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Keep a master copy of the source code (with comments!) in a secure, non-passworded offline location.
To avoid the issues associated with forgotten passwords, follow these best practices for PLC HMI password management: all plc hmi password key free download
If a cracking tool sends a malformed packet or attempts to write to the wrong memory address, you risk "bricking" the PLC. Replacing a bricked CPU is far more expensive than hiring a professional to unlock it. Keep a master copy of the source code (with comments
To avoid this situation again, implement a robust : implement a robust :