fg25cw1 fieldbus overview pdf

8/18/2019 Fg25cw1 Fieldbus Overview PDF

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Overview of

FOUNDATION Fieldbus™FG25CW1, Version 6.0© 2008


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Seminar Logis tics

• Seminar materials

– Downloadable presentation – Question and Answer session (audio and email)

– Survey

– Earn 1 Professional Development Hour (PDH)

• Seminar length – 60 minute presentation

– Three 10-minute question and answer sessions

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Audio Instruct ions

• Please note the following during the seminar:

• As a participant, you are in a “listen-only” mode.

• You may ask questions via the internet, using your keyboard,at any time during the presentation. However, the presentermay decide to wait to answer your question until the next Q&ASession.

• If you have audio difficulties, press *0.

• If you have visual difficulties, call (866) 493-2825.


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Audio Instruct ions for Q&A Sessions

• Questions may be asked via your telephone line.

• Press the *1 key on your telephone key-pad.

• If there are no other callers on the line, the operator willannounce your name and affiliation to the audience and thenask for your question.

• If other participants are asking questions, you will be placedinto a queue until you are first in line.

• While in the queue, you will be in a listen-only mode until theoperator indicates that your phone has been activated. Theoperator will announce your name and affiliation and then askfor your question.

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Introduction of Presenter

• ISA Presenter

– Jonas Berge

– Mr. Berge is one of the architects offieldbus and has been instrumental in thedevelopment of the Foundation fieldbusspecification. Jonas is the author of thebook fieldbuses for Process Control:Engineering, Operation andMaintenance. Mr. Berge has participatedin the design and engineering of manysystem projects based on FOUNDATIONfieldbus.


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Key Benefits of Seminar

1. Know the terminology to better communicate your

requirements to vendors and customers2. Justify project to management to gain project funding

3. Learn the basics of bus design

4. Understand interoperability and device integration

5. How to integrate legacy systems and package units

6. Know the tools of the trade

7. How operators benefit from fieldbus

8. Understand the new engineering practices

9. Find out how to leverage device management

10. Know the constraints and possibilities for process availability

and control safety

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Section 1:

• Introduction

– Why technology is going digital

– Which technology goes where

• Benefits and savings – Project justification

• Design and commissioning


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Why Digi tal

• Less wiring

– Multiple devices per bus

– Multiple signals per device

– E.g. electrical actuators

• Better accuracy

– No precision lost in D/A and A/D

• High integrity

– Distortions can be detected

• More powerful diagnostics

– More current for higher processingspeed

• More information...

– Device management from controlroom or in the field

• Enables innovation...

– New classes of digital devices

• Alerts

– Predictive maintenance

• Engineering unit – Measure to sensor limits

– No range mismatch

• Firmware download

– Stave off obsolescence

CTRL

XMTR

CPU

H1

BUS

CPUH1 POS.

CPU

H1

Digital Digital Digital

CTRL AOXMTR

CPU

D/A 4 - 2

0 m A

AICPU D/A A/D

POS.

CPU

A/D 4 - 2

0 m A

Digital Digital Digital

Range

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Networked System Architecture

• Fieldbus

– 31.25 kbit/s

– Bus power

– Hazardous areas

– 1.9 km (1.2 miles)

– Transmitters and Valves

– 6-12 devices per bus

– IEC, EN, ANSI/ISA protocol

• Control network – Ethernet and UDP/IP

– Redundancy

– Controllers

Operation/Engineering

Device Management

control network

fieldbus


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Other Buses Are Not Similar to FF

• Real-time and non-real-timechannels

– PID control

• Scheduled periodic andsynchronized real-time

– PID control

• Automatic addressing

– Plug-'n'-play

• Peer-to-peer

– Control-in-the-field

• Publisher/subscriber

– Control-in-the-field• Clock synchronization

– Scheduling and time-stamping

• Alarm and event reporting

– Detect faults faster

• Firmware download

– Stave off obsolescence

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Designed for Process Control PID

• Other buses

– "Free running"

– Longer time

– Jitter

• FOUNDATION fieldbus

– Scheduling

– Synchronized

– Precisely periodic (isochronous)

M

C

A

M

A

M

A

M

A

M

C C C C

M

A A A

Difference = "Jitter"

e = PV-SPdt = sampling interval constant

dt

dPV Ddt e

I ePOUT

1

Constant Macrocycle Period

Real-time Periodic Foreground Slots

Non-real-time Non-periodic Background Slot

No Acyclic A lot of Acyclic Some Acyclic Messages

Valve

Transmitter

Controller

M

C

A

M

C

A

M

C

A


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Device Integration:

