A VXI SYSTEM FOR THE OBSERVATION OF DISTRIBUTED ANALOG-SIGNALS

To replace an aging multiplexed observation system of about 1500 analo g signals originating in 5 machines of the CERN PS Complex a VXI syste m consisting of various oscilloscope and multiplexer modules housed in local crates has been developed. The crates are linked together via a n Ethernet cable and run under the VxWorks operating system. An on-lin e Oracle database allows for reference signals and observation setting s to be saved and restored. The signals are displayed within one hundr ed milliseconds after their capture on virtual oscilloscopes on DEC wo rkstations; these oscilloscopes include all the usual features plus th e specific controls related to the CERN context. Two systems accessing about a hundred signals, were delivered in March 1993 as a part of th e PS-SL controls rejuvenation project. This paper will describe the ha rdware and software structure, the current and expected performances a s well as costs and forecasts.