When a company has lost the original source files for their machines but still possesses the compiled project running on the factory floor.
It removes the "KNOW_HOW_PROTECT" keyword from compiled blocks, allowing users to view the underlying code.
It is important to understand what the S7 Can Opener do: Simatic S7 Can Opener V1.31 33
It is compatible with standard S7 programs ( *.s7p ) and S7 libraries ( *.s7l ).
This utility is most valuable in industrial environments where access to the original developer is no longer possible. Common scenarios include: When a company has lost the original source
For high-level languages like SCL or CFC , the tool provides the unlocked block in plain STL (Statement List) code rather than restoring the original high-level source text.
Users can set or remove protection without needing to recompile the entire block in the STEP 7 environment . This utility is most valuable in industrial environments
If the original compiled block included internal comments, these remain readable after the block is unlocked. Practical Use Cases
It does not decrypt the newer "Block Privacy" protection introduced in STEP 7 V5.5 .