If the CPU allows "No Protection" or you have the "Monitor" password but not the "Full Access" password: Go to . Select Functions > Reset to Factory Settings . Choose Retain/Delete IP Address and execute. Method 2: Recovering Know-How Protection If you have the project file but certain blocks are locked:

Only HMI/SCADA systems can communicate. No code reading or writing is allowed without a password.

If you have lost the password for an S7-1200 CPU, the to unlock the device is by using a Siemens SIMATIC Memory Card (SMC). While the TIA Portal offers a "Reset to factory settings" option under "Online & Diagnostics," this function often still requires the password to execute. Therefore, the memory card becomes the primary tool for recovery.

The Siemens S7-1200 is one of the most popular compact programmable logic controllers (PLCs) in the world, widely used in manufacturing, process automation, and building management systems. Its robust feature set and TIA Portal integration make it a favorite among system integrators and maintenance engineers.

If you have proof of ownership and cannot afford to lose the program, you can contact Siemens Technical Support. They may be able to assist if you provide: The hardware serial number. The original project file (if available).

Restricts communication strictly to Human-Machine Interfaces and SCADA systems. Program reading and writing are blocked.

It is critical to note that there is while keeping the program intact. The unlock procedure will completely erase the existing user program and configuration from the PLC's internal memory. The Unlock Procedure (Transfer Card Method)

It is vital to differentiate between the PLC Access Password and Know-How Protection.