The ProfiMessage D impresses with its consistent modularity: each master or slave device can be equipped with up to two I/O modules, with a total of nine different modules to choose from. Master devices without an internal I/O module are also available for pure fieldbus applications. Up to 20 slave devices can be connected to a master device via a robust, real-time-capable extension bus using two-wire technology - distributed centrally or decentrally. This creates a highly flexible system that can be adapted precisely to the task at hand.