发表于:2007-11-20 15:57:00
楼主
Solutions: Utilities/Water Treatment
Water Treatment Plant Solves Network Disruptions with Industrial-Grade Ethernet
Contemporary Controls' Industrial-Grade Ethernet Hub Wins Over Office-Grade Equipment
When you drink tap water it tastes fresh and clean, but only because it has been purified in a water treatment facility. One such facility is the Joe Mullins Reverse Osmosis Treatment Plant in Melbourne, Florida. The plant processes water drawn from three Floridan Aquifer System wells, close to 850 feet underground. The Reverse Osmosis membrane system removes salts, metals, and minerals from the water obtained from the Floridan Aquifer. Upon completion of the treatment process, the water quality is similar in purity to that of distilled water. Along with the John A. Buckley Surface Water Treatment Plant, the Joe Mullins facility meets the demand for water that is nearly 15.5 Million Gallons Per Day (MGD) to the system's 150,000 consumers.
Achieving this required a network infrastructure utilizing Ethernet technology for it was cost effective to integrate and had the ability to support future expansions. (In the near future, the City will spend more than 19.3 million to expand the treatment capacity of the plant to 13.0 MGD.) But from the perspective of the Instrumentation Technician, Vaughn Curry, the significance of Ethernet technology in this application was speed! "10 Mbps versus 1900 baud rate for hard wired," said Curry. "That was the primary reason." Curry administers the control software, and he is also responsible for equipment integration to the server. "I maintain and modify the screens that the operator use to control the plant," he explained.
In the beginning, Curry disagreed with the City's IT department. "The IT department became an unnecessary evil," he said. "IT provides the hardware and software upgrades for all the PCs at the plant. We budget the money to IT to maintain our PCs. We employ GE Cimplicity Software to control and monitor the treatment process which runs on 'servers' dedicated to this end. The GE Fanuc PLCs monitor flow, pressure, pH, etc. and through the use of Ladder Logic makes auto-adjustments in the process. However, we didn't&n