Click the "Unlock" or "Decrypt" button. The software searches for the hexadecimal offset where the password is stored and clears it or displays it to you. Step 3: Converting to STEP 7 Format

If you work with Siemens S7-300 or S7-400 PLCs, you’ve likely encountered the "MMC Image" file format. These files are raw backups of the Micro Memory Cards used in industrial automation. However, because these images are often password-protected or saved in a proprietary format, they can be difficult to access without the original hardware.

Only unlock programs that you own or have legal permission to modify.

The tool will scan the image for S7-300/400 blocks (OBs, FCs, FBs).

The term refers to specialized utility tools designed to extract data from these images and remove S7 block passwords. Here is everything you need to know about managing these files. What is an S7 MMC Image?

In STEP 7, you can go to File > Memory Card File > Open to view the recovered blocks. Risks and Ethical Considerations

The PLC is dead, and you only have an image file of the MMC. You need to convert that image into a readable format to upload it to a new PLC.

To actually use the logic, you may need to convert the raw image data back into a .WLD (Memory Card File) or directly into a STEP 7 project.

Siemens S7 PLCs use MMCs to store the user program (blocks), hardware configuration, and data. When you use a tool like "S7ImgRead" or a standard SD card reader to create a backup, it generates an .img or .wld file.