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Industrial Ethernet Book 99

Pump stations, reservoirs, and other resources at remote sites are monitored and controlled from the water district’s headquarters. SOURCE: OPTO 22 on investment possible. “The distributed intelligence capabilities of the SNAP PAC System allowed us to prototype, test, and roll out upgrades to one remote site at a time,” said Alan LeVezu, Engineering Manager at IDAC West. “We were able to run both existing and new systems in parallel and cut over to the new system when we were ready to.” “We also utilized the research and development test center at IDAC West headquarters to design and prototype new features of the updated system. This allowed us to verify that the new controllers, I/O, and updated control software were running as intended before cutting over to the upgraded system,” he said. “Using other SCADA systems often requires the system to be taken offline for several weeks to perform a complete upgrade,” said Dave Smith, President of IDAC West. “Using our R&D test center reduces the District’s downtime for upgrades from weeks to just a couple of hours.” “We can also provide our customers with remote training through online meeting applications, where they can work with an Opto 22 system in real time over the Internet,” added LeVezu. Intelligence at the edge LeVezu put many of the SNAP PAC System features into use during the design and rollout of the new SCADA system. The distributed intelligence of the SNAP PAC System creates an ability to perform process control at each individual site. Because each controller and brain in the SNAP PAC System is intelligent, they were able to configure set points directly at each site so that if the network goes down, the site continues to operate autonomously. The SNAP PAC System also allowed the District to take advantage of the latest networking communications protocols, such as Ethernet and TCP/IP. Each Opto 22 programmable automation controller (PAC) and I/O processor (called a brain) has two built-in Ethernet network interfaces as well as an optional 802.11 wireless interface. “With built-in Ethernet already on the controller, we don’t need to purchase additional Ethernet cards or upgrade the controller to a higher-priced model to add networking capabilities,” said LeV Automation impact on Vista Irrigation Districtezu. As the SCADA system was transitioned from serial to Ethernet, system performance was also improved. Using the SNAP PAC controller’s built-in Ethernet traffic monitoring capabilities, LeVezu was able to display network performance statistics between Vista’s headquarters location and remote sites directly in an HMI system. This increased visibility into the system provides the District with near real-time situational awareness at all of its remote sites. The District’s 30 remote field locations consist of pump stations, source water connection points, 12 reservoirs, and several flow control facilities. Field locations are woven together with over 435 miles of pipeline to move water throughout the District. The SNAP PAC System monitors and controls valve positions, flow rates, pressure, and reservoir water levels intelligently, depending on the requirements of other system components and zone water usage nearby. Some of the District’s field sites are powered by solar panels where commercial power proved to be cost prohibitive to install. The SNAP PAC controller and I/O at these solar sites are powered via batteries that are charged daily through solar panels. The SNAP PAC System not only provides control and monitoring for the site, it also monitors the health and performance of the solar system. Through the use of a consistent family of products, the District has been able to upgrade its hardware while maintaining solutions for its legacy systems. Over a 23-year period, the District has migrated through three generations of Opto 22 products, the latest being the Ethernet-based SNAP PAC System. Application case study by Opto 22. Applications The smarter the computing … the smarter the city. Intelligent computers for modern cities. • Easy installation and maintenance • Cyber security function • Rack-mountable, rugged enclosure Moxa embedded computers: energy, transport, communication … www.moxa.com 23 4.2017 industrial ethernet book


Industrial Ethernet Book 99
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