: Complete lockout. You cannot upload the program from the PLC even with a password. In this case, you must have the original project file on your PC to make changes. 4. Bypassing Block-Level Protection
For newer S7-200 SMART models, you can perform a factory reset without software using a standard MicroSD card.
: In the STEP 7-Micro/WIN SMART software, if you are prompted for a password when trying to clear the PLC, use the universal reset string: CLEARPLC . Procedure : Connect your PC to the PLC via Ethernet. Open STEP 7-Micro/WIN SMART . Navigate to the PLC menu and select Clear . s7 200 smart plc password unlock new
When the password dialog appears, enter . This will wipe the memory and remove the hardware password. 2. MicroSD Card Factory Reset (Newer Models)
The PLC will reset to its default IP and clear all protection levels. 3. Understanding Protection Levels : Complete lockout
Select all three checkboxes (Program Block, Data Block, System Block).
If you do not need the existing program and simply want to reuse the hardware, resetting the device is the most reliable approach. Procedure : Connect your PC to the PLC via Ethernet
Navigating a forgotten password on a Siemens S7-200 SMART PLC