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Building management system


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The system behind how multiple networks from different platforms are associated in a building or in a firm

The system behind how multiple networks from different platforms are associated in a building or in a firm

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  • 1. BUILDING MANAGEMENT SYSTEM Prepared by M.Charan
  • 2. INDEX  Introduction  Characteristics  Protocols of BMS  BAC net  Lon WORKS  Building automation  Lighting control system  Maintenance & Applications  References
  • 3. INTRODUCION  BMS is a computer based control system installed in every building.  To monitor mechanical and electrical equipment.  Consists of software and hardware.  Software program configured in a hierarchy, comprises protocols like C-Bus and Profi-Bus.  Supports internet protocols and open standards such as DeviceNet, SOAP, XML, BAC net, Lon WORKS and Mod-bus.
  • 4. CHARACTERISTICS  BMS are most commonly implemented in large projects with extensive mechanical, electrical, and plumbing systems.  Systems linked to a BMS typically represent 40% of a building's energy usage; if lighting is included, this number approaches 70%.  Improper installation causes malfunction of the system and loss of energy.  The four basic functions of a central, computer-controlled BMS are:  Controlling  Monitoring  Optimizing  Reporting
  • 5. PROTOCOLS & OPEN STANDARDS  DeviceNet • Network system used in the automation industry to interconnect control devices for data exchange.  SOAP • Exchanging structured information in the implementation of Web Services in computer networks.  XML • Defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.  BAC net • Communication protocol for building automation and control networks.  Lon WORKS • A networking platform specifically created to address the needs of control applications.  Modbus • A serial communications protocol for use with its programmable logic controllers (PLCs).
  • 6. BACnet(building automation and control networks)  BACnet was designed to allow communication of building automation and control systems for applications such as HVAC, Light control system, Access control system etc.  Provides mechanisms for computerized building automation devices to exchange information, regardless of the particular building service they perform.  Overview of this protocol is that many services that are provided or installed can communicate between building devices.  Services are used for device and object discovery.  Defines a number of Objects that are acted upon by the services.  Objects include Analog Input, Analog Output, Analog Value, Binary Input, Binary Output, Binary Value, Multi-State Input, Multi-State Output, Calendar, EventEnrollment, File, Notification-Class, Group, Loop, Program, Schedule, Command, and Device.
  • 7. LonWORKS(Local operation network)  Lon WORKS is a network platform specifically created to address the needs of control applications.  Platform is created by Echjelon corporation for networking devices over media such as twisted pair, power lines, fiber optics and RF.  Two physical layer signaling technologies are used 1)Twisted pair-free topology 2)power line carrier  The two-wire layer operates at 78 kbit/s, while the power line achieves either 5.4 or 3.6 kbit/s, depending on frequency.  LonWorks platform-based control applications are being implemented with some sort of IP integration, and accomplished with the web services and IP routing products.
  • 8. BUILDING AUTOMATION  The advanced functionality provided by the control system of a building.  The control system is a computerized, intelligent network of electronic devices designed to monitor and control the mechanical, electronics, and lighting systems in a building.  Figure depicts the whole network which is installed in a building.
  • 9. BUILDING AUTOMATION  Topology • Building automation networks consist of a primary and secondary bus which connect high-level controllers with lower-level controllers, input/output devices and a user interface. • Protocols such as Lonworks, Bacnet, ASHRAE, ZigBee. • Inputs and outputs are either analog or digital  Infrastructure • Controller • Occupancy • Lighting • Air handlers • Central plant • Alarms and security
  • 10. LIGHTING CONTROL SYSTEM  An intelligent network based lighting control solution that incorporates communication between various system inputs and outputs related to lighting control with the use of one or more central computing devices.  Lighting controls • Stand-alone control of the lighting within a space, may include occupancy sensors, relays, photocells, touch screens  Automated Control • Chronological time (time of day) • Astronomical time (sunrise/sunset) • Occupancy using occupancy sensors • Daylight availability using photocells • Alarm conditions • Program logic (combination of events)
  • 11. MAINTENANCE & APPLICATIONS  Since the system is computerized, it is easy to maintain and regulate or control.  Installation is very complex and cost effective.  Ease of information availability problem.  Computerized maintenance scheduling.  Effective use of maintenance staff.  Early detection of problems.  More satisfied occupants.  System integration.  Energy saving.
  • 12. REFERENCES        http://