Building management system

BUILDING MANAGEMENT
SYSTEM
Prepared by
M.Charan

INDEX
 Introduction
 Characteristics
 Protocols of BMS
 BAC net

 Lon WORKS
 Building automation
 Lighting control system
 Maintenance & Applications
 References

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.

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

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).

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.

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.

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.

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

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)

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.

REFERENCES
 http://en.wikipedia.org/wiki/Building_management_system
 http://en.wikipedia.org/wiki/Lighting_control_system
 http://www.facilitiesnet.com/lighting/tip/Lighting-Systems-SixMaintenance-Tips--21421#
 http://en.wikipedia.org/wiki/Building_automation
 http://en.wikipedia.org/wiki/LonWorks
 http://en.wikipedia.org/wiki/BACnet
 http:// en.wikipedia.org/wiki/Modbus

Building management system

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