Siemens Mmc Card Format Tool ~repack~ -
Open the view of your connected CPU in Siemens TIA Portal . Navigate to the Functions folder. Select Format Memory Card and click the Format button. Via SIMATIC Manager (Step 7 Classic) Connect to the PLC online. Go to PLC > Display Accessible Nodes .
| 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 |
Siemens Micro Memory Cards (MMCs) are proprietary storage modules essential for the operation of SIMATIC S7-300, S7-400, and ET200 programmable logic controllers (PLCs). Unlike standard commercial SD or MMC cards, Siemens MMCs utilize a specialized internal file system layer. Formatting these cards using standard Windows tools will corrupt the internal system blocks, rendering the card completely unreadable by a Siemens PLC.
Locate a clean .img backup file that matches your exact MMC part number and storage size (e.g., 64KB, 128KB, 512KB, 2MB, 4MB, 8MB). Automation forums often archive these images. siemens mmc card format tool
There are two primary ways to format or clear a Siemens MMC without damaging its internal structure:
Siemens MMC cards (used primarily for S7-300 CPUs) are physically identical to standard MultiMediaCards, but they are logically formatted with a proprietary Siemens structure. Unlike a standard FAT32 or exFAT drive, the Siemens MMC contains a private CID (Card Identification) and CSD (Card Specific Data) register, which stores critical information such as the OEM/application ID and product name. The CPU verifies and cross-references the information stored in these special sectors.
The safest, official way to format a Siemens MMC is directly through Siemens engineering software using an authorized Siemens hardware interface. Open the view of your connected CPU in Siemens TIA Portal
Standard formatting deletes the Siemens-specific Layer 4 system files and blocks.
Insert the MMC card into the reader slot. Note the drive letter Windows assigns to it (e.g., Drive E:).
Do you have access to a or just a standard PC? Via SIMATIC Manager (Step 7 Classic) Connect to
Insert the working MMC into a standard MMC/SD card reader connected to a Windows PC. Launch S7ImgRD.exe , select the drive letter corresponding to the MMC, and save a complete image file (typically with the extension .S7img or .bin ).
Ultimate Guide to Siemens MMC Card Format Tools: How to Format and Recover SIMATIC Memory Cards
To avoid needing the format tool frequently, follow these industrial best practices.