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BACnet:An Overview

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Why BACnet?

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Integrated Network Systems

General Overview Campus Network Today

General Overview Campus Network Today

Campus LANCampus LAN

CampusPolice

ACShop

Engineering

PhysicalPlant

Building Management SupplierBuilding Management SupplierSoftwareSoftware

Bldg. 1

AccessControl

Gateways

FireAlarm

Security

Building Building Management SupplierManagement Supplier

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Open Network Topology

General Overview Future Campus Network

General Overview Future Campus Network

Campus LANCampus LAN

CampusPolice

ACShop

Engineering

PhysicalPlant

Bldg. 1

HVACLightingSecurityAccessFire Alarm

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Economical Reasons

Different manufacturers;

Single system head-end, multi-access;

Well defined system responsibilities;

Reduced manpower;

Training;

Use of existing network infrastructure.

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Technical ReasonsSensor reuse

Heat;

Lighting.

Smoke Control System Equipment (UUKL) data passing.

Coordination of all control systems

Alarm resolution;

Report generation;

Multi-sensor correlation.

Flexible system design.

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Integrated Network Systems

FIREPanel

SecurityPanel

FIRE PanelControl Panel

FIRE Panel

Control Panel

Vertical LiftPanel

Control Panel

LightingPanel

Control Panel

HVACPanel

UUKL Panel

UUKLPanel

Control Panel

HVACPanel

FIREPanel

LAN

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Desired View - Global Access

Sin

gle

Bui

ldin

g L

evel

Cam

pus

Lev

el

Wor

ld L

evel

CampusNetwork

World Net

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Fire Control Stays Local

4100

4100

FCP

4020

PUSH

ALARMFIRE

PULL DOWN

4002

MAPNET

4120 Network

4020

4100

Control

Campus

Control

Control

Control

WAN

40204020

40204020

4020

4020

4020

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Background

Typical applications: HVAC controls; Lighting controls; Security (access control); Fire detection systems; Fire suppression systems; Elevators; Other control equipment and systems.

Future is virtually limitless.

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Bacnet Application Concepts

Facilitate the use of digital control technology. Defined data protocols; Application services.

Abstract object oriented information: Input & output values (Binary, Analog, Multi-stage); Text string values; Schedule information; Alarm & event information; Files; Control logic.

Object -- access to information without knowing details.

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Building Automation Control BACnet

Applications Layer

Presentation Layer

Session Layer

Transport layer

Network Layer

data link layer

7

6

5

4

3

21 Physical Layer

BACnet is a loosely coupled protocol allowing for greaterflexibility in the data link layer -- though well defined in the network and application layer for information interoperability

BACnet Layers

BACnet Application Layer

BACnet Network Layer

ISO 8802-2 (IEEE 802.2)Type 1

ISO 8802-3 (IEEE 802.3)

ARCNETEIA-485 EIA-232

MS/TP PTP

OSI Basic Reference Model

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BACnet Application Protocol

Data Representation

Objects.

Application Services

Ways to access the data.

Network Services

Methods to have access to devices on the network.

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Binary Input Object PROPERTY BACnet EXAMPLE Object_Identifier Required (Binary Input, Instance 1) Object_Name Required "MAPNET point M1-35" Object_Type Required BINARY_INPUT Present_Value Required ACTIVE Description Optional “First Floor ZAM" Device_Type Optional “ABC Pressure Switch" Status_Flags Required {TRUE,FALSE,FALSE,FALSE} Event_State Required OFFNORMAL Reliability Optional NO_FAULT_DETECTED Out_Of_Service Required FALSE Polarity Required NORMAL Inactive_Text Optional “Static Pressure OK” Active_Text Optional “High Pressure Alarm” Change_Of_State_Time Optional (23-MAR-1995, 19:01:34.0) Change_Of_State_Count Optional 134 Time_Of_State_Count_Reset Optional (1-JAN-1995, 00:00:00.0) Elapsed_Active_Time Optional 401 Time_Of_Active_Time_Reset Optional (1-JAN-1995, 00:00:00.0) Time_Delay Optional 10 Notification_Class Optional 3 Alarm_Value Optional ACTIVE Event_Enable Optional {TRUE,FALSE,TRUE} Acked_Transitions Optional {FALSE,TRUE,TRUE} Notify_Type Optional ALARM

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BACnet ServicesAlarm & Event 13

Ack Alarm C

Conf COV Notification C

Conf Event Notification C

Get Alarm Summary C

Gen Enrollment Sum C

Subscribe COV C

Unconfirm COV Not U

Object Access 15 Add List Elem C

Remove List Element C

Create Obj C

Delete Obj C

Read Prop C

Read Prop Cond C

read Prop Multiple C

Write Prop C

Write Prop Multiple C

File Access 14

Atomic Read File C Atomic Write File C

Remote Device MGT 16 Device Comm Control C Confirm Private Transfer C unconfirmed Private Transfer U Conf Text Msg C UnConf Text Msg U Time Synch U Who-Has U I-Have U Who-IS U I-am U

Virtual Terminal 17 VT Open C VT Close C VT Data C

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BACnet Functional GroupsFUNCTION GROUP DESCRIPTION

Clock Capabilities generally associated with having a clock.

Hand-held Workstation Hand-held or portable workstation capabilities.

Personal Computer Workstation Main operator workstation capabilities.

Event Initiation Detect and generate alarms and events.

