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

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HVAC Control in the New Millenniumsame challenges found elsewhere in the enterprise. Communication andnetworking standards abound. Programmable logic controllers (PLCs),temperature controllers and PCs all have well-defined but sometimesoverlapping roles. The longevity of the equipment means that controllersand software do not always reflect the latest technologies, especiallyin the area of communication capability.Often, replacing expensive equipment just to improve the controllercapability is not practical. So, while PCs are recycled quite rapidly,equipment controllers, or at least the underlying designs of the controller,may be 5 or more years old which is aged in computing years.Enhanced communications capability might justify adding features toexisting equipment, such as tracking energy or fuel use.Using Internet technologies on a local network to create a localIntranet allows you to integrate many of these systems without a significantimpact on operation (Figure 9-1). Networking allows the display ofnew information, as well as the addition of new control features. TheIntranet servers are Web servers with off-the-shelf Web browsers, suchas Netscape’s Navigator or Microsoft’s Internet Explorer, combined withnew Java-based technology to provide better access.The use of Web techniques is fairly straightforward. Information isprovided to clients by a Web server. On the Internet, a server may receivemany millions of requests for information every day and Webservers are typically dedicated and high-powered computers. For a facilityIntranet, the number of requests for information is relatively small,so a Web server can run on a standard off-the-shelf PC system equippedwith a network interface. These systems can run the user interfaces.They can also function as real-time controllers.Web enabling equipment allows anyone with a Web browser andthe appropriate permissions can access the information. This makesaccess to control information uncommonly simple. Once the client computeris set up and networked, you just need the familiar Internet address,or URL. This address might take the same basic form as an externalURL, such as www.ibm.com. Internally, an address such asheatingSystem/status.html might provide access to the status of a localsystem.In a typical Internet Web site, most of the information is static sinceit does not change until someone physically changes it. Dynamic applicationson the Web need to advance this concept by displaying rapidlychanging information in near real time. To create, transport, and view©2001 by The Fairmont Press, Inc. All rights reserved.
Building Automation, Wireless Technology and the InternetFieldbusFigure 9-1. Control, plant and corporate networks.this information, the Java language can be used.The Java applets are transported across the network and are executedon the user’s computer inside the Web browser. The user interfacelooks familiar to anyone accustomed to Web Surfing.For the applet to be effective requires that there be communicationwith the real device for the system to either monitor or control theequipment. The nature of this communication depends on the controlfunction of the equipment.Since Java and Intranets mainly support only open protocols, thisinterface is usually widely available throughout the network. One way©2001 by The Fairmont Press, Inc. All rights reserved.
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HVAC ControlIn the New Millenniumby
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Table of ContentsChapter 1Chapter 2
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The use of wireless LANs may double
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munication technologies, predict th
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ing automation. This will continue
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Computer Networks and Security 265C
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Computer Networks and SecurityInter
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Computer Networks and Securitylogic
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