A method and a device for configuring a hardware component, in particular of a configurable safe input/output module, includes using a configuration program that is designed to display a graphical user interface on a display apparatus that is connected to a data processing system, which user interface provides function blocks having inputs and outputs. By way of the method and the device, two function blocks can be interconnected so as to form a combined function block having at least one input and one output, at least one of the inputs or outputs of the first function block and at least one of the inputs or outputs of the second function block forming at least two of the inputs/outputs of the combined function block.