Select all three checkboxes (Program Block, Data Block, System Block).
| 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. | s7 200 smart plc password unlock new
If prompted for a password during this specific reset process, use the master override password: . Memory Card Reset (No Software Needed) : Select all three checkboxes (Program Block, Data Block,
: Use a standard Ethernet cable and ensure your PC is on the same subnet (default IP is often 192.168.2.1 ). Open the Software : Launch STEP 7-Micro/WIN SMART . Navigate to PLC Menu : Select the PLC tab and click Clear . | | Project file backup | If you
Older S7-200s (non-SMART) had brute-force vulnerabilities or manufacturer backdoors. The uses a stronger cryptographic hash. The "new" unlocking methods do not rely on guessing a 4-digit PIN; they exploit specific firmware vulnerabilities in the boot process or use service-level access known only to Siemens certified repair centers.
Wait for the LED indicators to signal completion (typically the or MAINT LED will flash), then power off and remove the card. Wipeout Utility :