UsingUsing FFOUNDATION™OUNDATION™

FieldbusFieldbus

Purpose of this PresentationPurpose of this Presentation To introduce FTo introduce FOUNDATION™OUNDATION™ Fieldbus Fieldbus

technologytechnology To describe and demonstrate how to To describe and demonstrate how to

install and configure Finstall and configure FOUNDATIONOUNDATION Fieldbus Fieldbus control systemscontrol systems

To illustrate the use and benefits of To illustrate the use and benefits of fieldbus with examplesfieldbus with examples

To Describe how to analyze the SegmentTo Describe how to analyze the Segment

Steps in a Fieldbus ProjectSteps in a Fieldbus Project

UNDERSTANDING THE TECHNOLOGYUNDERSTANDING THE TECHNOLOGY INSTALLATIONINSTALLATION CONFIGURATIONCONFIGURATION OPERATIONOPERATION

Steps in a Fieldbus ProjectSteps in a Fieldbus Project UNDERSTANDING THE TECHNOLOGYUNDERSTANDING THE TECHNOLOGY

►Comparing 4-20ma, smart, and fieldbus Comparing 4-20ma, smart, and fieldbus instrumentationinstrumentation

►What Does FOUNDATION Fieldbus Do What Does FOUNDATION Fieldbus Do ►Interoperability and device descriptionsInteroperability and device descriptions

INSTALLATIONINSTALLATION CONFIGURATIONCONFIGURATION OPERATIONOPERATION

Control & MonitoringControl & Monitoring

P

L

F

Automation and

Display Systems

Fieldbus

Process Plant

What Is Fieldbus?What Is Fieldbus?

Fieldbus - a digital, two-way multi-drop communication link among intelligent measurement and control devices, and automation and display systems.

TraditionalAnalog & Discrete

Instruments

Advantages:

OPEN, interoperable, interchangeableBroad range of equipmentMultiple suppliersStandard control system interfacesStandard support equipment

Shortcomings:

Limited information- one variable, one direction

Point-to-point wiring

4-20 mA Systems4-20 mA Systems

I/O

4-20 mA

How is Fieldbus Different How is Fieldbus Different from 4-20from 4-20

4-20mA

P.S.

fieldbus

P.S.

Fieldbus devices are connected in parallel on the bus, which Fieldbus devices are connected in parallel on the bus, which carries digital data from/to all the devices on the buscarries digital data from/to all the devices on the bus

Fieldbus devices provide almost unlimited information to all Fieldbus devices provide almost unlimited information to all other devices on the network other devices on the network

Data have cyclical redundancy checking (CRC) to ensure Data have cyclical redundancy checking (CRC) to ensure receiving devices use only good datareceiving devices use only good data

A multidrop fieldbus does not have the shortcoming of point-A multidrop fieldbus does not have the shortcoming of point-to-point wiringto-point wiring

REDUCED WIRING AND INSTALLATIONFFOUNDATIONOUNDATION Fieldbus Fieldbus

BenefitsBenefits

Traditional 4-20 mA wiring,one IS barrier, one pair

for each device

4-20 mA

ISISIS IS

One IS barrier, one pairfor many devices

ISFieldbus

EXPANDED VIEW OF PROCESS

FFOUNDATIONOUNDATION Fieldbus Fieldbus BenefitsBenefits

ISISIS IS

4-20 mA

FieldbusIS

FFOUNDATIONOUNDATION Fieldbus Benefits Fieldbus BenefitsMORE INFORMATION FOR ENGINEERING AND MAINTENANCE

ISISIS IS

One Process Value

4-20 mA

ISFieldbus

Mode, Value, Status, Alarms, Trends

4-20 mA

PID

AO

AI

In today’s systems, control functions all reside in central controllers.

FFOUNDATIONOUNDATION Fieldbus Benefits Fieldbus BenefitsDISTRIBUTION OF FUNCTIONS

Fieldbus can be used in the same way, but fieldbus also enables control and I/O functions to be distributed to field instruments.

