How do you create a user-defined function block in TIA Portal?

To create a user-defined function block in TIA Portal, you start by specifying the block type and then defining its inputs, outputs, and logic. This process allows users to tailor a function block to their specific requirements, enabling them to encapsulate custom logic, calculations, or processes that can be reused throughout their automation projects.

When you define the inputs and outputs, you ensure that the function block can interact appropriately with the rest of the system, exchanging necessary data. Following this, you implement the logic within the block, which could involve various programming elements, such as instructions and functions that define how the block behaves during its operation.

The other options, while related to using function blocks, do not pertain to creating a new user-defined function block from scratch. Importing existing function blocks suggests using pre-made components rather than developing new ones. Executing a predefined script implies automation or scripting capabilities rather than the manual creation of function blocks. Utilizing a graphical interface only would limit the flexibility needed to create tailored function blocks, as defining logic and data exchange characteristics is integral to the creation process.