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8/10/2019 FF Cabling Solutions

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Cabling Solutions forFoundation Fieldbus Systems

By Raman KalraBelden India

Technology Event

Fieldbus Foundation Changing the Playing Field "

Date : 21 st June, 2008 (Saturday)Venue : TROPICANA Conference Room.Hotel : Taj Residency,

Akota Gardens,Vadodara - 390 020 INDIA


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AgendaFoundation Fieldbus Cable Standard

Beyond the Standard- Multi Pair Solutions- Field Barrier and Long Distance Applications

Cost Comparison

Jacket & Armouring Options


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FF standard

Colour code orange / blueJacket colour Orange or Blue (for IS applications)Optional armouring to meet e.g. Atex requirements

IEC 61158/ISA-SP 50 Standards Type AFF Specif icationH1 Cable Test specifications FF844

Conductor Size 18AWG(0.8 sq.mm)Impedance 100ohms +/-20Capacitance Unbalance 4nF/KmConductor DC resistance 24ohms/Km

Attenuation@39kHz 3dB/KmMax. Propagation Delay 1.7 S/KmMinimum Shield Coverage 90%Max Network Length 1900m


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Key Cable ParametersImpedance 100 @ 31.25 kHzCapacitance Unbalance < 4 F/km (capacitance between one wire andscreen to other wire and shield)

Conductor DC Resistance < 24 /kmCable Shielding > 90% coverage

CcS

Ccc

Insulation

Drain wire

Shield Inductance & resistance

Centricity

CcS

Conductor


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When twisted pair is exposed to a noise source such as runningmachinery or fluorescent lights , each conductor of the pair isexposed equally .

Capacitance Unbalance A Twisted Pair Exposed to a Noise Source

Key Cable Parameters


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Noise and Signal at the Receiving End of a Typical Pair

Ideal Capacitance Unbalance

When the capacitance of conductors within a pair are not equal, eachconductor will react differently to noise.Total subtraction of noise is vir tually impossible.



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When the capacitance of conductors within a pair are different, signals may travel atdifferent rates (velocity).Signal interpretation issues may occur as signals arrive at different times.Lower levels of capacitance unbalance equates to higher noise cancellation.



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FF vs Standard Instrument Cable

FF cable has lower Capacitance

FF cable is designed to a specific impedance toreduce signal reflections and maximize network lengthFF cables are tested during production to meetspecific requirements:

Capacitance Unbalance Impedance Conductor D.C. resistance


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FF Wiring

Control Strategy


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Agenda

Foundation Fieldbus Cable StandardBeyond the Standard- Multi Pair Solutions- Field Barrier and Long Distance ApplicationsCost Comparison



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Multi Pair Solutions

Multi Pair Fieldbus cables:

2 to 24 pair configurationsEach individual pair meets the FF Type ArequirementsOrange or Blue (IS) outer jacket

Armouring optionallyOther jacket materials optionally


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Agenda

Foundation Fieldbus Cable Standard


Cost Comparison



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Fieldbarrier ConceptFieldbarriers inZone 1Instrument Spursin Zone 0Bus trunklinealso used to

power theFieldbarriers

Maximize nr. of

instruments onthe bus in thezone.

R

Power Power SupplySupply

FieldbusFieldbus CardCard

FieldField ControlControl StationStation

HumanHuman Interface StationInterface Station

VV--networknetwork

Zone 1Zone 1

Zone 0Zone 0EexEex ia IICia IIC

EExEEx (e)(e) EExEEx (e)(e)


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Agenda

Foundation Fieldbus Cable Standard


Cost Comparison



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Reduction in hardware costs

4-20 mA

ISISIS IS IS Fieldbus

Less cable

Less installation timeLess I/OLess Interfacing

Reduced footprint in CR

Cost Comparison Vs Instr. Cable


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Cost ComparisonWhy is Fieldbus cabling more expensive than standard

instrumentation cable?PP instead of PVC or XLPE on the cores

More insulation material requiredMore complicated process = slower process = higher costs

0

20

40

60

80

100

120

140

160

PLTC ISOS FF Multi Pair BS5308 RE 2X(St)Y

P r i c e

I n d e x

-

200

400

600

800

1,000

1,200

1,400

V o

l u m e

i n k m


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AgendaFoundation Fieldbus Cable Standard


Cost Comparison



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Jacket options

$$Limited Smoke, Low AcidGas GenerationHalogen Free

$$$$High & Low Temp,Chemical ExposureTPE

$$$Chemical Wash Downs,

Exposure to ChlorinesCPE

$General ApplicationsPVCCost ApplicationsJacket Material


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Jacket options

PVC meeting UL 13 (for physical requirements) (UL 1685 for flamerequirements)

LSNH meeting IEC 60332-3-24 (c) CPE (for improved chemical resistance) meeting UL 13 (forphysical requirements) (UL 1685 for flame requirements)

Oil Resistant PVC meeting UL 13(for physical requirements) (UL1685 for flame requirements)

TPE jacket for improved flexibility meeting UL 13(for physicalrequirements) (UL 1685 for flame requirements)


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Armouring options

Interlock Aluminum

SteelProtective Metal Tapes Smooth or Corrugated (longitudinal or spiral

wrapped) Copper Aluminum Steel

SWA (Steel Wire Armour) Steel


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Why use armour Physical protectionMaintain signal integrity

Provides additional shieldingReduces cost of conduitDirect BurialEasy to install and re-routeRodent ProtectionHazardous Locations Class 1, DIV. 1 in Canada

Class 1, Div. 2 or Class 2, Div. 2 in USA Zone 0, 1 or 2 IEC 60079 and Cenelec


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FOUNDATION Fieldbus Features

PlantDiagnostics

process or equipment

Level 4

actuators, elementsvalves, connections

FieldPerformanceDiagnostics

Level 3

Fisher

DeviceDiagnostics

Level 2

electronics

CommunicationsDiagnostics

Level 1

communicationsFisher

More information from field devices.

Reduced maintenance

Diagnostics/Adv diagnostics/ Asset Management Pro-active maintenance

Fact based maintenance, avoid no action work

In order to achieve this all passive andactive components have to be optimized

for a flawless data-transmission


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Questions?

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