The automation software house will be no longer in business? S7CanOpener FAQsQ: What's the S7CanOpener purpose?A: the S7CanOpener can unlock S7 blocks protected with the 'knowhowprotect' 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.
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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 code.
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Maybe there is a more simply way of doing this but this is the only way I know. If you have a programblock, say FB10. Open it and create a source of it. File - Genereate Source. Add FB10 to the Source.
Close FB10 and open the source, and the your header sould look something like this. FUNCTIONBLOCK FB10 TITLE = VERSION: 0.1 - Code below - Add KNOWHOWPROTECT last in the header FUNCTIONBLOCK FB10 TITLE = VERSION: 0.1 KNOWHOWPROTECT After this you need to compile the block. File - Compile Now a new FB10 has been created that is protected. Save your Source in a safe location becuse if you loose it, its a bit harder to open the block again. It can be done but then you need to modify some DBF files. Regards Edmund. After all, why apply knowhow protect to a block, that is only to mess things up to the customer.
They have the right to see the code they pay for and it necessary when searching for errors. Are people afraid that someone going to steal their great outstanding peace of code or are they just afraid to show their lack of programming skills?! I made a little video tutorial how to remove knowhow protection from a blocks without any special tool for it (such as S7 Can Opener). You can watch it here (link removed for Terms of Service violation) Regards Edmund Andersson. This debate comes up over and over. Protection of the PLC code is the same as applying for a patent.
It's a way for a person who invents something to be certain it is not copied illegally in the future. If you wrote a book and someone published it on the Internet, would you NOT sue them for losses? If you designed something and got a patent, would you NOT sue the company who is stealing your work? Of course you would. BECAUSE IT'S YOUR WORK. And someone else is trying to profit from it, or prevent you from profiting from it.
But when it's intellectual property, not something physical, you all feel the same rules don't apply. That is truly sad. I'm on vacation and typing on my iPhone so I'm gone keep this short. I don't encourage stealing of someone else code or solution. I would never steal someone else code BUT if I see a code snippet that is real smart and Good I keep that on mind, maybe developing to be even shorter, smarter and faster if possible.
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Maybe you call it code stealing but I don't! It's a way of getting better of what I do. I have never heard of any case were some firm has stole some one elses PLC code and put it in there one machine or plantcontrol.
That reason to refuse to give out the code is just ridicules, the only reason to not supply the custumer with code is for making more money (upgrades, support, maintenance etc.). If I was sitting on the other side of the table I wound never buy a machine were I don't get the complete backups. The customer has the full right to the code but if he gives it to a third part (a bad guy) then he makes a mistake but until then. Well anyway there is always two sides to every story and the discussion about this subject will always continuo.
Jesper, nothing is unbreakable. It's just needs some more effort Best regards /Edmund. I have been involved with panel building, and I do not typically protect my programs, as I agree maintenance needs to be able to see it to support it. But I have had 2 cases where customers DEMANDED that the PLC be password protected because in one case one of their competitors was also selling systems in the same plant, and they had been caught stealing their code and duplicating their machines.
Big legal case. I agreed and provided the password to the OEM.
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Up to him if he desires to share it with the customers. In another instance, I was asked how to password protect the PLC.
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I demonstrated the capability to the customer. He then went about setting passwords in all his PLCs.
I once had a guy ask me how to write a cycle counter and make the machine stop running after a certain number of cycles until they called him and purchased a new passcode. I told him it would require some compare statements and writing the code numbers into the PLC (either hard coded or retentive) but that any programmer would be able to understand it in the code and work around it. You don't have to remove it from Youtube, that's your call. If it circumvents a feature for protection of intellectual property (hacking), it's against the terms of service of this website. So you can't post it here. We have no say over what you do on YouTube. You always contribute to the forums, and it is appreciated.
We are all still friends. We just have to walk a tightrope with the number of lawyers in the world. So discussions which are in the gray area of legal are as off limits as the ones which are black and white. I hope you understand.