wirelesshart_guide part 4

8/9/2019 WirelessHART_Guide Part 4

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SystemEngineeringGuidelines

IEC62591WirelessHART

May-2014Revision04

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2.

Fo

rthenon-compliantdevice,

verifyproperpa

thstabilityandRSSIvalues.Path

stabilitiesshouldbegrea

terthan60%

andRSSI

shouldbegreaterthan-75dBm.

W

irelesscontroldevicesa

nddeviceswithupdate

ratesfasterthan2seco

ndsshould

ha

veapathstabilityof70%orgreater.Ifallthe

devicesonthenetwork

havevery

lowpathstabilities,buthighvaluesforRSSI,thiscouldbeanindicationof

broadband

interference.

3.

Lo

okatthelocationofthe

non-compliantdeviceinthenetwork.

Verifythereisnota

br

okennetworkdesignru

leoranunexpectedinstallationresultinginpoorRFsignal

pr

opagation.

I.

Addrepeater

sifnecessarytofortifyt

henetworkifthedevice

isisolated

fromthenetworkwithpoorconnections.

4.

Ve

rifythedevicehasprop

erpowerandisworking

properlyasasensor.

5.

Ve

rifythedeviceupdaterateisnotfasterthanthe

fastestallowedbythegateway.

6.

Eitherreducetheupdate

rateofthefielddeviceorincreasethefaste

stallowed

up

daterateonthegatewa

y.

6.23

NetworkCheckoutProcedure

Belowarebasicstepsforcheckingo

utanetwork.

Allowam

inimumof4hoursforthenetwork

toself-organ

ize(24hoursispreferre

d).

1.

Ve

rifythatalldevicesconnectedpassthewirelessconnectivitytest.Th

egateway

sh

ouldhaveanindication.

2.

Ve

rifyaminimum

of15%

ofdevicesaredirectlyconnectedtothegateway.

The

de

signparameteris25%;theminimumacceptableis10%.

Networkswith

morethan

20

%ofdeviceswithupda

teratesfasterthan2s

econdsorwirelesscontroldevices

ha

veadesignparametero

f50%and40%shouldbeconnectedafterinstallation.

The

ga

tewayshouldhaveanin

dication.

3.

Ve

rifyoverallnetworkreliabilityisgreaterthan9

9%.

Thegatewayshou

ldhavean

indication.

6.24

Lightning

Protection

1.

En

surethattheWirelessHARTdevicebodiesareco

rrectlygrounded

2.

Th

einstallationmanuals

ofallWirelessHARTdevicesshouldbeconsultedpriorto

installation.

3.

In

general,WirelessHART

devicesshouldnotbe

thetallestfeatureintheplantto

maximizeprotectionagain

stlightning.


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4.

En

sureadequateprotectionisprovidedbetweentheWirelessHARTgatewaysand

ho

stsystem

connection

asalightningstrikecoulddamagemoretha

njustthe

W

irelessHARTgateway

5.

In

general,wirelessdevice

smayprovidebetterprotectionofthesystemthanwired

,

as

theenergyfromalightningstrikewillnotbeab

letotravelthroughthe

wiringand

ca

usepotentialdamaget

oothercomponents.St

andardssuchasNFPA7

80provide

classificationforzonesof

protectionfromlightnin

gaswellastechniques

forproper

im

plementation.

6.25

DevicePa

rameterConfigura

tionVerification

DeviceParametersverificationisim

portantbeforeputtingintoservice.

Deviceparameterlist

willchange

basedondevicetype.

However,followingis

thelistofcommonWirelessHART

parameters

thatcanbeusedforv

erification.

Theseparameterscanbeverified

alongwith

devicedatas

heetspecifications.

