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Krishna Manandhar
Krishna Manandhar

S7CanOpener [Full Version] 41

S7CanOpener [Full Version] 41: A Tool to Unlock S7 Blocks

If you are working with Siemens S7-300/400 PLCs, you may have encountered the problem of blocks being protected with the "know_how_protect" keyword. This means that you cannot view or modify the blocks without the original source code, which may be lost or unavailable. This can be a serious issue if you need to troubleshoot, update, or maintain your PLC programs.

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Fortunately, there is a tool that can help you unlock the protected blocks and access their contents. It is called S7CanOpener [Full Version] 41, and it is a software application that can set and remove the "know_how_protect" keyword on S7 blocks on the fly. It works on S7 programs (*.s7p) and S7 libraries (*.s7l), and it can handle different block families (FBs, FCs, OBs, DBs, UDTs).

How to Use S7CanOpener [Full Version] 41

Using S7CanOpener [Full Version] 41 is very simple and straightforward. Here are the steps you need to follow:

  • Make a backup copy of your Step7 project before using the tool. This is a precautionary measure in case something goes wrong.

  • Close all applications that may interfere with Step7 project files, such as S7 Manager, S7 editor, Protool, etc.

  • Run CanOpener.exe and from the "Open" menu select the desired S7 project or library. You will see a list of all "blocks" folders in the project.

  • Select the "blocks" folder that contains the blocks you want to unlock. You can filter different block families using the buttons at the bottom.

  • Select the blocks you want to modify the protection status. You can use multiple selection to operate on several blocks at once.

  • Use the "Protect" or "Unprotect" buttons to set or remove the "know_how_protect" keyword. You will be asked for a password at the first request each time you run the program.

That's it! You can now view and edit the unlocked blocks as you wish. You can also lock them again if you want to protect them from unauthorized access.

Benefits of S7CanOpener [Full Version] 41

S7CanOpener [Full Version] 41 is a useful tool for anyone who works with Siemens S7 PLCs. It can help you in many situations, such as:

  • Your machinery supplier or system integrator does no longer support the software they developed and you need to access or modify the PLC programs.

  • You lost your source code and you cannot access your compiled blocks anymore.

  • You want to keep just one copy of your blocks instead of maintaining both compiled and source copy of each block.

  • You want to toggle the "know_how_protect" keyword on-the-fly, without having to compile your blocks.

S7CanOpener [Full Version] 41 can also unlock UDTs (User Data Types), which are not editable even if they are not protected. However, it cannot unlock SFCs (System Function Calls) and SFBs (System Function Blocks), as they are stored in the PLC system memory and cannot be read. It also cannot unlock Step7 v5.5 new "Block Privacy" protection, which is a different type of encryption.

Where to Download S7CanOpener [Full Version] 41

If you are interested in downloading S7CanOpener [Full Version] 41, you have two options:

  • You can download a demo version from [Blog.Teknisi]. This version will only show you the blocks and their protection status, but will not allow you to modify them.

  • You can download a cracked version from [Diligencer]. This version will let you use all the features of the tool without any limitations.

However, we recommend that you purchase the original version from [Runmode], as it is the official and legal source of the tool. The price is $250, and you can pay with PayPal or wire transfer. You will receive a registration code that will activate the full functionality of the tool. You will also get free updates and support from the developers.


S7CanOpener [Full Version] 41 is a powerful and handy tool for unlocking S7 blocks protected with the "know_how_protect" keyword. It can help you access and modify your PLC programs without the need for the original source code. It is easy to use and works on S7 programs and libraries, as well as different block families. It can also unlock UDTs, but not SFCs, SFBs, or "Block Privacy" protection.

If you want to download S7CanOpener [Full Version] 41, you can choose between a demo version, a cracked version, or the original version. We advise you to buy the original version from Runmode, as it is the most reliable and legal option. You will get a registration code that will enable all the features of the tool, as well as free updates and support.

We hope this article has been informative and helpful for you. If you have any questions or comments, please feel free to contact us.


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