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

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HVAC Control in the New MillenniumFigure 8-1. Network hierarchy.control devices including PCs and distributed control systems (DCSs)(Figure 8-2). It is used at the level directly below fieldbus and devicelevelnetwork systems. It transmits control and device data, configuresthe system architecture, powers the devices, and monitors thenetwork.AS-i can be used for upgrading HVAC systems. Parallel controlwiring can be replaced with a simple AS-i cable (Figure 8-3). Mostconventional wiring system can be replaced and users report wiringsavings of up to 40%.Conformance to the AS-i standard assures interoperability. Eachslave that fulfills the standard’s requirements can work together withany other slave in the network.The network uses a common cabling system with all peripheraldevices connected to the AS-i cable. The AS-i protocol is embedded inthe slave chip which connects the sensors and actuators to the cable.AS-i uses one master per network that calls up all the connectedslaves with a cyclic polling that uses their address. The AS-i datapackets are short with simple structures and have a fixed length.Four usable data bits are exchanged between a master and every in-©2001 by The Fairmont Press, Inc. All rights reserved.
Computer Networks and SecurityFigure 8-2. Cabling with AS-i serial interface.Figure 8-3. Parallel wiring cabling.©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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HVAC Control in the New Millenniumt
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Heat, Ventilation and Damper Contro
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Control Technology, Microelectronic
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Advanced HVAC Control, Information
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Computer Networks and Security 265C
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Computer Networks and SecurityInter
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Computer Networks and SecurityNetwo
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Computer Networks and SecurityEther
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Computer Networks and SecurityEther
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Building Automation, Wireless Techn
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