Building Technologies Standard Protocols Update January 2011 Building Automation Integration & Standard Protocols

Building TechnologiesStandard Protocols Update January 2011

Building Automation

Integration & Standard ProtocolsIntegration & Standard Protocols


Topics

• Systems integration why and how?• Protocol inner workings • BAS migration• Modbus pros and cons • LonTalk pros and cons• BACnet pros and cons• Questions

Fascinating!!


Protocols within building subsystems…

BACnetLonTalkModbusOPCProprietary

ModbusLonTalkBACnetEIBProprietary

ModbusProfibusOPCProprietary

BACnetLonTalkModbusProprietary

ProprietaryBACnet

ProprietaryBACnet

ModbusLonTalkProprietary

Graphics, Internet

Schedules

Reports & Alarms

Text & E-mail

H

V

A

C

F

I

R

E

A

C

C

E

S

S

L

I

G

H

T

I

N

G

P

O

W

E

R

S

C

A

D

A

B

A

S


BACnet/IP

System Architecture

BACnet MS/TP, LonTalk, ModbusProprietary Protocols, Modbus

H

V

A

C

L

I

G

H

T

I

N

G

B

A

S

F

I

R

E

A

C

C

E

S

S

P

O

W

E

R

B

A

S


B

A

S

BACnet/IP

Ethernet

Legacy BAS Migration

Proprietary Protocol to BACnet/IPProprietary Protocol to BACnet/IP

Functions to ExpectFunctions to Expect

Translation

B

A

S

Translation

Monitor and Command

Alarm

Trend

Schedule

Proprietary

Protocol A

Proprietary

Protocol B


B

A

S

BACnet/IP

Ethernet



Migration Changes ToolsMigration Changes Tools

Translation

B

A

S

Translation

Programming

Database

Commissioning Tools

Schedules

Proprietary

Protocol A

Proprietary

Protocol B


B

A

S

BACnet/IP

Ethernet



BenefitsBenefits

Translation

B

A

S

Translation

Single Programming Language

Single Database

Consistent Commissioning Tools

Consistent Schedules

Proprietary

Protocol A

Proprietary

Protocol B


Top Benefits of Sharing and Aggregating Information

● Lower energy costs

● Lower maintenance costs

● Improved staff utilization

● Lower repair and replacement costs/extend equipment life

● Increase occupant comfort/tenant productivity

● Improve system performance

● Generate business decision support information

● Enterprise wide data consolidation


Protocol Inner Workings

A protocol is a set of rules defining the format of data transmission between two or more devices.

The protocol defines:

•Data format and composition

•Addressing

•Error checking

•Data compression

•Send/receive message notification

For communications to work effectively between two or more devices, the rules covering the required functionality must be interpreted and implemented exactly the same way

The OSI Model explains the basics


• Developed by Modicon (Schneider Electric)

• Considered a defacto-standard• Register based protocol

• Digital data• Analog data

• Master/Slave or Client/Server based architecture

• Several types of Modbus:• Modbus RTU• Modbus ASCII• Modbus Plus• Modbus TCP

Integration Using Modbus

ModbusModbus - Overview - OverviewModbusModbus - Overview - Overview

ModbusDriver

EBLNMLN

RS-485

Modbus TCP

Modbus RTU


• Simple data protocol means simple development

• Extensive implementation in many building systems:

• Process controls• Power meters• Power and Lighting control• Chillers• Boilers• BAS

• Leverage existing driver development and integration expertise


Modbus - ProsModbus - ProsModbus - ProsModbus - Pros

ModbusDriver

EBLNMLN

RS-485

Modbus TCP

Modbus RTU



Modbus - Modbus - ChallengesChallengesModbus - Modbus - ChallengesChallenges

• Simple protocol means functionality limited

• No high level application standardization

• No time stamping

• Information limited to simple register data implemented by vendor

• Vendors may not implement the standard consistently

• Mapping is project specific

ModbusDriver

EBLNMLN

RS-485

Modbus TCP

Modbus RTU


Integration Using LonTalk

LonTalk – OverviewLonTalk – OverviewLonTalk – OverviewLonTalk – Overview

• LonWorks Technology is from Echelon Corp.

