HVAC Control in the New Millennium.pdf - HVAC.Amickracing

Advanced HVAC Control, Information Technology and Open SystemsWindows and NT. With dial-in and auto-dial telecommunication twistedpair or thinnet connections can be used.Windows Control SoftwareWonderware uses Microsoft Windows for their human-machineinterface (HMI) software. Wonderware software includes InTouch as a(HMI) for visualization, InControl for Windows NT-based control andScout as an Internet/Intranet tool for remote data viewing.InTouch provides a single integrated view of all control and informationresources. It allows operators to view and interact with theworkings of an entire operation using graphical representations. It includesremote tag referencing, ActiveX support, distributed alarm handling,and distributed historical data. Individual alarms help users toquickly identify rules that were violated. Users can track corrective actionsand set limits on the fly. A high-speed communications protocol,based on TCP/IP, is used to provide performance-optimized data communicationin the Windows NT environment for real-time, peer-to-peercommunications.InControl is an NT-based real-time open architecture control systemthat allows the user to design, test and run application programs forcontrolling a process. Direct interfaces to a variety of I/O devices, motors,sensors, and other equipment are available.The Internet visualization module acts as a web server add-on andclient browser that allows read-only remote viewing of data and visualobjects over the Internet/Intranet. In the client or browser mode, visualobjects can be viewed from the server using a standard browser. Thesoftware extends a browser’s capability by providing a set of userconfigurableActiveX objects such as graphs, charts, and trend elementsthat can be dynamically linked to the data. In the server mode a set ofweb server components runs on Microsoft’s Internet Information Server(IIS) and links applications to the Internet.Building managers may soon see their roles expanding with theresponsibilities for all electrical systems. Just as the division betweentelephone and information systems has largely disappeared, processcontrol and facilities management are also headed for closer links tocomputer networks. This convergence between applications is madepossible by open systems that can control manufacturing equipment,©2001 by The Fairmont Press, Inc. All rights reserved.