S7-1200 Password Unlock !!exclusive!! (2025)

Before proceeding with the password recovery process, ensure you have the following:

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.

If you do not have the password and cannot obtain it, the most common solution is to perform a on the S7-1200. Note that this deletes the existing program . Turn off the power to the S7-1200 PLC. Switch the PLC to STOP mode. Turn the power back on.

5 to 20 minutes. Failure rate: 40% on later firmware updates (V4.5+ patched many exploits). S7-1200 Password Unlock

Restricts access to individual software blocks (OBs, FCs, FBs). If a block is Know-How protected, you can see that it exists in the project tree, but you cannot open or view the internal ladder logic or structured text without the block-specific password. Method 1: The Standard Reset (Wiping the CPU)

An ounce of prevention is worth a ton of cure. Here is how to avoid ever needing an S7-1200 password unlock again.

Only perform password recovery/unlocking on devices and projects you own or for which you have explicit authorization. Bypassing protections on devices you do not own may be illegal. Before proceeding with the password recovery process, ensure

If you want, I can:

There are generally three approaches to regaining access to a locked S7-1200, ranging from standard procedures to advanced hardware interventions.

The S7-1200 uses "Know-How Protection" (KHP). When enabled, the blocks (OBs, FBs, DBs) are encrypted. Without the password, you cannot view the logic. However, the PLC can still run the program. The unlock process is not about erasing the password (which would brick the safety functionality) but about bypassing the authentication layer to read the memory. Can’t copy the link right now

If you do not have the password and your primary goal is to make the S7-1200 functional again—even if it means losing the existing program—the official Siemens factory reset is the safest approach. This method clears the CPU memory, internal load memory, and all passwords, returning the PLC to its default factory state. Using an Empty Siemens SIMATIC Memory Card (SMC)

If you can still communicate with the PLC (e.g., if only certain blocks are protected but you have enough access to go online), you can use the software tools within Siemens TIA Portal. SIEMENS S7-1200: Unlock PLC with forgotten password

Controls who can read/write data to the physical PLC hardware (described in the table above).

Whether you need to or if a factory wipe is acceptable The version of TIA Portal you are currently using Share public link