Supervisory Control and Data Acquisition system for county-wide water distribution system. Operators use X-windows workstations to monitor pump stations, water treatment facilities, and elevated storage tanks. The City of Chicago system consists of seven distributed computer control systems, each with attached RTU's which control and monitor 150 MGD pump station facilities. The pump station computers are DEC VAX-2000 networked to a Central Control Center equipped with dual, redundant MicroVAX II processors via leased DDS channels. In-plant communications is via an Ethernet local area network.
Interplant communications is via a direct digital data network.
This will to double its current size. Chicago has the equivalent of 16 large RTU's with a composite point count of 8000 inputs. This will to double its current size. Chicago has the equivalent of 16 large RTUs with a composite point count of 8000 inputs. The plant control system consists of a central computer communicating with distributed PLCs via a plant data highway with 38 local control panels and field instrumentation.