During the last decade, the synchronous approach has proved to meet industrial needs concerning the development of Distributed Control Systems (DCS): as an example, Schneider Electric has adopted the synchronous language Lustre and the associated tool Scade for developing monitoring systems for nuclear power plants. But so far, engineers make use of LustreScade for designing separately single components of a DCS. This paper focuses on the use of Lustre-Scade for designing DCS as a whole. Two valuable consequences of this approach are that (1) the same framework can be used for both programming, simulating, testing and proving properties of a distributed system, and (2) the proposed approach is fully consistent with the usual ing abstractions concerning smooth signals.