Use image creation software (like HDD Raw Copy) to read the raw data from the Siemens MMC to a file on your PC. Method 3: Extract from Existing Backups
These files are primarily used to restore corrupted cards or to "flash" a working program onto a new card without needing the original source code.
This guide outlines the methods for handling, backing up, and restoring Siemens Micro Memory Card (MMC) image files, specifically for S7-300 and S7-400 PLCs. Siemens S7-300
Downloading the correct Siemens MMC image file is crucial to ensure the proper functioning of the device. Using an incorrect or outdated image file can lead to: siemens mmc image file download
For full bit-by-bit copy (including password hash and bad blocks):
: Never format the MMC when Windows prompts you to. This destroys the proprietary Siemens internal structure.
: A community-created utility specifically for writing .S7img files. Hardware : A standard USB card reader is usually required. Use image creation software (like HDD Raw Copy)
: A professional hex editor used to clone raw images back to physical media.
Safely remove the hardware media via the Windows system tray before pulling the card. Step-by-Step Guide: Writing an Image File to a New MMC
Using a standard external card reader to access a Siemens MMC can corrupt the card permanently. Siemens official documentation warns against reading MMC cards with normal card readers. The only "official" way to read and write S7-300 MMCs is to use a Siemens USB Prommer or a Siemens Field PG, which has the prommer built in. Siemens S7-300 Downloading the correct Siemens MMC image
If WinHex cannot write the image, your card's flash memory may be physically damaged. The image file can only fix logical, file-system-level corruption. Where can I download the S7imgWR tool?
These images are typically written back to a physical Siemens MMC using specialized hardware, such as a SIMATIC Prommer . How to Obtain Siemens MMC Image Files