S7 Can Opener
Set and remove the lock on the KNOW HOW PROTECT on S7-300/400 blocks!
NOTE: it does NOT unlock latest S7 v5.5 “Block privacy” protection
Steps to Unlock the Blocks
Language supported: English only.
Download S7CanOpener manual
Current version is v2.0
If you are a registered user and own an older release, contact us for a free update.
Q: What’s the S7CanOpener purpose?
A: the S7CanOpener can unlock S7 blocks protected with the “know_how_protect” keyword.
Q: Can it unlock also S7 libraries?
A: Yes, it works on S7programs (*.s7p) and S7libraries (*.s7l)
Q: Can it unlock Step7 v5.5 new “Block Privacy” protection ?
A: No, at the moment the tool is not able to decrypt such protection.
Q: I have a PLC that requires a password for online operations, can I use the S7CanOpener to defeat the password?
A: No. The S7CanOpener operates on projects stored on the hard disk, it does not operate online in the PLC memory and does not remove the password set in the CPU at hardware configuration level.
Q: Will I be able to read the comments within an unlocked block?
A: Yes, if the original block contained comments.
Q: I have some SCL or CFC blocks, can I reverse the code to obtain the source file?
A: No. In case you have SCL, CFC, GRAPH7, HIGRAPH blocks, once unlocking them you will get the compiled version of the block or, in other words, plain STL code with no comments and no variables name at all. If you expected the full-source text file, it is not possible: in that case your only chance is to get the original SCL or CFC source file. On the other hand, if you are however interested in the blocks’ contents, you have a way to peep into the STL version of the code.
Q: Can I lock/unlock UDTs?
A: Yes, from version v1.4 you can lock also UDT (User Data Type) blocks. Unlike all other blocks (OB, FC,FB), a protected UDT cannot be modified but its contents can be displayed.
Q: Can I unlock SFCs and SFBs?
A: SFCs and SFBs cannot be unlocked since they are functions stored in the PLC’s system memory and cannot be read. What we see and use in S7 is just the block’s interface (parameters assignment) and not the complete block. Offline SFCs and SFBs contain no S7
Demo Version S7 Can Opener v1.3
S7 Can Opener Full Version