If you are a system integrator or maintenance engineer, the correct procedure for a "locked" PLC is to contact the original equipment manufacturer (OEM) or the automation engineer responsible for the line to request the credentials or the original project source.
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: In the STEP 7 software, select PLC > Diagnostics/Setting > Clear/Reset and confirm the dialog. If you are a system integrator or maintenance
Unlike a standard Windows PC where password hashes might be extracted or reset, industrial PLCs are designed for reliability and security. unlock s7300 plc password work