Event Response Ability to respond to alarms and events.

COV Event Initiation Ability to initiate change-of-value notifications.

COV Event Response Subscribe to and receive change-of-value notifications.

Files Capability to read, write, upload and download files.

Reinitialize Ability to be reinitialized from remote device.

Virtual Operator Capable of providing operator side of virtual terminal session.

Virtual Terminal Capable of providing server side of virtual terminal session.

Device Communications Device Communication Control Service request execution supported.

Time Master Able to initiate Time Synchronization Service request.

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BACnet Protocol

CloudCloud

BACnet

LonTalk

ControlStatus

ArcnetEthernet

RS485232

232

Phone Network

CPP

BACnet Net Virtual layer

HDLC, etc.

Set host

4120 DL

EQB, RQB

RS485

4120 NM

4120

RS485

MasterSlaveTokenPassing

UDP port - X’BAC0’

SLIP, PPP

IP

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Data Link Transport Formats

ISO 8802-3 (IEEE 802.3) or Ethernet.

ANSI/ATA 878.1 or ARCNET.

Master Slave/Token Passing or MS/TP.

Point-to-Point or PTP.

LonTalk - proprietary technology developed by the Echelon Corporation.

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Ethernet

Pros Internat’l standard.

Exists in most bldgs.

Ease of interface to PC’s.

No develop. tools.

Very fast comm. (10 to 100Mbps).

Transport media (unshielded twisted pair (UTP), coax, fiberoptic).

Cons High cost.

Distance limitations.

Non-Deterministic (contention based).

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ARCNET

Pros ANSI standard.

Deterministic.

Scaleable speed.

No develop. tools.

High performance; medium cost.

Very fast comm. (150K to 7.5Mbps).

Transport media (UTP, coax, fiberoptic).

Cons Single source chip.

Too costly for low-end unitary controllers.

Distance limitations.

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MS/TP

Pros ANSI standard.

Deterministic.

Low cost.

Implementation in single chip microprocessors.

Cons Transport media (EIA-

485).

Limited speed (9.6K to 76Kbps).

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PTP

Pros Only choice for dial-up

connections.

Special design for point-to-point applications.

Accommodates modern modem standards (V.32bis, V.42).

Cons Transport media (point-to-

point only; EIA 232).

Limited speed (9.6K to 56Kbps).

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LonTalk

Pros Scaleable speed (32K to

1.25Mbps).

Transport media (UTP, coax, RF, IR, fiberoptic).

Cons Non-deterministic

(contention based).

Distance limitations.

Single source chip (Motorola and Toshiba).

Need develop. tools.

Limited application size.

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BACnet Transport Formats

MS/TP

LonTalk

ARCNET

Ethernet

Speed

Cost

higher

faster

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BACnet compatible

HVAC integration tested

NIST tested for compatibility

Building control integration tested

Pre-Tested to ASHRAE Updated Standards and UL

Listed

BACpac Portal

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Simplex BACpac Portal (4190-9008)

BACpac Port A 4100 Port B

TB2-1 TX TB2-3 RX TB2-2 RX TB2-1 TX TB2-5 GND TB2-5 GND

BACpac Port A 4020 Port B

TB2-1 TX TB1-8 RX TB2-2 RX TB1-6 TX TB2-5 GND TB1-10 GND

Port Settings Computer Port 9600 Baud Even Parity 8 Bits 1 Stop Bit

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Simplex BACpac Portal

PULL TO OPEN DOOREMERGENCY OPERATING

.

INSTRUCTIONS

. . . . .ALARM OR TROUBLE CONDITION:- SYSTEM INDICATOR FLASHING, TONE ON.

TO ACKNOWLEDGE:- PRESS "ACK" LOCATED UNDER FLASHING INDICATOR.- REPEAT OPERATION UNTIL ALL REPORTS ARE ACKNOWLEDGED.

TO SILENCE ALARM SIGNALS:- PRESS "ALARM SILENCE".

TO RESTORE SYSTEM TO NORMAL:- PRESS "SYSTEM RESET."- PRESS "ACK" TO SILENCE TONE DEVICE.

OPERATOR

INTERFACE

PANEL

ALARM ACK

FIRE

ALARM

ACKNOWLEDGE

SYSTEM

TROUBLE

SIGNALS

SILENCED

POWER ON

SYSTEM RESET

ALARM SILENCE

TBL ACK

SUPV ACK

PRIORITY 2

ALARM

ALARM ACK

SYSTEM

SUPERVISORY

4020 FIRE ALARM CONTROL

Portal

4100

Portal

NodeNode

Node

Portal

GCC

BACnetWorkstation

Node

PTP LAN

EIA 232

PTP(EIA 232)

PTP(EIA 232)

PTP(EIA 232)

EIA 232 EIA 232

50 ft Max.

50 ft Max. 50 ft Max.

4100U

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BACpac Portal on Ethernet LAN

SecurityPanel

Control PanelControl Panel

Vertical LiftPanel

LightingPanel

Control PanelUUKL Panel

UUKLPanel

Control Panel

HVACPanel

LAN

Portal

PTP to Ethernet

BACnetWorkstation

Ethernet

PTP

Ethernet

(EIA 232)

EIA 232

50 ft Max.

50 ft Max.

4100U

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Simplex...

Offers BACnet interconnectivity

Unlocks the gateway barrier to proprietary building management networks

Reduces the cost of information exchange