TAG

DeviceID

NetworkID

NetworkJoinStatus

WirelessMode

JoinMode

NumberofAvailableNeighbours

NumberofAdvertisementsHeard

NumberofJoinAttempt

s

Manufacturer

DeviceType

DeviceRevision

SoftwareRevision

HardwareRevision

Identification

Revisions

Radio

Sensorinformation

ElectronicsTemperature

SupplyVoltage

SupplyVoltageStatus

LastUpdateTime


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6.26

LoopCheckout/SiteIntegrationTests

OnceWirele

ssHARTdevicesareconnectedtothegatewaya

ndthenetworkischeck

edout,the

loopcheckoutmaynotbenecessary

inthetraditionalsense.

Wirelessconnectiontestingverifies

eachfielddevicehasth

eproperconfiguration.

Sincethere

arenowirestogetconfusedandswapped

,thereisnonee

dtodothetraditionalloopcheck.

Alternative

loopcheckscouldbetoensureeachfielddevicesisreportingtothecorrect

gatewayandeachgatewayisconne

ctedintothecorrecthostsystem.

Traditionala

pplications

ofsensorstimuluscanbeperform

edforconfidence,

but

arelessvaluableinapuredigital

architecture

ifthereiscompleteassuranceafielddevicew

ascommissionedwith

thecorrect

tagandconfiguration.

6.27

BenchSim

ulationTesting

EachWirelessHARTfielddeviceiscompliantwiththeIEC62591protocolwhichhasprovisions

forsimulatio

n.

Eachdevicecanbep

utintoasimulationmode.

Benchsimulationtes

tingshould

alsoverify

thatallHARTFieldCo

mmunicatorshavethe

properconfigurationanddevice

descriptors(DDs)foraccessingthelocaluserinterfaceoffielddevicewheninthefield

.

6.28

Provision

ofSpares

Belowareth

erecommendedspares

tohaveonsite:

Sparelightningarrestor

componentsforgateways,iflightningprotection

isused

.

Sparegatewaysshould

bekeptaccordingt

o

sparespolicyforhostsystem

equipment(e

.g.

I/Ocards).

Configurationsforgatewaysshouldbecon

venientfor

rapidreplacementifnec

essary.

Sparebatterymodules.

Spare

field

devicesas

determined

by

the

policy

forwired

field

devices.

Considerationshouldbegivenforadditionald

evicestobeusedasrepeaters,

if

necessary.

6.29

RemovalofRedundantEquipment

Repeatersused

temporarily

tofortify

a

network

can

be

removed

and

reu

sed

ifthe

WirelessHAR

Tnetworkgrowstoapointwhererepeatersare

nolongerneeded

.

6.30

Pre-Comm

issioning

6.30

.1

Pre-CommissioningRequirements

1.

Determine

which

WirelessHART

instrumentsand

WirelessHART

Gat

ewaysare

installedcorrectly

.CrosscheckinstrumentationagainstInstrumentDataSh

eets.


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2.

Conductsitewalk-t

hroug

htodetermineWirelessHARTGatewaylocatio

nandany

in

frastructurebarriers.En

surelocalpowerisavailableforWirelessHARTdevicesand

GatewaysandPlantNetworkradios.

3.

DetermineSmartWirelessGatewayconnectionba

cktohostsystem(Seria

l,Ethernet,

W

iFiNetwork).

4.

Determineifotherformsofexistingwirelesspresentinandaroundthelo

cationthat

m

aycauseinterference(C

ellphonetowers,

highp

owerradiotransmitters)

6.30

.2

DefiningW

irelessHARTPre-comm

issioningMethodsandAcceptance

Definethep

re-commissioningactivitiesforthefollowing:

Devices:

Confirm

deviceinstallationandconfigurationaspercustomerrequire

mentsand

specifications.

Network:

ConfirmthenetworkisupandrunningintheSm

artWirelessGateway.

Verifyeach

deviceisconnectedand

networkmeetsbestpra

ctices(neighbours,

hopsetc).

Security:

Verifysecurityset-up

and

configure.

Configurefirewallasperrequirements

(optional)

.

