Siemens does not provide a "backdoor" password. However, they offer two legitimate paths for recovery.
Total protection; no external access or program upload is possible without authentication. Industrial Monitor Direct 2. Official Reset Methods (Destructive) s7-200 smart plc password unlock
The S7-200 SMART offers three tiers of CPU protection (configured in the System Block): Siemens does not provide a "backdoor" password
Create a sealed envelope in the plant manager’s safe containing: s7-200 smart plc password unlock