bacnet 101 - cdn.ymaws.com · miscellaneous bacnet benefits it can be implemented on low-cost...
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BACnet 101
Ben H. Dorsey III BACnet International Marketing Committee
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Our Agenda What is BACnet? The Business Case/Value Proposition Working with BACnet The Future of BACnet Success Story (if time permits)
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Part 1 What is BACnet?
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What is BACnet?
An open standard A data communications protocol An acronym: Building Automation and Control Networks A means of automating buildings and integrating building systems A registered trademark of ASHRAE!
®
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So . . .
BACnet is a data communications protocol and an agreed-upon set of rules for creating interoperable networks of building systems.
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Encompassing . . .
HVAC equipment and terminal units Lighting systems Access systems Security and CCTV Life safety Renewable energy sources Windows and shading
Parking facilities Irrigation Smoke control doors &
dampers Mass notification Elevators Emergency power
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Who Created BACnet?
A working group (standard project committee) of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). Began work in 1987 under tremendous opposition (some
said it would NEVER be done). Published as a standard in 1995. Supported and maintained by ASHRAE Standing Standard
Project Committee (SSPC) 135.
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It’s Alive!
By design, the standard is under continual revision. It’s also an ANSI and ISO standard
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Some BACnet Terminology
Objects oThe standard uses an object-oriented model to
represent information. oDefines more than 50 standard objects oManufacturers can create non-standard objects
Product manufacturers combine objects to create Devices
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Some BACnet Terminology Services oStandard also built on an application services
model oThink of services as the messages that BACnet devices
send to each other. oSome services read and write properties of one or more
objects. oOther services send notification of alarms or special
events. oStill other services read and write files.
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Some BACnet Terminology
Services oAgain, implementers can pick and choose which services
to incorporate into Device functionality oGrouped into
• Object access • Alarm and event management • Scheduling • Trending • Files • Device and network management
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Some BACnet Terminology
Devices (or Device Profiles) oDefined by Objects and Services supported
oOperator Workstations (B-AWS, B-OWS, B-OD)
oControllers (B-BC, B-AAC, B-ASC, B-SS, B-SA)
oMiscellaneous (B-RTR, B-GW, B-BBMD, B-GEN)
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What the Standard Defines
In essence, the standard defines the messages that devices exchange and how they are delivered.
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message transport
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Common Transport Options
BACnet/IP
MS/TP
COST
SPEED
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Miscellaneous BACnet Benefits
It can be implemented on low-cost networks (dedicated or shared) and is extremely flexible in LAN types. BACnet devices are cost-competitive with long-standing
proprietary devices. The standard specifically provides for scheduling, trending, and
alarming. It is easily scalable at all levels for any size job. It is completely open and not dependent on specific hardware. It provides for automatic device discovery (saving installation
costs).
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What BACnet Isn’t
BACnet is not “plug-n-play.” BACnet does not replace the need for DDC or control logic
and does not attempt to standardize how devices are programmed. BACnet does not replace the need for specifying what a
user wants or needs. (It simply provides some standardized tools to help enable the creation and specification of systems that can interoperate.)
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Part 2 The Business Case
and Value Proposition
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It’s Open
As digital communications emerged in the controls space, company-specific (or proprietary) languages were developed by manufacturers. They worked and worked
well. They just didn’t play well with others.
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Proprietary BAS from Building Owner Perspective Consider the hiring challenge of trying to find
qualified operators and technicians. oThose familiar with Brand X may be in short supply. oMeanwhile the best candidates may be familiar with
Brand Y and Brand Z but have no experience on X. oAnd when the external service provider is the only
game in town, I can be held hostage. oHow long will I tolerate that?
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A proprietary system joins me at the hip to a single product manufacturer and, perhaps, a single manufacturer’s representative. If my control strategy needs to
change in light of building dynamics, will I receive the necessary responsiveness?
Proprietary BAS from Building Owner Perspective
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Today’s automation systems have to play well in the entire enterprise. Less and less are they standalone entities controlling
your mechanical systems, for example. Integration of systems is becoming more necessary due
to increased efficiency and the need to have accurate data across the enterprise. Frequently, enterprise systems or energy management
add-ons, such as dashboards, will want to pull data from the BAS. When the communication protocol is proprietary, the
sharing of such data becomes problematic.
Other Proprietary BAS Issues
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Proprietary BAS Life Cycle Issue “After seven years, BAS become
very difficult to support and with proprietary based control networks, can be made to be functionally obsolete by being incompatible with the next generation product lines.”
--Raed Salem, Director of MEP Engineering for Chicago AE firm,
Larson and Darby Group
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But BACnet is Open
Choice of Providers: oASHRAE issues vendor identification numbers to
companies choosing to develop BACnet products. oThe total number of vendor IDs surpassed 800 by
the beginning of 2015; now exceeds 950! oThat means there are more than 950 businesses
out there developing products that can interoperate.
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It’s Interoperable
Device-to-device compatibility oSpeak the same language oHave the same interests oGo to the same places oHave matching sweaters
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It’s BACward Compatible
While BACnet, as a standard, is under continuous development, its very nature is one of backwards compatibility. A controller of a generation 1 will continue to perform its
assigned functions even as controllers of generation 2 are added to the network or as software of generation 2 assumes network management. The same is true for generation 1 of Brand X and
generation 2 of Brand Y.
