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 how to implement your own FC (Function) and FB (Function Block) into it. Additionally, how can you write FC blocks quickly and protect your FB blocks with encryption? Here's a detailed guide.

Part 1: Creating a Library in STEP7

When working on a project, especially one that requires frequently used functions like equipment runtime tracking or alarm handling using SFC17 and SFC19, it’s helpful to create a personal library. This allows you to store commonly used function blocks and function calls for easy access in future projects. This not only improves efficiency but also helps maintain consistency across different projects.

Here’s how to create a library in STEP7:

  1. Open the SIMATIC Manager software.
  2. Click on "New Project" from the File menu.
  3. Give the project a name and choose the project type as "Library". You can keep the default location unless you have specific requirements.
  4. In the new project, insert your desired FC or FB blocks. When editing these blocks, make sure to use local variables rather than global ones like M, I, Q, or shared data blocks. Avoid using OBs (Organization Blocks) as they are not suitable for libraries.
  5. Once the block is saved, it becomes available for use in other projects, making your development process much faster and more efficient.

Part 2: Writing FC Blocks Quickly and Protecting FB Blocks

If you want to speed up your FC block creation, it's best to follow standard practices, such as organizing your code logically and reusing existing blocks where possible. For FB blocks, especially those containing proprietary logic or sensitive data, protection is essential.

To encrypt an FB block in STEP7, follow these steps:

  1. Open the program block in LAD/FBD/STL editing mode.
  2. Generate a source file by selecting "File > Generate Source" from the menu.
  3. Close the original block and open the generated source file in the SIMATIC Manager project window.
  4. In the declaration section of the block, add the line KNOW_HOW_PROTECT below the TITLE line.
  5. Save the file and compile it using "File > Save" and "File > Compile".
  6. Once done, the block is encrypted and protected from direct modification, ensuring your intellectual property remains secure.

This method ensures that your custom blocks are both reusable and secure, giving you full control over how your code is used and accessed in future projects.

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