bacne tvs lon works
TRANSCRIPT
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Current Direction of Building Automation
BACnet
Lonworks
World View
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An Overview of...
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An Overview of...
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An Introduction - What is BACnet?
Acronym for Building Automation and Control Network Protocol
Allows different systems to operate in a
coherent automation & control systemInternationally recognized standard since1995 (NIST, CEN)
Open data communications protocol: standardmeans of communicating between computers and devices and
share data regardless of the equipment manufacturer
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The Protocol - Basic Elements
BACnet Architecture
Object Properties
BACnet Services
BACnet Media
BACnet Devices
BACnet Objects
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The Protocol - Network Media Types
Peer-to-peer CSMA/CD LAN operating at10 Mbps or 100 MbpsThin-wire (10Base2)
Thick-wire (10Base5) coax cableTwisted pair (10BaseT)Fiber optics (10BaseF)
Ethernet
Peet-to-peer token-passing LAN typicallyoperating at 2.5 MbpsCoax cableTwisted pair
Fiberoptic cable.
ARCnet
Physical connections between BACnetdevices for transfer of BACnet messages
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The Protocol - Media Types
EIA-485 LAN which can operate at 9600,19.2 K, 38.4 K, and 76.8 K bps.
Master devices are peer devices that passa token.Slave devices co-exist on the same wire
but can only respond to Master devices.
MS/TP
EIA-232 protocol that provides serialcommunications between two BACnet
devices, connected continuously or viadial-up modem.
PTP
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The Protocol - Media Types
Based on Neuron Chip developed byEchelon with transceiver operating at 78
KBaud or 1.2 MBaudTwisted pairPower line carrierWireless connections
LonTalk
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The Protocol - BACnet Objects
Data model for BACnet devices:
Analog Output
Analog Value
Analog Input
Binary Input
Binary Output
Binary Value
Calendar
Command
Event Enrollment
File
Group
Device
Loop
Multi-State Input
Multi-State Value
Multi-State Output
Notification Class
Program
Schedule
Trend log (new)
Proprietary
Objects
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The Protocol - BACnet Services
How a BACnetdevice obtains, commands and acknowledgesinformation from one device to another device.
BACnetdefines 32 services, classified into 5 categories
Alarm and Events File Access
Object Access Remote DeviceManagement
VirtualTerminal
Acknowledge Alarm AtomicRead File
Add ListElement
DeviceCommunicationControl
VT-Open
Confirmed Change of ValueNotification
AtomicWrite File
Remove ListElement
ConfirmedPrivate Transfer
VT-Close
ConfirmedEvent Notification
Create Object UnconfirmedPrivate Transfer
VT-Data
Get AlarmSummary
Delete Object Re initialiseDevice
Get EnrolmentSummary
Read Property Confirmed TextMessage
Subscribe COV Read PropertyConditional
TimeSynchronisation
UnconfirmedChange of Value Notification
Read PropertyMultiple
Who-Has
Write Property Who-IsWrite PropertyMultiple
I-Am
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The Protocol - Combined Elements
Existing Definitions
Functional groups
Conformance classes
New Definitions
BACnet Interoperable Building Blocks
Functional profiles
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TRENDING- A TRENDING- B
ALAR
MING-A
ALARM
ING-B
DATASHARING-A DATASHARING-B SCHEDU
LING-A
SCHEDU
LING-B
NETWORKMGMT-A NETWORKMGMT-B
BACnet Interoperable Building Blocks
Data Sharing
Alarm & Event Management
Time Scheduling
Trending-150
-100
-50
0
50
100
150
BIBBs
Device and Network Management
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The Protocol - PICS
PROTOCOL
IMPLEMENTATION
CONFORMANCE
STATEMENTS
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Operator Workstation
Building Controller Advanced Application Controller
Application Specific Controller
Smart Sensor / Actuator
BACnet Device Profiles
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An Introduction - What BACnet doesnt
provide ...
Device Set-up/ConfigurationCommon programming language
Operator Look & Feel
Total Plug & Play connectivity
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Lonworks - what is it?
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Lon mark Heat Pump Controller
Space Temperature
Setpoint from network
Actual Space Temp Used
Current status of unit
HVAC Mode command from
network
Network occupancy statusOccupancy status
Setpoint offset
Auxiliary heat enable
Setpoint currently being
used
Space Tempnv1
SetPointnv2
S aceTemnv3
UnitStatusnv4
EffectSetPtnv10A licModenv5
OccCmdnv6
Occu Swnv7
SetPtOffsetnv8
AuxHeatnv9
nc60 Temperature Setpoint (mandatory)
nc49 Send Heartbeat
nc17 Location (optional)nc48 Maximum Receive Time (optional)
Manufacturer
Defined
Section
Configuration Properties
Optional
Network
Variables
Mandatory
Network
Variables
Heat Pump
Hardware
Output
Hardware
Input
Figure 1.2 Heat Pump with Temperature Object Details
H d
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Lon mark Fan Coil Controller
Space Temperature
Setpoint from network
Heat valve status
Cool valve status
Fan speed statusFan speed control
HVAC mode - heat/cool
Setpoint offset
Supply water temperature
Energy demand
Power consumption
Supply air temperatureReheat stage status
Space temperature status
Actual setpoint used
S ace Temnv1
SetPointnv2
HeatOutputnv3
CoolOutputnv4
FanSpeednv5
TerminalLoadnv11
LoadAbsnv12
DischAirTempnv13
Reheatnv14
SpaceTempnv15
EffectSetPtnv16
FanS eedCmdnv6
OccCmdnv7
ApplicModenv8
SetPtOffsetnv9
WaterTempnv10
DischAirTemnv17
EnergyHoldOffnv18 OccCmdnv19
EnergyHoldOffnv20
UnitStatusnv21
nc49 Send Heartbeat (mandatory)
nc48 Maximum Receive Time (optional)
nc60 Occupancy Temperature Setpoints (mandatory)
nc52 Minimum Send Time (optional)
nc17 Location (optional)
nc59 Number of Out ut Valves (o tional)
Manufacturer
Defined
Section
Configuration Properties
Optional
Network
Variables
MandatoryNetwork
Variables
Fancoil Unit Controller
Object: 8020
Hardware
Output
Hardware
Input
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How does Lonworks operate
Operator Work Station
Fan System controller
VAV Box controller
- Fan control and status
- Mixed air damper control
- Supply air control ofheating coil
- Morning warm up andnight setback
- Fan control and status
- Occupancy activation
- Warm up mode - max heat
- Standby mode - no flow- Temperature setpoints
- Weekly schedules
- Annual Schedules
- Optimal start routine - Custom programming - Graphical interface
- User security
- Totalizers
- Trend logs
- Alarms
- VAV demand resets SAT
- Summer operation, boilers off
- Teacher enters front door
Scheduler
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Connecting Lonworks - Binding
Fan System controller
Operator Work Station
VAV Box controller
- Fan control and status
- Mixed air damper control
- Supply air control ofheating coil
- Morning warm up andnight setback
- Fan control and status
- Occupancy activation
- Warm up mode - max heat
- Standby mode - no flow- Temperature setpoints
- Weekly schedules
- Annual Schedules
- Optimal start routine - Custom programming - Graphical interface
- User security
- Totalizers
- Trend logs
- Alarms
- VAV demand resets SAT
- Summer operation, boilers off
- Teacher enters front door
Scheduler
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Connecting Lonworks - Network Management
Operator Work Station
Fan System controller
VAV Box controller
- Fan control and status
- Mixed air damper control
- Supply air control ofheating coil
- Morning warm up andnight setback
- Fan control and status
- Occupancy activation
- Warm up mode - max heat
- Standby mode - no flow- Temperature setpoints
- Weekly schedules
- Annual Schedules
- Optimal start routine - Custom programming - Graphical interface
- User security
- Totalizers
- Trend logs
- Alarms
- VAV demand resets SAT
- Summer operation, boilers off
- Teacher enters front door
SchedulerNetwork Database- Binding Backups
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Lonworks and BACnet
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Myths about Lonworks and BACnet
Only one standard will be left standing
They work together in harmony
One is expensive, the other isnt
One is simple, the other is complicated
Specifying is a nightmare
BACnet and Lonworks were designed for specific
applicationsTesting and certification is complete/missing
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Myths about Lonworks and BACnet
Only one standard will be left standing
Both Lon works and BACnet have different
strengths and weaknesses Control manufactures are designing hybrid product
lines
Products are not mutually exclusive
BACnet is a vendor and hardware independent
communication protocol available to everyone.
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Myths about Lonworks and BACnet
They work together in harmony
Some manufactures want their side to win and direct
ads and hype accordinglySome manufactures have incorporated the
communication technology for marketing reasons
Must realize that both groups have to work together
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Myths about Lonworks and BACnet
One is expensive, the other isnt
What story do you want to hear today
At the end device level, vav box or fan systemcontroller, this varies depending on the size of the
application and media type chosen
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Myths about Lonworks and BACnet
One is simple, the other in complicated
They are both very complicated - if you are a
technician required to understand the inner workingsThey are both simple if you are an operator running
a system
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Myths about Lonworks and BACnet
Specifying is a nightmare
Depends on which control manufactures you use
Specialized Lonworks systems integrators writingdivision 13000 or 17000 indicate that this requires a
high degree of expertise.
BACnet specifying can be a similar experience
Specifying DDC system shall be BACnet/Lonworks
will not be adequate
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Myths about Lonworks and BACnet
BACnet or Lonworks was designed for a specific application
BACnet was designed to connect 2 different
proprietary systems together NOT for buildingcontrols
May have been the intent when Cornell university
instigated the process 12+ years ago
Lonworks was designed for the transportation
industry Now it is used in military, aircraft, general industrial
and HVAC industry
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Myths about Lonworks and BACnet
Testing, Certification, Verification is complete/missing
The Lon mark designation indicates that the product has been
certified to meet the protocol standards
Lon mark is not a standards body but a group of gold levelmembers
Landmarks provides certification but not verification
BACnet is just implementing testing/certification process BACnet manufactures association (BMA) and BACnet testing
laboratory (BTL)
Test qualification program underway and scheduled to completeend of 2001
Full verification
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What are some of the real differences
Lonworks BACnet
Proprietary protocol built into a chip
set
Originated from transportation
industry, Echelon Corporation
Protocol in use in many industrial
type applications thus is relatively
genericDevice level protocol - determines
set of characteristics, inputs, outputs,
setpoints, for each type of device
Processor limits to Neuron chip
small applications
separate processor required for
larger applications
Consensus developed standard
protocol
Initiated by Cornell University,
owner driven
Protocol optimised for the building
automation industry
Functional view point of protocol -
objects and services
Object model protocol
Standard network chip for
Ethernet/ARCnet
RS485 (MS/TP) can have
application imbedded with network
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What are some of the real differences
Lonworks BACnet
Network communication speeds of
78,000 to 1.5 mbaud Lontalk
Network packet sizing of 256 bytes
Non deterministic network
Multiple networks topologies
include Ethernet, ARCnet, RS485
(MS/TP), RS232 (PTP), Lontalk
Speeds vary from 10 mbaud down
to 9600 baud.
Network packet sizing from 30
bytes to 1500 bytes at EthernetNon deterministic network -
Ethernet
Deterministic network - ARCnet,
MS/TP
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What are some of the real differences
Lonworks BACnet
Network manager per island of
control, only one master
Priority level of control is limited to
predefined profiles
User implemented
Pricing varies depending if the
application required can be supported
directly by the Neuron chip. If not a
second processor must be added.
Only manufactured by limited set of
companies
There is no master controller,
system architectures vary in
degrees of distributed control. Not a
BACnet limitation
16 levels of priority from Manual
life safety, operator commands,
general control languages etc.Defined by Ashrae
MS/TP is very inexpensive and
doesnt require a second processor
Ethernet and ARCnet have
separate network chips thus more
expensive
Standard chips mean mass
production
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Whats the World Doing?
The importance of Europe is being proven again in the field ofbuilding automation controls. Think who owns, controls, and runs
a number of US control firms
The European Committee for Standardization, CEN, has beendrawing up standards for the Heating, Cooling and Ventilation
industry under technical committee TC247
They created a three level hierarchical model calledmanagement, automation, and field
Management level - communications, monitoring, alarms,
trends, energy management, links to non-HVAC systemsAutomation level - majority of real-time functions are executed
Field level - unitary or application specific controllers
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European protocol standards for building automation
Level Protocol Description
Management FND (DIN V 32735) German (Govt) firm neutral
BACnet
Automation PROFIBUS Process field bus
WorldFIP Factory instrumentation
BACnet
Field Batibus French
EHS European home systemEIB European installation bus
Lontalk
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International Organization for Standardization - ISO
Working group 3 of ISO committee TC205, Building
Environment Design, recently adopted BACnet as its
working draft for building control protocolLooking to resolve differences in the way BACnet
should be used over the internet
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Application Areas for Sensor/Control/Data Networks
Data processing and networks
Ethernet
Building
DeviceNet
Fieldbus
LonWorks
BACnet
Sensor
Zone
Profibus