If you fit one of those cases, here’s a you could write for an engineering forum or blog:
Unlocking an S7-200 SMART PLC Go to product viewer dialog for this item. s7 200 smart plc password unlock work
Navigate to the PLC menu and select Clear . When prompted for a password, entering "CLEARPLC" (not case-sensitive) will wipe the memory and reset the hardware password. If you fit one of those cases, here’s
Vulnerability Analysis of S7 PLCs - Queen's University Belfast Vulnerability Analysis of S7 PLCs - Queen's University
: For S7-200 SMART models, you can use a specially prepared microSD card. Creating a file named S7_JOB.S7S with the text factory reset
This is the highest security level. It prevents both uploading and downloading without the correct password. Official Methods for Password Recovery and Reset
For most technicians, the safest third-party method is a professional unlock tool. Here is the generic workflow: