Raw manufacturing data storage for hierarchical control

The collection of the information resulting from the activity of the physical system of manufacturing workshops must facilitate real-time workshop control, but also permit the use of line statistical historics for longer term decision making. A data structure is suggested which can satisfy these two objectives when used on a great variety of production systems. The approach is based on events and states identification, then on their storage in an adequate database structure. The database structure is described with the relational formalism, and a practical example is given