Ethernet in Water and Wastewater Treatment

EtherDevice™ Switch EDS-726 Industrial 26-port Gigabit Managed Redundant Ethernet Switch

Korea

Water Treatment Plant

Business Benefits

	EDS-726 provides long distance multimode fiber support.

	The Dual Turbo Ring feature makes configuration and management easier for:
		Double media redundancy
		Network node redundancy

	EDS-726 provides more ports to connect office devices in central control.
		Simplified networking
		Savings on cabling costs

	EDS-726's modular design allows for flexible configuration and expansion.




	Korean Water Treatment Plant Uses Moxa's EDS-726 to Upgrade Monitoring and Control

	Introduction

	Access to clean water is an important part of every human life in the world. As communities grow, most water treatment plants scale their processes to collect and process water to meet the added demands of the area. Water treatment plants can be very large in size, and usually include land for storage tanks, processes, sediment ponds, maintenance buildings, and more. Water is collected from multiple wells, reservoirs, and rivers, and then pumped to the water treatment plant, where it is treated and then delivered to customers. To monitor and control processes, utilities have traditionally relied on proprietary communication protocols, so the costs of installation, maintenance, and replacement of spare parts can be high.



	System Description

	The Aha Sa water plant in Korea, a major water treatment facility that has supported the local area's population and industrial growth for the last twenty years, recently upgraded its monitoring and control SCADA system using Moxa's EDS-726. This 26-port fiber modular Ethernet switch supports a fiber-based Ethernet network infrastructure with a dual turbo ring redundant fiber backbone. The plant treats nearly all of the water used in the district using workstations interfaced with proprietary PLC control equipment to control pumps, valves, and other equipment that moves the water through the various treatment processes. The Aha Sa water plant was looking to upgrade their network infrastructure with state-of-the-art Ethernet technology that was readily available, cost-effective to integrate, and could help collect data from numerous locations throughout the plant. An added benefit included Ethernet's ability to support future upgrades and expansion seamlessly.

	The Aha Sa plant chose the EDS-726 26-port managed gigabit Ethernet switch because it provides multiple, easily-configured, modularized ports that support multimode fiber for the long distances necessary to cover the entire plant site. Furthermore, the switch offers excellent reliability via self-healing network recovery in less than 300 ms from broken LAN connections. EDS-726 can handle all PLC data collection needs as well as centralized control and administrative support, effectively reducing cabling with a more efficient ring topology. The double media ring, together with redundant node configurations for all critical processes, significantly reduced the possibility of system downtime and strengthened disaster recovery. EDS-726 allowed the Aha Sa plant to move away from their proprietary protocols, decrease component and maintenance costs, and add the gigabit bandwidth necessary for additional monitoring and communications, such as video and voice. The fiber backbone was also more resistant to electromagnetic interference and transient voltages caused by the harsh weather conditions the plant sometimes experiences.

	Better Response and Control

	After the upgrade, operators could easily check the status of all processes from anywhere on the network. The ability to monitor storage tanks, levels, and flow rates in wells and reservoirs, and quickly open or close valves during changes in demand, allows the plant to adjust flow to city water lines more efficiently and maintain a more stable system. It is easier to determine the cause and location of malfunctions, and includes automatic notifications to operators and system controllers for alarm events. The system has simplified decision making by automating many processes, such as refilling multiple storage sites that were previously hard to monitor and control. The new system also allows the plant to store more easily the results of sampling, schedules, and maintenance activities, and helps supply data to generate the diagnostic reports that are essential to any water treatment facility.

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