How to write FC block and FB block into the library in STEP7 - Database & Sql Blog Articles

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How to create a custom library in STEP7 and integrate your own FC (Function) and FB (Function Block) into it. Also, how to quickly write FC blocks and protect your FB blocks with encryption. Here’s a detailed guide on both topics.

Part 1: Creating a Library in STEP7 and Adding Your Own Blocks

When working on a project in Siemens STEP7, you may find yourself using the same functions repeatedly—like tracking equipment runtime, handling alarms with SFC17 or SFC19, or managing data structures. To streamline this process, it's highly recommended to create your own library for these commonly used blocks.

You can create a custom library by following these steps:

  1. Open the SIMATIC Manager programming software.
  2. Go to the File menu and click on "New Project."
  3. Give the project a name and choose "Library" as the project type. You can use the default storage location or select another if needed.
  4. Once inside the new project, insert the desired FC or FB blocks.
  5. Edit the internal variables of these blocks using only local variables (avoid using global variables like M, I, Q, or shared data blocks). Also, make sure not to include OB (Organization Block) in your library, as it is not compatible with library usage.
  6. After saving your blocks, they will be available in future projects, making it much easier to reuse your code and significantly reducing development time.

Part 2: Writing FC Blocks Efficiently and Encrypting FB Blocks

If you want to protect your custom blocks from being viewed or modified, you can use encryption features in STEP7. This is especially useful when sharing your work with others or deploying it in a secure environment.

Here’s how to implement block protection:

  1. Open the program editing window (LAD/FBD/STL).
  2. Convert the block you want to protect into a source file. Go to the File menu and select "Generate Source." This will create a .s7s file containing the block's source code.
  3. Close the original block in the LAD/FBD/STL editor and open the generated source file in the SIMATIC Manager project window.
  4. In the declaration section of the block, after the TITLE line, add the line: KNOW_HOW_PROTECT.
  5. Save the file and compile it by selecting "File > Save" and then "File > Compile."
  6. The block is now encrypted and protected. It will no longer be visible in the LAD/FBD/STL view, but it can still be called and used in other programs.

This method ensures that your intellectual property remains safe while allowing you to maintain control over your code. Whether you're developing a small application or a large-scale automation system, creating libraries and protecting your blocks are essential practices that improve efficiency and security in your STEP7 projects.

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