If you do not have the password and simply need to reuse the PLC with a new program, you can reset the device. This will permanently delete the current program and data on the PLC. Using STEP 7-Micro/WIN SMART:
S7 200 Smart - Forget password - Minimum Privilege - SiePortal s7-200 smart password unlock
When you're locked out of a Siemens S7-200 SMART PLC , the standard way to regain access is by resetting the hardware to its factory defaults. Note that this erases the existing program If you do not have the password and