• LonWorks is a suite of products

• LonMaker Integration Tool

• LNS network operating system

• iLon IP router and Internet Server

• LonTalk protocol

• Neuron Chip

LonTalk Devices

LonTalkDevices

Network Manager



LonTalk – ProsLonTalk – ProsLonTalk – ProsLonTalk – Pros

• LonTalk is the standard protocol• ANSI/EIA/CEA 709.1 A 1999

• LonTalk is an effective device level protocol standard

• Product selection impressive• HVAC and BAS devices• Lighting control

• LonMark controllers adhering to LonMark profiles are cost effective and standard

• Neuron chip provides unique address out of factory

LonTalk Devices

LonTalkDevices

Network Manager



LonTalk – LonTalk – ChallengesChallengesLonTalk – LonTalk – ChallengesChallenges

• LonTalk standard does not define important applications

• Scheduling, Trending, Alarming, Programming, etc.

• LonMark profiles provide few mandatory network variables, leading to many variances in vendor implementations

• LonMark programmable controllers do not conform to LonMark profiles

LonTalk Devices

LonTalkDevices

Network Manager




• Device vendors create non-standard implementations

• proprietary network variables

• proprietary start-up and commissioning tools

• Little acceptance in certain systems

• Fire, Security, Power, PLCs LonTalk Devices

LonTalkDevices

Network Manager




• LonTalk Standard does not define system level components

• Network Operating Systems

• Network Management Software products

• Web server products

• Database is site/job and vendor specific

• Hardware, licensing fees, and royalties are high

LonTalk Devices

LonTalkDevices

Network Manager


• ASHRAE 135-2004 and 2008 Standard

• Communications media (MS/TP, ARCnet, Ethernet, IP, PTP, LonTalk)

• PICS (Protocol Implementation and Conformance Statement) and BIBBS (BACnet Interoperability Building Blocks) from vendors

• BTL (BACnet Testing Lab) certification process

BACnet - OverviewBACnet - OverviewBACnet - OverviewBACnet - Overview

Integration using BACnet

Ethernet

RS485

Other BACnet Controller

BACnet/IP

BACnetMS/TP


• Available from most BAS and HVAC equipment vendors

• Cost effective integration solution• Standard provides insulation from

vendor system migrations and upgrades

• Standard allows for flexibility in implementation

• Protocol implementation disclosure documents (PICS and BIBBs)

• Testing procedure and certification (BTL)

BACnet - ProsBACnet - ProsBACnet - ProsBACnet - Pros


Ethernet

RS485


BACnet/IP

BACnetMS/TP


• Network security• Encryption mechanism in

review• Standard in review for user

authentication and access rights

• Programming language• Every system will have a

unique programming language

• Unique programming tools are required for each vendor

BACnet - ChallengesBACnet - ChallengesBACnet - ChallengesBACnet - Challenges


Ethernet

RS485


BACnet/IP

BACnetMS/TP


• Configuration tools are proprietary• No device application profiles• System and device control

algorithms are unique to vendors• Database structure not

standardized• Methods of implementing

functionality vary from vendor to vendor

• Private transfer services• Proprietary objects

BACnet - ChallengesBACnet - ChallengesBACnet - ChallengesBACnet - Challenges


Ethernet

RS485


BACnet/IP

BACnetMS/TP


Steps to Successful Integration

• Document functional requirements

• Assess and assign integration responsibilities

• Assess the capabilities against expectations and requirements

• LonTalk Variables

• Modbus Register List

• BIBBS (BACnet Interoperability Building Blocks)

• BACnet Object List

• Communication between departments

• Facilities

• IT

• Purchasing

• Communicate and coordinate vendor responsibilities for integration implementation and commissioning


Questions

Documents

Building Technologies Standard Protocols Update January 2011 Building Automation Integration & Standard Protocols