Control System of the SPring-8 Storage Ring

The SPring-8 storage ring is under construction and will be commissioned in February 1997. The design for the control system of the storage ring adopted the so-called Standard Model concept. VMEbus is used as the front-end control system and is widely distributed around the 1436m circumference of the storage ring. The VMEbus is controlled by a single-board-computer with a RISC processor. The VME crate is connected to the FDDI backbone network through an FDDI-Ethernet switching hub. The CPU boards use the LynxOS-based HP-RT real-time operating system. The remote I/O system (RIO), interconnected by optical fibers, is used as the field bus. The operator console system consists of UNIX workstations with a human-oriented interface built using a Motif-based GUI builder. The control software design is based on the event-driven client-server scheme. The remote procedure call (RPC) is used for communication between machine control applications over the network. Accelerator operation history and equipment parameters are stored in a standard database, using an RDBMS.