1. An integrated circuit in which at least one additional supplementary module of the same type is assigned to an individual module or a plurality of ordered modules forming cells, each with at least one input and one output, characterized in that the cells are bus systems, arithmetic and logic units and/or in particular configurable logic cells, and a first switching element is connected upstream from the input of the module and is designed to switch the input to either the module or its following module, and another switching element is connected downstream from the output and is designed to receive the output from either the module or its following module, so that in the case of an error in one of the modules, in particular an error that can be detected by a self-test, the defective module and/or function cell can be replaced by its following module by switching the switching elements, with the last module being replaced by the supplementary module.