The Advanced Photon Source control system

The Advanced Photon Source (APS), along with its injection accelerators, is to be controlled and monitored with a single, flexible, and expandable control system. The control system must be capable of operating the APS storage ring alone, and in conjunction with its injector linacs, positron accumulator, and injector synchrotron for filling as well as operating both storage ring and injection facilities as machines with separate missions. The control system design is based on the precepts of high-performance workstations as operators consoles, distributed microprocessors to control equipment interfacing and preprocess data, and an interconnecting network. The current design includes about 45 distributed microprocessors and five console systems, which may consist of one or more workstations. Hardware and software organization is discussed for this control system.<>