There exist third-party tools or hardware-based methods (e.g., using a card reader and direct sector editing, or using older versions of Step 7 with brute-force or backdoor techniques) that claim to reset or remove S7-200/S7-300 MMC passwords. Important warnings:
Prior to roughly 2004-2005, the standard S7-300 CPUs (like the CPU 315-2DP) used . These were robust but required an external programmer to write to them.
: For situations where software communication is blocked, the utility Wipeout.exe (found on the original installation CD) can reset the CPU to factory defaults, including its baud rate and network address. SIMATIC S7-300 simatic s7 200 s7 300 mmc password unlock 2006 09 11
Select all user blocks and click . This removes the locked hardware configuration and password data while keeping the internal card system intact. 3. Clearing S7-200 Passwords via Clear.exe
: The S7-300 stores the project password directly on the MMC. Because the MMC uses a proprietary format (not standard FAT), Windows cannot read it directly, but hex editors can. Historic Method : There exist third-party tools or hardware-based methods (e
Between 2006 and 2009, many hopeful engineers searched for "MMC Password Recovery" software.
Do you have the , or are you working entirely from the hardware? : For situations where software communication is blocked,
The industrial community survives on shared knowledge – just ensure you keep production running legally and safely.
: If a PLC is set to Level 4 protection, it cannot be uploaded even with a password; the only way to gain access is to clear the memory and download a new program. Key Risks and Precautions S7 300 - Reset PLC password - URGENT - PLCTalk.net
The S7-300 shifted away from internal EEPROM toward an external Micro Memory Card (MMC). The MMC holds the entire user project, including System Data Blocks (SDBs) and Organization Blocks (OBs).