BNL, Upton, Long Island, New York
Stony Brook University, Stony Brook
Tech-X, Boulder, Colorado
CLASSE, Ithaca, New York
Data Distributed Service (DDS) from the Object Management Group represents the next generation of industrial middleware standards, bringing a data-centric publish-subscribe paradigm to distributed control systems. In comparison with existing middleware technologies, the data-centric approach is able to provide a consistent consolidated model supporting the different data dissemination scenarios and integrating many important issues, such as user-specific types, quality of service, data stream management and others. The paper highlights the different features of the DDS technology and introduces a prototype of the NSLS-II high level application environment including key middle layer servers, such as Machine, Online Model and Virtual Accelerator. The proposed environment is developed and evaluated on top of EPICS-DDS, an open source implementation of the DDS standard interface based on the EPICS Channel Access protocol (http://sourceforge.net/projects/epics-dds/).
BNL, Upton, Long Island, New York
LBNL, Berkeley, California
The NSLS II is a new third generation light source. The project is pushing control system technology in three areas: fast orbit feedback, use of RDB technology, and model based control architecture. This paper describes these developments in terms of the overall control system architecture.