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A distributed-data acquisition and monitoring system for the beam instrumentation of LEP

1990; Elsevier BV; Volume: 293; Issue: 1-2 Linguagem: Inglês

10.1016/0168-9002(90)91433-c

1872-9576

G. Baribaud, D. Brahy, A. Cojan, F. Momal, M. Rabany, R. Saban, A. Thys, J.C. Wollès,

Distributed and Parallel Computing Systems

The beam instrumentation for LEP is comprised of a number of detectors such as current transformers, split-foil monitors, interaction and background monitors and electrostatic pickups. These instruments are interfaced using about 100 VME crates spread over 25 stations located around the 27 km circumference of LEP. The crates are connected to the control system using MIL/STD-1553, an Olivetti M380 running XENIX and an IBM token-ring. Each crate is equipped with a Themis TSVME106 CPU board which runs the Motorola RMS68K operating system kernel. A set of services (alarms, communications, I/O system, libraries, log book, timing, etc.) has been implemented and constitutes a comfortable environment for the application programs. Most of the programming is done in PASCAL, using a cross compiler developed and maintained at CERN. A set of utilities running in the Olivetti M380 and in the crates provides system monitoring, system and application reload, and surveillance of the behaviour of the system and of the application task.