Electronic Device Description Language

• EDDL is a text file describing how to interact with device

– Tells host software how to communicate data – Tells host software how to decode information

– Tells host software how to display information

– Interactive methods such as calibration or advanced setup

• One file for every version of every type of device from everymanufacturer

• Not a driver program, more like a web page

0010011011010000100111010010

HI_HI _LIM= 100

EDDL

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Standards-Based Interoperability

• Devices from different manufacturers work together – Same standard protocol

• Devices and software are tested and verified for compliance – ITK (Interoperability Test Kit),and

– HIST (Host Interoperability Test Kit)

Tester


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Regular Bus Design

• Device power requires powersupply impedance

• Spurs hook devices to trunk

• Trunk-ends are terminated

• Also used for flameproof(explosion) proof

• Lots of different wiring hardwareavailable

• Different topologies possible

– Bus, tree, mixed

• Spurs max 120 m (400 ft)

• 6-12 devices per bus

– Voltage drop

– Bus cycle time

• Zone 2 (Division 2)

– ExnA trunk

– ExnL (non-incendive) spursusing limiters

• Ground shield in power-end, notat devices

Terminator

Device management software

Power andTerminator

Trunk

Spur

Junction BoxController

Control network

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Intrinsically Safe Bus (Exi)

• Barrier used in place of conditioner

• Barriers can be field mounted

ia ib

IIB

(C)

5.3 W

(13 devices)

IIC

(A, B)

1.9 W

(5 devices)

2.5 W

(6 devices)

Max Power Available

Terminator

Device management software

Power andTerminator

Trunk

Spur

Controller

Control network

Safety Barrier


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High Power Trunk (Field Barrier/Limiter)

Solutions

• Field mounted barrier

– Exe trunk Exia spurs

• Field mounted limiter – ExnA trunk ExnL spurs

– Zone 2 only

• No live work on trunk

• Spurs can be worked livewithout affecting trunk

• Redundant power

• One device per spur

• More power to the field – 4*4=16 devices

Zone 1 (Division 1)

Zone 0(Division 1)

Zone 0(Division 1)

Zone 0(Division 1)

Controller

Device Management Software

Exe

Control network

Junction BoxBarrier

Junction BoxBarrier

Junction BoxBarrier

Power

Power

Exia

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Review of Key Points - Section 1

• Digital communication has advantages over analog signals

• Devices measuring or actuating in PID loops shall useFOUNDATION fieldbus

• Fieldbus and Ethernet complement each other

• Suitable for hazardous areas

• Long distance

• Host interoperability through EDDL

• Buy registered devices

• Many options for instrument wiring – Regular, Exd, Exi, Exe/Exi, ExnA/ExnL


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Live Question and Answer Session 1

• During Q&A, questions may be asked via your telephone line.

• Press the *1 key on your telephone key-pad.• If there are no other callers on the line, the operator will

announce your name and affiliation to the audience and thenask for your question.

• If other participants are asking questions, you will be placedinto a queue until you are first in line.

• While in the queue, you will be in a listen-only mode until theoperator indicates that your phone has been activated. Theoperator will announce your name and affiliation and then askfor your question.

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Section 2:

• Device parameterization

• System integration – Legacy DCS and package unit integration

• Troubleshooting – Tools of the trade at your disposal


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Device Commissioning and Replacement

• Commissioning wizard

• Replacement wizard• Live list

• Automatic address assignment

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Device Transducer Parameterisation

• Transducer blocks handle device specific aspects – Pressure, temperature, level and valve etc.

• Interface between hardware and control strategy

• Independent of control strategy

• Calibration, Diagnostics, etc.

• From the same tool used for bus configuration and controlstrategy programming

D/

ATRD

A/D

AO


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Function Block Diagram Language

• FOUNDATION Fieldbus standardfor visually programming controlstrategies: IEC 61804-2

• Possibly decentralized acrossfield devices

• Large set of standard blocks plusenhanced and custom

– AI, AO, PID, DI, DO, AALM, ARTH, etc.

• Independent of device hardware

• Standardized parameters

• Status propagation for shutdown...

