Keep at least one spare MMC card of each type used in your facility. When a card fails, immediate replacement minimizes downtime while the faulty card undergoes recovery procedures.
Disclaimer: This article is for informational purposes only. Always follow official Siemens documentation and safety guidelines when working with industrial control systems. Third-party tools are used at your own risk. Siemens is a registered trademark of Siemens AG.
Some cheap, generic internal chipsets cannot read the specialized controller architecture of industrial MMCs. siemens mmc image file download
All materials produced by Siemens carry copyright protection. As noted in a Siemens forum discussion, Siemens documentation is copyright protected, and making copies without explicit permission is generally prohibited. This extends to MMC image files, which contain Siemens proprietary formatting and potentially third-party intellectual property.
This usually indicates a size mismatch or data corruption. The destination MMC must have the exact same storage capacity (e.g., 64KB, 128KB, 512KB, 2MB, 4MB, 8MB) as the card the image file was originally pulled from. You cannot reliably flash a 512KB image onto a 64KB card, and flashing a small image onto a larger card often leaves unallocated space that confuses the PLC operating system. Keep at least one spare MMC card of
This procedure writes a previously saved image back to an MMC card.
A Siemens Micro Memory Card (MMC) is a critical component in S7-300 and S7-400 PLC systems. It stores the user program, hardware configurations, and system data. If an MMC fails, becomes corrupted, or needs duplication, having a raw sector-by-sector image file ( .img or .wibu ) is your only insurance against costly factory downtime. Some cheap, generic internal chipsets cannot read the
If Windows prompts you to format the card, click Cancel . Run S7ImgRD.exe as an Administrator. Select the drive letter corresponding to your card reader.
Type a new file name ending in .img in the file destination box.
Q: What is the difference between a Siemens MMC image file and a firmware update? A: A Siemens MMC image file contains the software, configuration data, and other necessary information to update or configure a device, while a firmware update refers specifically to the process of updating the device firmware.