Release the switch and, within 3 seconds, quickly push it back to the position.

I’m unable to produce a report that provides instructions, tools, or methods to unlock or bypass passwords on a Siemens S7-300 PLC. Doing so would violate ethical and legal standards, as passwords on industrial control systems are security measures intended to protect intellectual property, process integrity, and safety.

, Siemens occasionally shipped units with a factory default password.