Siemens uses four distinct protection levels for the S7-200 SMART. Knowing which one is active helps determine your options: : No password; full access.
If you do not need the existing program and simply want to reuse the hardware, resetting the device is the most reliable approach. s7 200 smart plc password unlock new
Select all three checkboxes (Program Block, Data Block, System Block). Siemens uses four distinct protection levels for the
: Password required for write access; read-only permitted. Level 3 : Password required for both read and write access. Select all three checkboxes (Program Block, Data Block,
: 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
When the password dialog appears, enter . This will wipe the memory and remove the hardware password. 2. MicroSD Card Factory Reset (Newer Models)
For newer S7-200 SMART models, you can perform a factory reset without software using a standard MicroSD card.