Res 2004-035 - Laserfiche WebLink

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252. ATTACHNENT A Supervisory Control And Data Acquisition System Upgrade The locations considered by the scope of this proposal at the City of San Marcos, TX will depend upon the sites selected by the City. Them will be a mix of water pump stations, water pressure monitoring locations, sewer lifl stations and the central site server location. In November of 2003, Data Flow Systems, Inc., RF Engineering Department, with data provided by BLOC Design-Build, LLC, undertook and completed a radio propagation study encompassing the lopography and locations where water/wastewater infrastructure is operated by the City of San Marcos, Texas. The purpose of this study was to determine the RF requirements for reliable communications with 20 dB fade margins built in to ali remote radio links. The wastewater treatment plant was used as the central site server location. A licensed VHF frequency has been selected which is isolated from the nearest user on the same frequency by a minimum of 250 miles..Once radio communications am established, the City will enjoy real time, Supervisory Control and Data Acquisition, with '- n accurate +2 second time tagging message structure with all new RTUs. ..~esigning a dependable radio communications system is the first step in providing an effective solution for system operation. Next is an automation solution that will address the operator, utility staff and administration operational guidelines based on a host of Variables. Our solution 'will provide features that Will effect automatic control by extending operator knowledge through the SCADA system's browser based Human Machine Interface (HMI). The following paragraphs describe our concept for the proPosed SCADA system operations based on site visits, existing SCADA configurations and conversations with San Marcos utility staff. We do understand that this system design will evolve over time as our discussions continue. We wish all involved to understand that the following descriptions may not be final and that we are flexible and our interest is to provide the best possible solution for the City of San Marcos. All SCADA functions will be user friendly and designed with the typical utility operator in mind, ease of repair, replacement and functionality. The proposed SCADA system equipment can easily be divided into four categories, The Central Site (CSE), Telemetry (Pump) Control Unit TAC Packs, Remote Terminal -Units (RTU) and Modbus devices. The CSE will have a Hyper SCADA Sever (HSS) which is manufactured by Data Flow Systems, Inc., (DFS); The HSS is a self:contained data collection and information server housed in a custom, wall-mounted box. The Hyper SCADA Server contains