Companies must increase their flexibility and enable high product customization and variety to meet market demands. In assembly, this requires a large number of special machines, which leads to high investments and space requirements. This paper presents a concept for a modular, reconfigurable assembly system that allows unrestricted connection of individual modules. It is shown how such a system can be located in the RAMI4.0 framework and fulfills changeability requirements on different production levels. (Only in German)