AI

ISFieldbus

AO

PID

PID

Fieldbus is the Next Fieldbus is the Next GenerationGeneration

►Fieldbus offers:Fieldbus offers: Reduced wiring and installation costsReduced wiring and installation costs Expanded view of the processExpanded view of the process More information for engineering, More information for engineering,

maintenance, and support functionsmaintenance, and support functions Distribution of control functions to field Distribution of control functions to field

devicesdevices

UNDERSTANDING THE TECHNOLOGYUNDERSTANDING THE TECHNOLOGY INSTALLATIONINSTALLATION

►ComponentsComponents►Devices on a SegmentDevices on a Segment►WiringWiring►Using Existing WiringUsing Existing Wiring►Avoiding ProblemsAvoiding Problems

CONFIGURATIONCONFIGURATION OPERATIONOPERATION

Steps in a Fieldbus ProjectSteps in a Fieldbus Project

Fieldbus WiringFieldbus Wiring

24v Nom

FieldbusPower

Supply

Terminator Terminator

Fieldbus Wire

SignalIsolationCircuit

Fieldbus Devices

Wiring and Installation Wiring and Installation ComponentsComponents

WiringWiring Junction Box, Terminal BlocksJunction Box, Terminal Blocks ConnectorsConnectors Power SuppliesPower Supplies Power ConditionersPower Conditioners Terminators Terminators Intrinsic Safety BarriersIntrinsic Safety Barriers

Several Manufacturers of Fieldbus Cable

Shielded Twisted Pair CablesShielded Twisted Pair Cables

Cable Jacket

Shield Drain Wire

Two Colors of Power/Signal Wire

Shield with 90% Coverage

Shielded Twisted Pair CableShielded Twisted Pair Cable

ToControlBuilding

(Single orMulti-Pair)(Shielded)

FieldbusTerminator

Inside Junction Box

Field Devices

Twisted Pair

(Shielded)

Shields not shown

Terminal BlocksTerminal Blocks

Fieldbus Terminal BlocksFieldbus Terminal Blocks Screw, plug, or compression (shown) terminationsScrew, plug, or compression (shown) terminations Embedded parallel wiring of same color terminalsEmbedded parallel wiring of same color terminals Embedded terminators Embedded terminators Embedded LED to show bus power ONEmbedded LED to show bus power ON

Power ConditionerPower Conditioner

►A power conditioner is a power A power conditioner is a power supply impedance matching supply impedance matching network and is requirednetwork and is required May be integral to the fieldbus power May be integral to the fieldbus power

supply or external supply or external

May contain eitherMay contain either

“traditional” inductorsor the electronicequivalent

TerminatorsTerminators A terminator is an impedance matching A terminator is an impedance matching

device used at near and far ends of a fieldbus device used at near and far ends of a fieldbus segment to prevent reflections of signalssegment to prevent reflections of signals

There should be exactly two terminators per There should be exactly two terminators per fieldbus bus segment.fieldbus bus segment.

Rule of thumb: place terminatorsRule of thumb: place terminators

► as far apart as possibleas far apart as possible

Power supply not shown

= Terminators, in J-Box

Spurs with one device are limited to 120 meters each

J-Box J-Box

Single or multi-pair cable

SpurT

T T

Wiring Two Devices on a Wiring Two Devices on a SegmentSegment

Increasing the Length of a Increasing the Length of a NetworkNetwork

TFieldbusRepeater

Fieldbus Segments

Up to 1900 meters

T

T

= TerminatorT

T

►A repeater is an active device used to A repeater is an active device used to extend the length of a fieldbusextend the length of a fieldbus

Maximum Length of a Maximum Length of a NetworkNetwork

A maximum of four repeaters can be used A maximum of four repeaters can be used between any two devices on a fieldbus networkbetween any two devices on a fieldbus network

Using four repeaters, the maximum distance Using four repeaters, the maximum distance between any two devices on the network is between any two devices on the network is 9500 meters; 31,168 feet; or 5.9 miles9500 meters; 31,168 feet; or 5.9 miles

FieldbusRepeater

FieldbusRepeater

FieldbusRepeater

FieldbusRepeater

Fieldbus Segments

Fieldbus Network - up to 5.9 miles

TTTT T T T T

T

T =Terminator

T

Wiring Using Tree TopologyWiring Using Tree Topology

T THomerun Cable

120 Meter SpurThis fieldbus includes 4 devices and 3

devices on three spurs, so maximum spur length is 120 meters (next table)

