S7-1200 Password Unlock 【2027】

Search for "Password.txt" or "ReadMe" files in the original project folder.

Power on the CPU. The CPU will automatically transfer the "empty" state from the card to its internal memory, wiping the protected project and password.

In , go to the "Project tree" and find the "Card Reader/USB memory" folder.

Connect the PG/PC to the PLC and open the view in TIA Portal. Navigate to Functions > Reset to factory settings .

Unlike older S7-300 or S7-200 models, the S7-1200 uses sophisticated encryption.

If a user has the PLC password but the project blocks are locked with Know-How protection, the code can be downloaded to the PLC, but the source code remains unreadable in TIA Portal. There is no backdoor to decrypt Know-How protection; it uses strong encryption. The only technical bypass involves analyzing the compiled code (MC7) inside the PLC memory, but this yields machine code (assembly equivalent), not the original Structured Control Language (SCL) or Ladder Logic (LAD), making reverse engineering exceptionally difficult and costly.