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Libraries

Libraries are used to store and reuse POUs and data types. Libraries can be used in multiple projects, and they can be imported into a project. To add a library, you first have to create a new project with the type Library, define its content, and then import it into the project where you want to use it. Libraries are not mandatory, but useful to structure your projects and make your code reusable.

Creating a library​

To create a library, you have to create a new project with the type PLC Library. To do this, navigate to projects and click on the green + icon. For the Project Type select PLC Library

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After you have created the library, you can add POUs and data types to it. To do this, navigate to the library project and create a new POU or data type.

Using a library​

To use a library in another PLC project, open the project where you want to use the library. In the project tree, right click on libraries and select add library. In the dialog, select the library you want to add and click Save.

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After you have added the library, you can use the POUs and data types from the library in your project by simply calling them inside your program as you would with locally defined POUs and data types.

Function example​

FUNCTION ADD_NUMBERS:REAL

VAR_INPUT
    VAR_1: REAL;
    VAR_2: REAL;
END_VAR

ADD_NUMBERS := VAR_1 + VAR_2;

END_FUNCTION

Using in your program code:​

PROGRAM Main

VAR_INPUT
    IN_1, IN_2: REAL;
END_VAR

VAR_OUTPUT
    OUT_1: REAL;
END_VAR

OUT_1 := ADD_NUMBERS(IN_1, IN_2);

END_PROGRAM
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