Powerupsequence:

Thebattery

shouldno

tbeinstalledonany

wirelessdeviceuntilth

eWireless

Gatewayisinstalledan

dfunctioningproperly

.Wirelessdevicesshouldalsobe

poweredupinorderof

proximityfromtheWirelessGateway,

beginningwiththe

closest.

Thiswillresultinasimplerandfasternetworkinstallation.

En

ableActive

AdvertisingontheGatewaytoensurethatnewdevicesjointhenetwork

faster.

6.31

SiteAcceptanceTest(SAT)

The

siteacceptance

shallcover

primarily

allWirelessHART

infrastructures,

associated

hardware,s

oftwareandoperationalchecks.

Verifytheinstalledinfra

structureasBOM.

Verifynetworkcommun

ication

Verifythecorrectconfig

urationofWirelessHART

networkcomponents.

Datacommunicationsbetweenwirelessdevices

andDCS

Verifyfaceplatesandall

HMIelementsforconne

ctedwirelessdevices

PrepareSATreportand

signoffwithcustomer.

DocumentationforSiteAcceptanceTestdocumentation:


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SAT

Plan

SAT

Procedure

SAT

Checklist

6.32

CommissioningandStart-up

WirelessHAR

Tgatewayssegmentthecommissioningprocess.

Sincegatewaysconnectthe

wirelessfielddevicestothehostsystem,

WirelessHARTde

vicescanbecommissio

nedtothe

gatewayto

ensureproperconnectivityindependentlyof

verifyingintegrationintothehost

system.

Aw

irelessloopcheckcanc

onfirmconnectivityfromthewirelessfielddevicethrough

thegateway

tothehostsystem.

Interactionwiththeproces

sandtheWirelessHART

devicecan

confirmthe

deviceisoperational.

6.32.1

WirelessNetworkIntegrationwithHMIandLoopchec

k

VerifydevicevariablesintheSmart

WirelessGateway.

Also

checkparameterslikeT

AG,

Device

ID,

Network

ID,

NetworkJoinStatu

sandDeviceStatus.V

erifydeviceoperation

from

three

places:

AtthedeviceviatheLoc

alDisplay

UsingtheHandheldcom

municator

Hostsystemuserinterfa

ce.

6.32.2

Integrating

HostandFieldNetworks

ConfiguretheWirelessGatewayorwirelessinterfacenetworkIDandjoinkeyand

verifyconnection.

ChecktheinstallationoftheWirelessGatewaya

ndpowerup.

HostIntegrationofgatewaysthroughEthernetc

onnectivity

HostIntegrationofgatewaysthroughSerialconnectivity

HostIntegrationgatewa

ysthroughFiberoptics

Hostintegrationoverwi-filink

.

6.32.3

OnsiteWirelessNetworkReliabilityTests

1.

Atdevicelevelcheck

Jo

inStatus,WirelessMod

e,

JoinMode,

Numbero

fAvailableNeighbours,

Numberof

AdvertisementsHeard,Nu

mberofJoinAttempts.

2.

Durationbasedtests

Carryoutfollowingtests


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Loopresponsetim

e

Consistency

in

process

data

update

.

Network

and

device

uptime

confirmations.

Obstructiontests

Networkuptimet

estfor2,4,8,1

2,

24Hour

s

3.

W

irelessSiteExecution

M

aintaintherecordsforfollowingtopics

Systemfiles(inclu

dingdiagnostics)

Diagnostics

Validationform

WirelessDeviationRegister

PunchLists

FinalBillofmateriallist


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7

Operate

OperatephaseforWirelessHARTnetworkcoversaspectslikeWirelessHARTassetManagement,

DataManag

ementconcepts,

MaintenancePractices,etc.

FollowingFigure18showstheinputsandoutputsoftheOp

erationphase.

