: Power on the PLC again. It is now in its factory default state and unlocked, allowing you to download a new program. Summary Table: Password Recovery Requirements SIMATIC Memory Card Complete Wipe / Factory Reset Official Siemens Memory Card TIA Portal Reset Reset Protection (if not yet loaded) Original TIA Portal project file "Clear PLC" (S7-200 only) Memory Clear Standard for S7-200 series only Reset to factory settings - remove password - SiePortal
To avoid the need for a password unlock in the future, implement the following best practices: s71200 password unlock work
If none of the above methods work, you can contact Siemens support for assistance. : Power on the PLC again