Remove the Micro SD card and power the PLC back on. The hardware is now unlocked and empty.
S7-200 SMART PLC Password Unlock: Comprehensive Guide to Methods and Solutions
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❌ – Siemens does not provide password recovery. Your options:
No password; all operations permitted.
Maintain a physical and digital master password registry accessible only to authorized maintenance managers.
Open Notepad on your PC, leave the document entirely blank, and save it exactly as RESET.TXT . Remove the Micro SD card and power the PLC back on
If you can still communicate with the PLC, you can use the programming software to wipe the memory. Open Software STEP 7-Micro/WIN SMART Access Clear Menu : Go to the menu and select Select All Blocks