Official methods for password recovery on Siemens S7 PLCs generally involve or using a blank Siemens memory card to wipe the internal load memory, which inherently deletes the existing program and password. Tools like the one you mentioned are often found on unverified file-sharing sites and carry significant risks. Review of Password Recovery Methods Description Risk Level Reliability Official Reset Using an empty Siemens SIMATIC memory card to wipe the CPU. Low High (Program is lost) Default Passwords Checking common defaults like basisk or admin . Low Low (Usually changed) Third-Party Tools Software like "keys7-v314" aimed at extracting passwords. High Variable / Unsafe Key Considerations
RE: S7-300 PLC Password forgot problem. - SiePortal - Siemens password-find-plc siemens s7-keys7-v314-
Some tools (like by Scadascore or Siemens S7 Password Finder 2018 ) send repeated login attempts over the S7comm protocol (port 102). However: Official methods for password recovery on Siemens S7
Locks individual code blocks (FCs, FBs) so users cannot view the underlying ladder or structured text logic. Low High (Program is lost) Default Passwords Checking
If the utility misinterprets the memory, it could crash the CPU, leading to total memory loss.