Power supply not shown

= TerminatorsT

HMIJ-Box

Total Devices On Segment

1 Device per Spur

2 Devices per Spur

3 Devices per Spur

4 Devices per Spur

25 - 32 1 m 1 m 1 m 1 m

19 - 24 30 m 1 m 1 m 1 m

15 - 18 60 m 30 m 1 m 1 m

13 - 14 90 m 60 m 30 m 1 m

2 - 12 120 m 90 m 60 m 1 m

Recommended Maximum Spur Length

Maximum Spur LengthsMaximum Spur Lengths

Cable Types / Bus Segment Cable Types / Bus Segment LengthLength

Cable Type Gauge No. Max. Length

A: Twisted-pair with ShieldH1 (31.25kbps) #18AWG 1900 m

B: Multi-twisted-pair with Shield H1 (31.25kps) #22AWG 1200 m

C: Twisted-pair without Shield H1 (31.25kbps) #22AWG 400 m

D: Multi-core with ShieldH1 (31.25kbps) #16AWG 200 m

Any existing, good quality #18 AWG twisted pair cable can be used for fieldbus.

Cable Length Cable Length CalculationCalculation

Cable Type

ABCD

H1 Total Length*

1900 m / 6234 ft1200 m / 3937 ft 400 m / 1312 ft 200 m / 656 ft

* Total length including all spurs

Terminators and power supplies not shown

Field Devices

J Box

Spur

Homerun Cable

# of Devices

25 - 3219 - 2415 - 1813 - 14 2 - 12

Total Max Spur Length**

1 m / 3 ft 30 m / 98 ft 60 m / 197 ft 90 m / 295 ft120 m / 394 ft

** Maximum length of any spur

Exceeds Maximum Spur Exceeds Maximum Spur LengthLength

No Good

T 500 m

500 m

Homerun cableTJ Box J Box

J Box

Correct InstallationCorrect Installation

T

500 m

500 m

Homerun cableT FieldbusRepeater

T TJ Box J Box

J Box

More Control with Installed More Control with Installed WiresWires

Three existing4-20 mA Pairs

J-Box

TT

Fieldbus devices

Three existingpairs, one usedfor fieldbus

J-Box

PolarityPolarity Fieldbus devices may be sensitive to polarityFieldbus devices may be sensitive to polarity Therefore, treat all devices as polarity Therefore, treat all devices as polarity

sensitive until all your suppliers say their sensitive until all your suppliers say their devices are not polarity sensitivedevices are not polarity sensitive

Fieldbus twisted pairs cables are required to Fieldbus twisted pairs cables are required to indicate polarity (color coding of conductors)indicate polarity (color coding of conductors)

Polarity should be maintained through all Polarity should be maintained through all connection pointsconnection points

GroundingGrounding Grounding rules used in the Grounding rules used in the

installation of the fieldbus should installation of the fieldbus should follow current standard practices follow current standard practices based on company/plant standards based on company/plant standards and applicable international standardsand applicable international standards

Fieldbus shield should only be Fieldbus shield should only be grounded at one pointgrounded at one point

Fieldbus devices should not connect Fieldbus devices should not connect either conductor of the twisted pair to either conductor of the twisted pair to ground at any point in the networkground at any point in the network

Shield may not be used as a power Shield may not be used as a power conductorconductor

Summary - Preparing for Summary - Preparing for FieldbusFieldbus

Select appropriate wire type and size for Select appropriate wire type and size for fieldbus applicationfieldbus application

Locate junction boxes in strategic locationsLocate junction boxes in strategic locations Power and terminate segment properlyPower and terminate segment properly Locate loop devices on one network, if Locate loop devices on one network, if

possiblepossible AvoidAvoid

► Segments and spurs that are too longSegments and spurs that are too long► Too many devices on one networkToo many devices on one network► Loop devices on more than one segmentLoop devices on more than one segment► Series wiringSeries wiring

Steps in a Fieldbus ProjectSteps in a Fieldbus Project

UNDERSTANDING THE TECHNOLOGYUNDERSTANDING THE TECHNOLOGY INSTALLATIONINSTALLATION CONFIGURATIONCONFIGURATION OPERATIONOPERATION

Definition of ConfigurationDefinition of Configuration

►Configuration is setting the control strategy Configuration is setting the control strategy and schedule, alarms, trends, and link active and schedule, alarms, trends, and link active scheduler, and downloading this information to scheduler, and downloading this information to the devices on the fieldbus.the devices on the fieldbus.

Define Control StrategyDefine Control Strategy

AI-110 PID-110 AO-110

USAGE OF FBT – 6 USAGE OF FBT – 6

ANALYSE THE SEGMENTANALYSE THE SEGMENT

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