The PLC is now in its factory state (or "unlocked") and ready for a new project download. 2. Factory Reset via TIA Portal (Requires Online Access)
Some OEMs save the program to an external memory card. If the CPU is set to run from card, removing the card and power-cycling may revert to a temporary factory state. Not common, but worth 5 minutes. S7-1200 Password Unlock
Elias didn't look up. He adjusted his glasses, the glare from his laptop screen reflecting in the lenses. "It’s not just a 'bypass,' Sarah. Someone set a read/write password on this block years ago. The guy who wrote the logic is long gone, and he didn't leave the keys." The PLC is now in its factory state
Wait until the blinking stops and the LED stays yellow (STOP mode). Finalize : Power down the CPU again and remove the memory card . If the CPU is set to run from
If you've lost the password for your own equipment:
If the Web Server was enabled during the original configuration: Navigate to the PLC's IP address in a browser. Check the tab.