F

igure18:OperatePhase

7.1

AssetMo

nitoring

Withtheus

eofWirelessAssetMan

agementApplications,userscanplan,

customize,

visualize

and

manag

e

smartwirelessnetworks.

AssetManage

mentsystem

handles

predictive

diagnostics,

documentation,

calibra

tionmanagement,and

deviceconfigurationfo

rmanaging

field

instruments.

Assetmanagem

entsystem

allowschanging,

storing,

comp

aring,

and

transferring

deviceconfigurationsw

ithoutevergoingintothefield

.Streamlinethe

calibration

bydefiningdevicetestschemes,sch

edulingdevicecalibration,

andmanagingdevice

calibration

data.


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WiththeA

ssetManagementSystem,

wirelessdiagnosticsareorganizedacro

ssmultiple

WirelessGa

teways.Assetmonitoringsystem

providesdetailreports.Below

are

thelistsof

fieldsyouca

nuseinyourreports:

Devicetag/Gateway

Batteryvoltage

Updaterate

Ambienttemperature

Status

Parents/children/neig

hbours

7.2

AlarmandAlertsPhilosophy

ConfigureProcessAlerts

Processalertsallowthetransmittertoindicatewhenthe

configureddatapointisexceeded

.

Processaler

tscanbesetforprocessvariableandsecondary

variable

.Forexample,forpressure

transmitter,

processalertscanbesetforpressure,

temperature,

orboth.

Thealertwillreset

oncethevaluereturnswithinrange.

DeviceAlertdisplayedon:

FieldCommunicator

Assetmanagementsystemstatusscreen

Intheerrorsectionofth

eLCDDisplayofinstrum

ent

FollowingalarmsconfigurationcanbeusedforWirelessHAR

Tdevice.

HIHIAlarm,

HIAlarm,L

OAlarm,

LOLOAlarm

7.3

DataMan

agementConcepts

Duringnorm

aloperationWirelessHARTsystemconfigurationdatashallbemaintained

.Periodic

systemback

upshouldusedfromsystemsoftware.

Deviceconfigurationandaudittr

ailsshallbe

maintained.

Maintenanc

e,

calibrationandinven

torydocumentationreq

uirementsshallbeusedfromhost

systemcapa

bilities.

7.4

Maintena

ncePractices

Maintainea

chWirelessHARTdevice

perthedevicemanual.

Thenetworkwillselforganizean

dprovidealertsforch

angesrequiringintervention.

The

gatewayshouldhaveanindicationo

fperformanceissuesin

thenetworkorfielddev

ices.


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8

Project

Management

Thissection

explainsProjectManagementaspectsforWirelessHARTProjects.

8.1

WirelessH

ARTProjectMana

gementOverview

Thissection

summarizestheoverall

conceptofWirelessHAR

Tprojectmanagement.

CustomerR

equirements,ComplianceandAssumptions

Customerrequirementsdocument

shouldbeevaluatedthoroughlybasedonpara

meterslike

pastprojectknowledgebase,

system

andtechnologycapa

bilities,projectbestpr

acticesetc.

Regionalandcountryspecificrequir

ementsmustbeunderstoodcorrectly

.

Compliance

toCustomerrequirementsdocumentshallbe

prepared

.Validassum

ptionsshall

beusedand

discussedwiththecust

omerwhereinformation

isuncertain.

8.2

WorkBre

akdownStructure

andCostEstimatio

n

Vendorsof

WirelessHARTfielddev

icesmayhavecostcalculatorsandcapitalpro

jectstudies

thatcanbe

referencedandcomparedtosupportthecostju

stificationofwirelessin

toaproject

oranallw

irelessproject.

Foralargecapitalproject,

wirelesscanreducecapitalcostsby

switchingw

iredmonitoringpointstowireless.

