If you still have some level of online access (e.g., via "Accessible Devices"), you can try a software-based reset. Access Tools : Open TIA Portal and go to Online & Diagnostics Locate PLC : Use the "Accessible devices" search to find your CPU. : Navigate to Functions > Reset to factory settings Clear Security : Ensure you select the option "Delete password for protection of PLC configuration data" before clicking Reset. sieportal.siemens.com Important Considerations
This is the standard procedure when you cannot access the PLC via TIA Portal because of a forgotten password. "https://docs.tia.siemens.cloud". Requirements: You need an official Siemens SIMATIC Memory Card
Best practices for administrators
Be wary of software claiming to "crack" Siemens passwords. These are often unreliable or contain malware. Reset to factory settings - remove password - SiePortal
A PC equipped with an SD card reader and Siemens TIA Portal installed. Step-by-Step Procedure s71200 password unlock top
: Insert the memory card into a PC with a card reader and ensure it is empty. You can also format it via the Siemens TIA Portal under "Card Reader".
Completely shut off the 24VDC or 120/230VAC power supply running to your S7-1200 CPU. If you still have some level of online access (e
Do you have the original saved on your computer?
Various commercial tools claim to unlock S7-1200 passwords through methods including: sieportal
Insert the card into the PLC and turn the power back on.