: Allows HMIs to communicate but blocks TIA Portal changes. 4. Know-How Protection
The act of unlocking a PLC is fraught with legal implications. While a maintenance engineer might argue they are recovering their company's asset, the methods used—particularly reverse-engineering the firmware—often violate the software license agreements of the manufacturer. Furthermore, providing unlocking services occupies a grey area in intellectual property law. S7-1200 Password Unlock
Most "crackers" found online are scams or malware. : Allows HMIs to communicate but blocks TIA Portal changes
In some instances, updating the firmware of the PLC can reset the protection levels, depending on the specific firmware version and the security settings configured in TIA Portal. However, modern S7-1200 CPUs (firmware V4 and higher) often allow users to set a "Password Protection" that persists even through a firmware update or a "Reset to Factory Settings" command, specifically to prevent theft of IP. If the "Reset to Factory Settings" protection is enabled, the user cannot wipe the PLC without the password. While a maintenance engineer might argue they are
If you cannot connect via TIA Portal because of the password, you can use a to force a wipe of the internal load memory.
: Use the Siemens Support Industry Portal to find specific firmware-dependent reset steps. 2. Resetting via SIMATIC Memory Card (Hard Reset)
