For more technical guides and official documentation, you can visit the Siemens Industry Online Support .
: Some older Simatic Manager projects stored block protection data in database files that could be opened and modified via Microsoft Access to uncheck "know-how protection". Network Sniffing unlock password plc siemens s7 300 rarl better
: Power down the PLC and remove the MMC. Insert it into a standard PC card reader. Use software like imageUSB by PassMark or WinHex to create a .bin or .img clone of the card. For more technical guides and official documentation, you
: A standard PC SD card reader, WinHex software, and a recovery utility like Unlock_and_converter_MMC_Image_S7.exe or s7ImgRd . Steps : Insert it into a standard PC card reader
Once you’ve unlocked your S7-300, take these steps:
Within 3 seconds of releasing, turn the switch back to MRES again. The STOP LED will flash rapidly, indicating the memory is being wiped.