(Maintenance) LED should start blinking, indicating a transfer is in progress.
, as there is no official "backdoor" to recover a forgotten password without wiping the device. Methods for Unlocking S7-1200 Requirement Siemens Memory Card A 4MB+ SIMATIC Memory Card (SMC) Wipes memory and resets the password. TIA Portal Online Tools "Online & Diagnostics" access via TIA Portal Resets settings if you have the current password or if no protection is set. SIMATIC Automation Tool Standalone Siemens software Can perform a factory reset without TIA Portal. Review of the Memory Card Method (Most Reliable) s71200 password unlock work
The steps to once the PLC is unlocked. Using TIA Portal to download your new project. Reset to factory settings - remove password - SiePortal TIA Portal Online Tools "Online & Diagnostics" access
Need professional service? Contact Siemens Technical Support with your CPU Serial Number and proof of ownership. Using TIA Portal to download your new project
If you are already online but blocked specifically by "PLC configuration data" protection (a common TIA Portal V17+ feature), you can reset it via the Online & Diagnostics tool under Functions > Reset to factory settings
Technical Report: Siemens S7-1200 Go to product viewer dialog for this item. Password Recovery and CPU Unlocking Unlocking a password-protected Siemens SIMATIC S7-1200 PLC