DesignEngineersshouldassessan

dincorporatethefollo

wingfactorsintheirp

rojectcost

estimatingc

alculationmodel:

Reducedengineerin

gcosts(includingdrawinganddocumentation,andFactory

AcceptanceTest)

Reducedlabour(fieldinstallation,

commissioning,

supervision)

Reduced

materia

ls

(terminations,ju

nction

boxes,

wiring,

cable

trays/conduit/trunk

ing,

powersupplies,and

controlsystemcompon

ents)

Reducedcostofch

angeordermanagemen

t(includingadding,

rem

oving,

and

movingfielddevices)

Reducedprojectexecutiontime(includin

gcommissioningofwirelessfield

devicesimultaneouslywithconstruction)

I/O

capacitymanagement(eachWirelessH

ARTgatewayessentiallyprovides

spareI/Ocapacity)

8.3

SubcontractorScopeManag

ement

Wirelessen

ablessimplifiedsubcontractorscopemanagement.Packagescanbee

asilytested

and

commissioned

separately

,re

quiringonlyminimalintegration

and

testing

to

occur.


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Additionally

,thesubcontractorsw

illalsobenefitfromfe

wercomponentsande

ngineering.

Tendercontractsshouldbeamende

dtorecognizereducedcomplexityandeliminatedwork.

8.4

ProjectScheduling

1.

Reviewschedulestorecognize:

I.

Limited

infrastructureinstallationandhencereducedm

aterialand

installationscope.

II.

Removesom

eelectricalandinstrumentationcheckoutproce

sses.

2.

Amendcontractstoreflec

tsimplifiedinstallationhandoverprocesses.

3.

Simplifyinstallationsched

ulemanagement.

4.

Reducematerialcoordina

tionmanagementandsimplifiedconstructionsc

hedule

.

I.

Eliminated

scheduling

and

expediting

associated

with

marshalling

cabinets.

5.

ScheduleshouldreflecteliminatedactivitiesandsimplifiedFAT,

SATandSIT(site

in

tegrationtest)onareas

wherewirelesshasbeenextensivelydeployed.

8.5

ResponsibilityandSkillsMa

trix

Amend

Roles

and

Responsibility

matrix

to

reflect

reduced

/eliminated

responsibilities.

Ensureengagementofallprojectstakehold

ers/sub-contractorsothatwireless

canbeappliedefficientlytoimproveschedu

leandmaterialcosts

ResponsibilityandSkillsmatrixshallbedevelopedforeach

phaseoftheproject.En

duser,EPC

ContractorandMainAutomationV

endorshalldefinethe

RolesandResponsibilitymatrixfor

eachtasko

fprojectlifecyclelikep

re-FEED,

FEEDandExce

utephaseofproject.S

takeholders

shallassign

withroleslike:

Responsible

Accountable

Consulted

Informed

8.6

ManagingProjectChangeRequests

Forproject

changeordersandothe

rlatedesignchanges,w

irelessshouldbeconsid

eredasthe

primarysolutionunlessotherdesignconsiderationsexist.

Usingwirelesswillresultinthe

fewestchan

gestothedocumentat

ion,

I/Olayoutandotherdetaileddesignaswellasfaster


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commission

ingsinceyoucanmovewirelessdeviceswithouthavingtoalsore-engineerthe

wiring.

8.7

Progress

ReviewsandReporting

Definethe

projectexecution

sta

gesforreview.

Preparereview

reportsand

inform

all

stakeholder

s.

8.8

CustomerDeliverables

Preparethe

listofdocumentationtobesubmittedtocustom

er.

8.9

Training

Includethe

trainingrequirements

forPlantoperators,M

aintenanceteam

and

Engineering

team.

8.1

0

WirelessHARTProcurement

andContractPlan

Checkcomp

letenessofcontractdcoumentslikeTechnicalS

pecifications,Deliveryr

equirement

(time&location),Quoterequirem

ent(Expecteddatean

dvalidity,

regionalregulationsfor

WirelessHARTotherT&Cs),andDocumentation&Certificationrequirements.

