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The tool modifies the offline project database stored on a hard drive to flip the protection bit on Organization Blocks (OBs), Function Blocks (FBs), and Functions (FCs). Starting from version 1
: It can toggle protection for Function Blocks (FBs), Functions (FCs), Organization Blocks (OBs), and Data Blocks (DBs). Starting from version 1.4, it can also display the contents of User Data Types (UDTs). Limitations
S7CanOpener’s core functionality revolves around its ability to manipulate the “KNOW_HOW_PROTECT” attribute of individual program blocks. This protection mechanism was designed by Siemens to prevent unauthorized viewing or modification of proprietary PLC code. However, as security researchers have repeatedly demonstrated, this protection is not robust encryption.