Methods.md

Methods

(FBWithMethods.cs)

Beside the obligatory methods for initialization and execution, a class can contain optional methods. To make these user methods available in IEC, the attribute [User] is used.

For input methods, the method must be marked with the [Input] parameter.

[User]
public void SetX([Input] int x)
{
    CurrentPosition.x = x;
}

As in the Complex Data Types example, user methods must also return complex types by reference. The return variable must have the method name and marked with the [Output] attribute. Otherwise it will be interpreted as an [InOut].

[User]
public void GetPosition([Output] ref Position GetPosition)
{
    GetPosition = CurrentPosition;
}

NOT SUPPORTED: Complex data types as return value!

        [User]
        public Position NotSupported_GetPositionReturningTheStructure()
        {
            return CurrentPosition;
        }