8.1

1

Material

Requisitions

Giventhen

eedforsecurityandRF

emissions,vendorsmus

tacquireapprovalsforimportation

tothecountryofend-useforco

mpliancewithlocalsp

ectrum

regulationand

encryption

regulation.Thevendorcanverifywhetherimportationcomplianceexistsforanygivencountry.

Thebatteriesarecommonlymad

eusingahighenergy

compoundusingLithi

um

Thionyl

Chloride.T

heMaterialSafetyData

Sheetorequivalentshouldalwaysbeavailableaswellas

awarenessofanyshippingrestriction;notablymostcountr

iesdonotallowthetra

nsportation

oflithiumbatteriesonpassengeraircraft

.

8.1

2

Documen

tationRequirementsinProjectExecu

tion

Equipment3Dlayou

ts

SitePlan

Drawings

ControlNarratives

ProjectManagementPlan

Siteexecutionplan

Testing(FATandSA

T)

Installationprocedu

reandchecklists


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Commissioningand

start-upchecklists

Signoffdocuments

Everyproje

ctwillrequiretheesta

blishmentoflocalstan

dardsforimplementingconsistent

documentation.

See13DocumentinginIntergraphS

PI2009foracompletet

reatmentofdocumenta

tion.

8.12.1

ISADocum

entation

TheAmeric

anNationalStandardd

ocumentANSI/ISA-5.1-2

009:InstrumentationS

ymbolsand

Identificatio

n,

approved

on

Sep

tember

2009,

provides

basic

guidelinesfor

wireless

instrumentationandsignals

.

Keypoints:

1.

Thereisnodifferenceint

hesymbolbetweenaHART,

FF,

andaWirelessH

ARTdevice.

A

ninstrumentisaninstru

ment.

2.

Thelinestyleforindicatin

gawirelesssignalisazigzagandnotadash.

BelowisanimagefromtheISA-5.1

documentshowingsomecomparativeexamples.

PleasereferenceISA-5.1f

orcompletedetails.

Figure

19:ISA5.1WirelessDr

awing

3.

The

implementationof

WirelessHART

requiresfarfewercomponen

ts,

making

drawingssimpler.


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PA

RTII

WirelessHARTField

Network

Components


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9

FieldDeviceRequirem

ents

9.1

SupportforWirelessHARTF

unctionality

AllWirelessHARTdevicessupport

methodstoallow

remoteaccesstodeviceco

nfiguration,

backwards

compatibility

withe

xisting

field

commun

icators,

full

impleme

ntation

of

WirelessHARTsecurityprovisions,a

ndWirelessHARTinteroperability.

9.1.1

DeviceDia

gnostics

HARTDiagn

ostics

WirelessHARTdevicescontainsimilarorasubsetofallofth

ediagnosticsofwiredH

ARTdevices

expectconfigurablealarms,device,

batteryandalertsfortheprocess.

Diagnostics

information

shouldbea

vailablethroughHARTc

ommandsaswellasacc

essiblethroughDeviceDescriptions

(DD)eitherlocallythroughafie

ldcommunicatororremotelyusingassetm

anagement

software.

WirelessFieldDeviceNetworkDiagnostics

EveryWirelessHARTfielddevicesh

ouldhavediagnosticsth

atindicateifadeviceisconnected

toanetwor

kornot.

WirelessFieldDevicePowerDiagnostics

Wirelessfielddevicesmayhave

oneofthreepowero

ptions:battery,

energy

harvesting

(includings

olar),

orlinepower.Bat

terieswillhavealifede

terminedbytheupdate

rateofthe

wirelessfie

lddevice,

networkrout

ingforotherwirelessfielddevices,andefficienciesofthe

sensorand

electronics.

