Protocols of BMS
Lighting control system
Maintenance & Applications
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
Supports internet protocols and open standards such as DeviceNet, SOAP,
XML, BAC net, Lon WORKS and Mod-bus.
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:
PROTOCOLS & OPEN STANDARDS
Network system used in the automation industry to interconnect control devices for data exchange.
Exchanging structured information in the implementation of Web Services in computer networks.
Defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.
Communication protocol for building automation and control networks.
A networking platform specifically created to address the needs of control applications.
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,
LonWORKS(Local operation network)
Lon WORKS is a network platform specifically created to address the needs of
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
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 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
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.
Stand-alone control of the lighting within a space, may include occupancy
sensors, relays, photocells, touch screens
Chronological time (time of day)
Astronomical time (sunrise/sunset)
Occupancy using occupancy sensors
Daylight availability using photocells
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.