depends on whether you need to to keep the existing program or reset the device to start fresh. 1. Resetting the PLC (Deletes Program)
The “exclusive unlock” became a cautionary tale taught in industrial cybersecurity courses: Just because you can bypass a lock doesn’t mean you understand what the lock was protecting. siemens s7 300 password unlock exclusive
: Regain access to read/write functions and stop/start controls even if the system is fully locked. depends on whether you need to to keep
. The STOP LED will flash rapidly to indicate the reset is complete. : Regain access to read/write functions and stop/start
Before proceeding, it's important to clarify:
If you do not have the password and need to regain access to the PLC hardware (at the cost of the existing program), you can perform a factory reset. Set the CPU switch to STOP .