Typically,th

eprimaryconsumerof

poweristheprocessse

nsorandelectronicsinthewireless

fielddevice

.UsingtheWirelessHAR

Tradiooractingasare

peaterforotherWirelessHARTfield

devicesreq

uiresminimalpower.W

irelessfielddevicesreporttheirbatteryvoltageandhave

integratedlowvoltagealarmssuch

thattheusercaneith

erschedulemaintenanceortakea

correctivea

ction.

GatewayNetworkDiagnostics

Gatewayn

etworkdiagnosticsshould

indicatewhether

field

devicesareconnected

and

functioning

properly,

andifdevicesaremissingfrom

thenetwork.

Inordertobeconnected

properly,p

roperbandwidthmustbeallocatedbasedonthe

updaterateofthedevice.

Adevice

connectedbutwithservicedeniedmayindicateadevicehasanupdateratethatis

toofastfor

thenetworkcapabilityorthenetworkconditions.With

gatewayscapableofholding100

devicesorm

ore,

clearindicationof

deviceavailabilityiscrucial.


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Additionally,

gatewaysshouldbeabletodetect,

regardle

ssofhostsystem

integration,

the

connectedn

essofawirelessfieldd

evice.

Thisinformation

shouldbecontinuallyu

pdatedand

indicateifa

deviceisnotconnected

fornetworkordevicereasons.Simpledevicestatesshould

bemadeavailableforintegrationintothehostsystemreg

ardlessofoutputprotocolfromthe

gatewayto

indicateonline/offlinestatus.

9.2

DeviceM

ounting

Devicemou

ntingconsiderations

Verifythep

rocessapplicationsuchasGas,LiquidandSteam

flowingthroughtheprocesslines.

Checkford

eviceprocessconnectionrequirementsandensuretheprocesslineisolationbefore

installation.

Ifthetrans

mitterinstallationrequ

iresassemblyoftheprocessflanges,manifold

s,orflange

adapters,

follow

DeviceManual

assemblyguidelinesto

ensureatightseal

foroptimal

performanc

echaracteristicsofthetransmitters.

Antennapo

sition

Positiontheantennavertically,ei

therstraightuporstraightdown.

Theantennashouldbe

approximat

ely3ft

.(1m)fromany

largestructureorbuildingtoallowclearcommunicationto

otherdevices.

MountingH

ighGainRemoteAnten

na

Thehighg

ain,

remoteantennao

ptionsprovideflexibilityformountingtheW

irelessHART

Devicebase

donwirelessconnectivity,

location,

andlightnin

gprotectionrequirements.

Chooselocationwheretheremote

antennahasoptimalwirelessperformance.

Ide

allythiswill

be15-25f

t(4

.6-7.6

m)above

thegroundor6ft(2

m)aboveobstruction

sormajor

infrastructu

re.

Checkforw

eatherproofing/lightnin

garresterrequirements

.

9.3

FieldDev

icePower

Wirelessfielddevicesmayhave

oneofthreepowero

ptions:battery,

energy

harvesting

(includingsolar),

orlinepowerandtheremaybeseveralop

tionswithineachcategory.

Batteries

Themostc

ommonwillbetheuseofabatteryforlowpowerfielddevicesdue

toeaseof

deployment.Mostvendorswillusebatterycellsincor

poratingLithium

Thion

ylChloride

chemistrysinceithasthehighes

tenergydensity,

longestshelflife

,andwidestworking

temperatur

esthatarecommerciallyviable

.Althoughtyp

icalcellslooklikebatterycellsfor


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consumere

lectronics,precautions

shouldbetakentoensurebatteriesaresafely

transported

andintroducedintotheprocessenvironment.Referto

Vendordocumentatio

nforsafe

handlingpr

actices.

Belowarer

equirementsforbatteries:

Batteriescellsshou

ldbeassembledbyama

nufacturerintoabatter

ymoduleto

ensuresafehandlin

gandtransportation.

Batterymodulesho

uldpreventadepleted

cellbeingintroducedin

circuitwith

achargedcell

,whic

hcancauseunintended

electricalcurrentsandh

eat.

