Warning: Do not use a standard SD card; the CPU exclusively supports Siemens-formatted cards.
Keep a dedicated Reset Card in the control cabinet for emergency clearing. 💡 Need a specific walkthrough? Tell me: The Firmware Version (e.g., V4.2) If you have the TIA Portal project file If you have a Siemens Memory Card on hand I can give you the exact steps for your specific setup. S7-1200 Password Unlock
From firmware version 4.0 onward, the S7-1200 implements a security mechanism that is far more robust than its predecessors: Warning: Do not use a standard SD card;
Power the PLC back on. The CPU is now reset to factory defaults with no password protection. Recovery via Firmware Update (Alternative) S7-1200 Password Unlock