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BACnet 101an introduction to BACnet
Edward TomProduct ManagerYaskawa America, Inc.
DISCLAIMER: The views and opinions expressed in this presentation are those of the speaker and do not necessarily represent official policy or position of BACnet International.
ObjectivesFollowing the presentation, you will be able to…
• Explain the purpose of the BACnet protocol
• List five benefits of the BACnet protocol
• List five uses of the BACnet protocol
Our Agenda• What is BACnet®?
• Why BACnet®?
• How does BACnet work?
• What else do you need to know?
What is BACnet?
What is BACnet?
Building Automation and Control Network• Open communication protocol
• Protocol = Rules or procedure• Communication = Method of exchanging
information• Open = Available to everyone
Why BACnet?
Why BACnet?
你好!
こんにち!
Hello!
¡Hola!
Why BACnet?• BACnet was a solution to a problem
• Lack of interoperability• Closed, proprietary protocols• Lack of scalability
Key Objectives1987 – Development started by ASHRAE Standards Project Committee • Open• Interoperable• Simplified Integration• Scalability• Backwards Compatibility• Interchangeable
Road to be a Standard• 1987 – Development started by
ASHRAE Standards Project Committee
• 1995 – Published as ANSI/ASHRAE Standard 135
• 2003 – Became an ISO standard
Today
• Supported and maintained by ASHRAE SSPC-135
• Open and balanced process
BACnet Adoption
194248
369445
612686
824
919
2011 2012 2013 2014 2015 2016 2017 2018
Total Listings
Total Listings
BACnet Adoption
Source BSRIA, Inc.
Market Share
How Does BACnet Work?
Interoperable
Interoperable
Simplified Integration• Device Profiles
• B-OD, B-OWS, B-AWS (BACnet Operator Workstations)
• B-BC (BACnet Building Controller)• B-AAC (BACnet Advanced Application Controller)• B-ASC (BACnet Application Specific Controller)• B-SS (BACnet Smart Sensor)• B-SA (BACnet Smart Actuator)
BACnet Device
Simplified Integration• Objects
• Use of object-oriented model to represent information
• Defines more than 50 standard objects• Manufacturers can create non-standard objects• Examples:
• Analog Input, Analog Output, Analog Value, Binary Input, Binary Output, Binary Value, Schedule, etc.
BACnet Device
BACnetObject
BACnetObject
BACnetObject
BACnetObject
BACnetObject
Simplified Integration• Properties
• Attributes of an object• Two pieces
• Identifier• Value
• Example:• Sensor signal level
BACnet Device
BACnetObject
BACnetObject
BACnetObject
BACnetObject
BACnetObject
BACnet Object = Analog OutputProperty Identifier = Sensor levelProerty Value = 10 mA
Simplified Integration• Services
• Action that an object can perform or be requested to perform
• Example:• ReadProperty
Boiler/ChillerController
Are you running?
Yes I am.
Scalability
Air Flow Station
Lighting PlantController
RoomController OCC Sensor
Daylight Sensor
Room SwitchScene Device
Boiler/ChillerController
VFD 1
VFD 2
Boiler 1
Boiler 3
Boiler 2
Static PressureBack Status Sensor
Damper
ValueAHU Hardwired Points Panel
AHU VFD
Common Transport Options
BACnet/IP
MS/TP
COST
SPEED
Backwards Compatibility
Air Flow Station
Lighting PlantController
RoomController OCC Sensor
Daylight Sensor
Room SwitchScene Device
Boiler/ChillerController
VFD 1
VFD 2
Boiler 1
Boiler 3
Boiler 2
Static PressureBack Status Sensor
Damper
ValueAHU Hardwired Points Panel
AHU VFD
NEWVFD 2
Interchangeable
Air Flow Station
Lighting PlantController
RoomController OCC Sensor
Daylight Sensor
Room SwitchScene Device
Boiler/ChillerController
VFD 1
VENDOR A
Boiler 1
Boiler 3
Boiler 2
Static PressureBack Status Sensor
Damper
ValueAHU Hardwired Points Panel
AHU VFD
VENDORB
What else?
Misconceptions• BACnet is “plug-n-play.”
• BACnet limits the manufacturer’s use of innovative control logic.
• BACnet attempts to standardize how devices are programmed.
• BACnet defines the hardware platform.
• BACnet replaces the need to specify user system/device requirements.
FALSE
FALSE
FALSE
FALSE
FALSE
What to Look For…
Where to Find BTL Listed Products
www.bacnetlabs.org
Plug FestIndustry Participation in Interoperability Testing• Annual
• Vendor neutral
• Safe (confidentiality)
• Voluntary
WHAT YOU HAVE LEARNED• The purpose of the BACnet protocol
• The benefits of the BACnet protocol
• The uses of the BACnet protocol
Thank You.
Learn more at…www.thebacnetinstitute.org