Batterymodulesh

ouldprovideeaseof

replacement.Batteryreplacement

shouldtakeminima

ltimeandtraining.

Batterymodulesh

ouldbeintrinsicallysafeandnotrequirerem

ovalofthe

wirelessfielddeviceforreplacement.

Batterymoduleshouldpreventintendeda

ndunintendedshort-circuitingthat

couldleadtoheato

rspark.

Battery

modules

hould

be

designedfo

rthe

processenviron

mentwith

mechanicalpropertiesthatprovidedroppr

otectionandoperationovernormal

processtemperaturesexpectedfordevices.

Batterymodulessh

ouldcomewithnecess

aryMaterialSafetyDataSheets(or

equivalent)andwarningsandbedisposable

perlocalgovernmentalregulation.

Batterymoduleshouldnotbecapableofconnectingtoconsumerelectronics

ornon-designeda

pplicationstoprevent

ahigh-capacitysupply

from

being

connectedtoincom

patibleelectricalsystem

s.

Batterymodulessh

ouldbeapplicabletose

veralWirelessHARTfielddevicesto

maximizeinventorymanagementefficienciesinthelocalwarehou

seforspare

parts.

Thedesign

engineersofthewirelessfieldnetworkandend

usersshoulduseupdateratesthat

maximizethelifeofthebatterymoduleandminimizemaintenance.

Forachievinglongerbatterylifeche

ckforfollowingrecomm

endations:

CheckthatPowerAlwaysOnmodeisoff.

Verifydeviceisnot

installedinextremetem

peratures.

Verifythatdeviceisnotanetworkpinchpo

int.

Checkforexcessive

networkrejoinsduetopoorconnectivity.

EnergyHarvesting

Vendorsmayprovideenergyharvestingoptionsasalternativestobatteriesthatmayinclude

solar,therm

al,vibration,

andwindsolutions.Currentenerg

yconversiontechniques

forthermal

andvibrationarerelativelyinefficient.Inmanycases,ene

rgyharvestingsolutionsalsoutilize

rechargeab

lebatteriestomaintainconstantback-uppowersupply

.

Todaysrechargeable


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9.7

Manufac

turerDocumentation

EveryWirelessHARTdeviceshouldhavetheproperdocume

ntation,

includingmanu

al,aswould

beexpectedwithawiredHARTdev

ice.


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10

AncillaryWirelessHARTDevices

Anancillarydeviceisdefinedasanydevicethatdoesnotcontainameasuringsens

ororoutput

tothepro

cessforactuation.

Th

eseincludewirelessg

ateways,localindicato

rs,

wireless

repeatersa

nd/orWirelessHARTadapters.

10.1

Gateway

s

The

gatew

ayenablescommunication

between

wirelessfield

devicesandhostsystems

connected

to

an

Ethernet,ser

ial,or

other

existing

plant

communication

s

network.

WirelessHA

RTmanufacturershave

typicallychosentointegratethenetworkmana

ger,security

managerandaccesspointfunctionalitiesintooneproduc

t.Conceptually,

thegatewayisthe

wirelessversionofmarshallingpanelsandjunctionboxes.

Figure2

0:GatewaySystemArchitecture

BelowaretherequirementsforaW

irelessHARTgateway.

Gatewayshouldprovideaneasytoman

agesolutionforenablinggateway,

networkmanagement,andsecuritymanagementfunctionality.

Gatewayshouldhavecontrolledaccessfo

rasecuritypolicy.

Gatewayshould

havemultipleuse

raccountswithdifferingaccesstocriticals

ecurityand

configuration

par

ameters

such

that

there

can

be

secure

network

administration.

Gatewayshouldh

avemultipleoutputpr

otocolstoensureintegrationtoa

rangeofhostapplications.Inanygivenp

rocessfacility,

therecanbeseveral

wirelesshart_guide part 4

Documents