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

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HVAC Control in the New Millenniummultiprocessor and cluster implementations. It also exists in a real-timeversion and has earned a reputation as a mission-critical server platform(Figure 5-4).Several vendors are prepared to support Linux. GE FanucCIMPLICITY has its UNIX experience and may support Linux as well.National Instrument’s LabVIEW is on Linux and Opto 22 support Linuxwith Linux drivers for its Ethernet and PAMUX I/O products.The Linux operating system has to reach commercial levels of successfor desktop systems in order to be fully accepted. Many serverproducts use Linux and the level of reliability and robustness needed isone of the toughest.Real-time LinuxReal-time Linux uses a real-time executive, which takes priorityover the main Linux kernel. The purpose of RT-Linux is to mix twoFigure 5-4. RT-Linux with a real-time executive that runs the mainLinux kernel as a subordinate task.©2001 by The Fairmont Press, Inc. All rights reserved.
PC-based Control, Software and Bus Trendsincompatible properties in the same operating system. One is hard realtimeservice with its predictable, fast, low latency, simple scheduler. Theother is the services of GUI, TCP/IP and web-servers.Linux is a low-cost OS with a high-performance microkernel architecture.Linux is the ultimate example of open architecture, with hundredsof thousands of end-user contributions.Object TechnologyThe trend towards open source software continues with objecttechnologies and Internet protocols making it possible. There were nostandards available for object technology back in the 1980s, so the realtimeObject Manager was developed. This type of object-based softwareand communications infrastructure provides a high degree of hardwareand operating system independence.Today, there are many industry and defacto object standards suchas Java, CORBA, OPC, Active X and DNA. Each has its place within thecomplete sensor-to-database automation solution. There has been muchsuccess in using Foxboro’s Object Manager with these industry anddefacto object standards to create object-enabled environments.Many of these applications can run on a number of operating systemsincluding Windows NT, SUN OS, Solaris, VRTX, and Venix. StandardTCP/IP networks, OpenVMS, HP-UX and AIX are also supported.Several object-oriented technologies are playing important roles incontrol software. These are OPC, ActiveX and Java. The latter two arefinding their roles primarily in networks and the Internet. CORBA andORB are also object technologies, but these are found primarily on UNIXsystems and typically work at enterprise levels. They have not seenmajor use in industrial data communications.OLE (Object Linking and Embedding) was Microsoft’s originalobject-based communications technology within Windows. OLE allowsyou to assign tasks to objects and create integrated applications that canshare data.OLE was replaced by the newer OPC (OLE for process control). Inprocess control, OLE/OPC opened up communications between devicesand software applications in the Windows environment. OPC becamethe standard technique for exchanging data between clients and servers.OPC toolkits from companies such as PC Soft extended the technology©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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Heat, Ventilation and Damper Contro
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Advanced HVAC Control, Information
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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 Securitystruc
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Computer Networks and SecurityA bro
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Computer Networks and SecurityThinn
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Computer Networks and Securityther
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Computer Networks and Securitywork.
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Computer Networks and Securitylogic
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Computer Networks and Securitythey
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Computer Networks and Securitywork
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Computer Networks and SecurityMany
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Computer Networks and SecurityPure
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Computer Networks and SecurityThe m
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Computer Networks and Securityavail
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Computer Networks and SecuritySever
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Computer Networks and SecurityEffic
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Computer Networks and Security 305C
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Computer Networks and Security(CAD)
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Computer Networks and Securityand f
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Computer Networks and Securitymost
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Computer Networks and Securityconne
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Computer Networks and SecurityLonMa
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Computer Networks and SecurityIn De
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Computer Networks and SecurityContr
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Computer Networks and SecurityThe C
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Computer Networks and SecurityMODBU
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Computer Networks and SecurityFigur
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Computer Networks and SecurityGatew
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Computer Networks and Securitytion
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Building Automation, Wireless Techn
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Table 9-4. Internet Services——
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