SC03. Use a Memory Card to Reset a Siemens PLC with Password (S7-1200/S7-1500 CPU)
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Summary
A Siemens PLC can be reset using a memory card if the password is forgotten. By inserting an empty memory card into the controller, the existing program and settings are transferred to the card, effectively wiping the controller clean. Afterward, the original program can be downloaded without needing the password.