1

An Introduction To“FIELDBUS”

2

• Control

What Should The Control System Do?

• Historian• Monitoring

3

• FCS (Field Control Systems)

• DDC (Direct Digital Control)

• DCS and PLC (Distributed Control Systems)

• Pneumatics

Evolution Of Control System Architecture

4

• The Need Of More Decentralization

• The Unique Needs Of Process

• Bus Power• Intrinsic Safety• The Ability To Communicate Long Distances

• Lack Of Interoperability

DCS & PLC Disadvantages

5

• Digital• Bidirectional (Half Duplex)

• Serial

• Multidrop

• Open (DD)• Interconnectivity

• Interchangeability• Interoperability

FIELDBUS

6

FIELDBUS Architecture• Host Level

• Linking Devices

• Field Level• Sensors• Actuators

• Linker (Coupler)• Bridge

• Controller• Engineering Tools

7

FIELDBUS Capabilities• Host Level

• Linking Devices

• Field Level• Intelligence• Redundancy

• Asset Management

• Redundancy• Advanced Control

• Redundancy

8

Solutions

• Intelligent Devices HART

• IEC& ISA

9

Speed FactorReliabilityDistance Factor

Other Groups

10

Fisher-Rosemount & EMERSONABB

11

Terminology

12

Topologies

• Bus With Spurs

• Daisy-Chain

• Tree (Star)

• Combination Off All

13

Cable Type Max. LengthA: Twisted-pair with Shield

1900 mB: Multi-twisted-pair with Shield

1200 mC: Twisted-pair without Shield

400 mD: Multi-core without Shield

200 m

Cable type versus segment length

14

• Network

CONFIGURATION

15

• Network

• Device

CONFIGURATION

16

• Network

• Device

• Control Strategy

CONFIGURATION

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1- Identification 2- Modeling3- Control Scenario4- Planning5- Installation 6- Commissioning 7- Operation

ENGINEERING & DESIGN

18

1- Choosing a Bus Standard

2- Selecting Devices

3- Designing Segments

4- Wiring (Topology)

5- Configuration

6- Documentation

PLANNING

19

FOUNDATION FIELDBUS Protocol

HART Protocol

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• How It Works?Master / Slave

• Device Type: Master

Slave Burst Mode Slave

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• Topology Point-to-Point Multidrop

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• HART Layers

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• Physical Layer (Bell 202)

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• HART Protocol Rules

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• HART Commands

26

FOUNDATIONTM Fieldbus H1 Technology Introduction

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The H1 FOUNDATION™ Fieldbus Model

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What Does FOUNDATION™ Fieldbus Do?

Fieldbus wire

Moves data from

here to there

Controls, alarms

Ensures secure

communication

Connects to the

wires here

29

H1 Physical Layer : IEC 61158-2

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H1 Communication StackData Link Layer

• Device Type• Scheduled Communication

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H1 Communication StackData Link Layer

• Unscheduled Communication

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H1 Communication StackData Link Layer

• Unscheduled Communication

• LAS (Link Active Scheduler)

• CD (Compel Data) Schedule

• Token Passing• Data Link Time Synchronization• Live List Maintenance

• LAS Redundancy

33

H1 Communication StackFieldbus Access Sublayer (FAS)

• VCR Type (Virtual Communication Relationship)

• Client / Server VCR Type

• Report Distribution VCR Type

• Publisher / Subscriber VCR Type

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H1 Communication StackFieldbus Access Sublayer (FAS)

• VCR Type (Virtual Communication Relationship)

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H1 Communication StackFieldbus Message Specification (FMS)

• VFD (Virtual Field Device)

• Communication Service

• Message Format

• Protocol Behavior

36

H1 Communication StackFieldbus Message Specification (FMS)

• VFD (Virtual Field Device)

37

H1 User Application

• Resource Block

• Transducer Block

• Function Block

• Device Descriptions

38

H1 User Application

• Device Descriptions (DD)

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H1 System Management

• Function Block Scheduling

• Device Address Assigning

• Application Clock Distribution

• Find Tag Service

40

Foundation Fieldbus H1Architecture

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• Interoperability• Greater System Functionality

• Simplicity• Accuracy

• Decentralized Function• Asset Management• Multiple Variable I/O

• Diagnostics

Fieldbus Benefits

42

• Discrete I/O and Control

• Cable breaks

• Controlling Device Fails

Fieldbus Doubts