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Seven Year Replacement? Raed Salem continues: “This issue is dependent on
whether the existing system is based on an open control network standard or is a vendor proprietary control network. A worst case scenario would be for the proprietary control network requiring complete replacement (100 percent) and a best case scenario would be no system replacement with the open standards based control network (because of existing system compatibility with the next generation BAS components).”
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It’s Enterprise Ready
BACnet is an integration engine. oSystems are often interrelated oConsider building access and
occupancy-based lighting and HVAC oSynergies can be realized such as
the learning of one user interface versus several
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Encompassing . . .
HVAC equipment and terminal units Lighting systems Access systems Security and CCTV Life safety Renewable energy sources Windows and shading
Parking facilities Irrigation Smoke control doors &
dampers Mass notification Elevators Emergency power
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Part 3 Working with BACnet
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Seeing Specs
Contractors/Service Providers o“The Controls Contractor shall supply and install a
complete Building Automation System (BAS) as required to accomplish . . .”
o“Building Automation System (BAS) shall consist of native BACnet . . .”
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Native BACnet?
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What to Look For
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Where to Find BTL Listed Products
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Remember: It’s Not Plug-n-Play
The standard does not stipulate how devices are to be configured or programmed. That means that each manufacturer can have its own
programming tool. Can still be brought under a single operator workstation or
user interface. Mapping points from one brand of devices to another can
be tedious.
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Another Potential “Gotcha”
BACnet standard provides for manufacturers to implement their own special capabilities through the use of proprietary objects & properties. Some better than others at using standard data types to
promote interoperability. Sometimes, so much proprietary activity going on that true
interoperability is thwarted.
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Don’t Forget the Training!
Major controls manufacturers provide training to contracting partners. Especially important for technicians.
And, for in-house facility professionals,
consider the extent to which you want to be trained: oChanging schedules oModifying or adding graphics oEtc.
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Some Helpful Diagnostic Tools
Device logs, file captures, history reports oTrends and logs provide information for further
optimization of the system as well as for documentation requirements for building certification.
BACnet network browsers Communication wire captures
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Part 4 The Future of BACnet
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Building Intelligence
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Automation
Hardware and software for monitoring and controlling various building systems. The low-hanging fruit of building
intelligence.
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Automation—What’s Next?
IoBT, the Internet of Building Things oDevice to enterprise connectivity through IP and wireless oSensors, sensors, sensors oMeters, meters, meters oMobile apps
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Integration
Bringing together automated systems. oTypically through a common user interface oAlso through supervisory control devices
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Integration—What’s Next?
IoBT, the Internet of Building Things oData, Data, Data oMore measurement & verification oCyber threats and cyber protection oA new generation of IT-savvy system integrators
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D A & V—What is it?
A means of visualizing and interpreting all of that data
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D A & V—Why do it?
It’s trendy! “The use of data analytics or predictive
analytics allows organisations to efficiently extract, clean and standardise data from multiple operational and legacy systems, as well as data in the public domain, to deliver real insights to business stakeholders.” (Deloitte)
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D A & V—What does it looks like?
Starts with attractive graphical representation of building systems and operating parameters. Moves on to dashboards. Culminates in intelligent analysis;
portending options or recommending courses of action.
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D A & V—What does it looks like?
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D A & V—What’s Next?
IoBT, the Internet of Building Things oTruly actionable analytics oCustomized and customizable views oThe cloud oStrange bedfellows
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BACnet is Keeping Pace
SSPC 135 Working Groups drive continuous development of the standard oWorking Groups include Information Technology,
Network Security, and Smart Grid, and Data Modeling, among others
Product Manufacturers & Developers oJust visit the building automation and
controls showcase here at the show.
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Part 5 A Success Story
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Success Story TDK Headway Technologies oMarket: Technology Manufacturing oOwner: TDK Corporation oLocation: Silicon Valley oBuilding Size: 115,000 ft2 oProject Type: Energy Retrofit
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Success Story Their Business: oManufactures aluminum titanium carbide wafers
consisting of thousands of read/write heads used in computer hard drives. oTDK sales of such devices account for about 1/3 of all
such sales worldwide. oISO-14001 registered quality
system and Class 100 clean room manufacturing
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Success Story The Situation oCorporate mandate of continuous improvement oAnnual energy-use reduction goals but dictated by
fabrication requirements oLocation costs challenge them to be ultra-competitive in
a worldwide arena oHad achieved year-over-year energy reduction goals for
5 previous years oBUT, had done so through low-hanging fruit
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Success Story
The Challenge oAchieve 10% energy reduction goal oWITHOUT disrupting the fabrication (24/7/365 operation) oMaintain environment at 68° +/- 1 degree and 45% RH +/- 2.5%
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Success Story The Solution oDeep energy audit oSystem-level thinking oFrom conditioning 100% of air to conditioning
supply and make-up air (sensors and BACnet controls) oFor water usage (chilled, hot, steam), all requiring
gas, added VFDs, staged cycle usage, sensors and BACnet control to maintain only required pipe pressures
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Success Story The Results oROI in 10 months! oElectricity: 5.4 to 4.4 megawatts continuous demand
($800K savings) oGas: of 10 boilers in operation before, only 5 in
operation now oPG&E rebate check: $633,500 oMayoral recognition for CO2 reduction
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