Navigate to the section in the project tree.
If you need to proceed with recovering your system, let me know: What is currently running on your S7-1200?
Power the PLC back on. The CPU is now reset to factory defaults with no password protection. Recovery via Firmware Update (Alternative)
Switch the PLC to STOP mode. Turn the switch to MRES and hold it until the STOP LED turns solid, then release and turn back to STOP within 3 seconds. The STOP LED will flash.
Siemens S7-1200 Password Unlock: Recovery, Security, and Risk Mitigation S7-1200 Password Unlock
: Restricts all access without a password. Summary of Risks SIMATIC S7 S7-1200 Programmable controller - ID: 91696622
Method B: Factory Reset via TIA Portal (Online & Diagnostics)
Method 1: Factory Reset via TIA Portal (Password Known or Write-Accessible)
: Allows viewing but requires a password to change the program. Navigate to the section in the project tree
Applies specifically to individual software blocks (FCs, FBs, DBs) rather than the whole hardware unit, hiding the underlying code logic from view. Is It Possible to Crack or Bypass an S7-1200 Password?
Users can view the program structure and online diagnostics but cannot modify the logic or download new code.
Store all Master PLC passwords in an encrypted company password vault (such as KeePass or 1Password) managed by the engineering department.
If you have access to old project files or backups ( .ap13 , .ap14 , .ap15 , .ap16 , .ap17 , .ap18 , or .ap19 extensions): The CPU is now reset to factory defaults
Highest security level. The PLC is entirely locked, often preventing even re-initialization (depending on firmware version) or downloading a new project.
: Go to the Online & Diagnostics view for the CPU. Under the Functions folder, select Reset to factory settings .
Anyone can read, write, modify, or delete the PLC program.
This is the most overlooked "solution." The S7-1200 hardware password is stored in the TIA Portal project under .