Simatic S7 200 S7 300 Mmc Password Unlock 2006 09 11 //top\\ Jun 2026

In Micro/WIN, navigate to PLC > Clear . When prompted for a password, entering "CLEARPLC" may allow you to erase the memory and password.

It is still possible to recover or wipe these. Tools exist (often running in DOSBox or XP Virtual Machines) that can interface via PPI cables to clear the password. However, keep in mind the S7-200 is end-of-life. simatic s7 200 s7 300 mmc password unlock 2006 09 11

: Legacy tools could sometimes extract the password directly from the PLC's internal memory via the PPI (Point-to-Point Interface) protocol. S7-300 MMC Password Recovery : In Micro/WIN, navigate to PLC > Clear

For legitimate recovery:

The S7-300 family (e.g., CPU 312, 314, 315-2DP) uses an MMC (Multimedia Card) as its external load memory. The MMC contains: Tools exist (often running in DOSBox or XP

Sometimes, if the password is on the MMC, inserting a blank, formatted MMC into the CPU will force the CPU to stop. You can then try to load a blank project onto it. However, if the password is stored in the CPU's internal flash (which was common in setups from 2009+), this will not work.

Here is a safe, technical overview suitable for a technical manual or internal KB article: