siemens MMC Card Format Tool" becomes invaluable. This is actually a toolset composed of the utilities (for writing) and S7imgRD.exe (for reading), along with a collection of pre-made .S7img image files for various MMC capacities.
Method 1: Using Siemens SIMATIC Step 7 (Manager or TIA Portal)
Click . Once complete, the hidden Siemens structure is restored, and the card can be inserted back into a PLC or Step 7. 2. Win32 Disk Imager or BalenaEtcher
Allows you to insert a working Siemens MMC into a compatible PC reader and extract a perfect raw sector-by-sector binary backup image (.img).