| Action | Details | |--------|---------| | | Contact Siemens technical support with proof of ownership (serial numbers, project documentation, purchase records). They can guide you through password recovery or reset procedures. | | Project file backup | If you have the original STEP 7‑Micro/WIN SMART project file (.smart), you may be able to recover or remove the password from the project (not from the locked CPU). | | Factory reset | Some S7-200 SMART CPUs allow a factory reset via a memory clear procedure, but this erases the user program and hardware configuration — not a “password unlock” but a full reset. | | Licensed integrator | A Siemens system integrator with proper credentials may assist with authorized reset procedures. |
: By entering "CLEARPLC" when prompted for a password during a "Clear All" operation in Step 7-Micro/WIN SMART , you can reset the CPU to factory defaults. s7 200 smart plc password unlock new