External link (communicated) Internal Link

Transmitter Positioner

Input

Output

AI PID AO

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Control in the Field

• Advantages:

– Fewer links: faster

– Single loop integrityneed no controllerredundancy

Valve:1 External Link

Transmitter

Valve

AI PID AO

Transmitter:2 External Links

Valve

Transmitter

AI PID AO

Controller:3 External Links

Transmitter Valve

Controller

AI PID AO


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Legacy System Integration and

Package Unit Integration

• Connect Fieldbus devices to legacy DCS

– Configure devices and control strategy from web browser

– Manage devices from independent workstation

• Evaluate Fieldbus technology starting small

• Multiple interface module can be networked

Web Browser

Configuration

Device Management

Software

Legacy DCS

Operator Console

Modbus/RTU

Legacy DCS controller

HTTP HSEModbus/TCP, OPC

RS485

Ethernet

Fieldbus Interface Module

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Troubleshooting Tools

• Engineering tools havediagnostics functions e.g. “livelist”

• Clear indication of failedcommunication

• Parameters and status forcontrol strategy debug

• Specialized testers

– Voltage, terminators, signal,noise, device count


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• Integrated bus configuration, device parameterisation and

control strategy programming• Fieldbus integrates with legacy systems and package units

• Invest in easy to use troubleshooting tools

• Standard programming language for control strategies

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• If other participants are asking questions, you will be placed intoa queue until you are first in line.

• While in the queue, you will be in a listen-only mode until the

operator indicates that your phone has been activated. Theoperator will announce your name and affiliation and then askfor your question.


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Section 3:

• Engineering and design

– Changed engineering practices and standards• Maintenance and device management

– Leverage predictive device diagnostics and device managementsoftware for more effective maintenance scheduling

– Changed work practices

• Availability and safety – Make control system layer fault tolerant and safer

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P&I Diagram

• Fieldbus is represented as dash-dot-dash where the dash isfilled

• Show data flow, not bus wiring

• Consider grouping bubbles as per device

Proposed fieldbus Symbol (Filled)

Data Link Symbol (Empty)

FT

LC

LT

FTFC Y


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Predictive Diagnostics and Performance

Analysis

• Capture device self-diagnostics remotely and detect faults

immediately• Pin-points problem making repair faster

– Actionable information

• Eliminate unnecessary preventive maintenance of OK device

• Focus maintenance efforts where really needed: – Based on actual condition

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BPCS Layer Availabil ity and SafetyBasic Process Control System

• Fault detection:

– Bad status on sensor failure, device failure, communication failure, etc.

• Function block language has lots of status options forbalancing availability and safety – Fail-safe or last etc.

• Backup LAS (Link Active Scheduler)

• Future FF-SIS will enable Fieldbus in SIS (Safety InstrumentedSystem)

AI PID AO

BAD Man Fail Safe


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Benefits and Project Justification

• User Benefits

– Measurement validity (Good/Bad/Uncertain) – Limit information (Low/High/Constant)

– Finer granularity diagnostics

– Intelligent device management

– Centrally or in the field

• Owner Benefits – Greater availability

– Predict faults

– Higher quality

– Eliminate sources of variability

– Lower maintenance cost

– Reduce preventive maintenance

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Tackle Differences

• Work practices

– To benefit from predictive diagnostics

• Engineering standards and forms – To get a good fieldbus solution

– Makes the difference between success and failure

• System/instrument boundary – Responsibilities

• Management of Change – Integrity

• Build internal, EPC1, and contractors skills

– Competence in Foundation Fieldbus

1. Engineering, Procurement, and Contracting; sometimes called Architects and Engineers


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• Operational savings come from predictive diagnostics and

intelligent device management• Some changes to engineering documents and standards

• Changes to operation and maintenance work practices

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How Many People Are at Your Site?

• Poll Slide

• Click on the appropriate number indicating the number ofpeople that are at your site.


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• If other participants are asking questions, you will be placed intoa queue until you are first in line.

• While in the queue, you will be in a listen-only mode until theoperator indicates that your phone has been activated. Theoperator will announce your name and affiliation and then ask

for your question.

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Related Courses from ISA

• Overview of FOUNDATION fieldbus Technology(FG25C)

• Picking the Right Bus - A Comparison of Field andDevice Networks (FG30C)

• Industrial Data Communications Part I (TS05)

• Industrial Data Communications Part II (TS10)

• All ISA courses are available any time as on-site training

• For more information: www.isa.org/training or(919) 549-8411


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Other Related Resources from ISA

• Fieldbuses for Process Control - Engineering, Operation andMaintenance by Jonas Berge from ISA Press

• The ANSI/ISA50.02, Part 2-1992 - fieldbus Standard for Use inIndustrial Control Systems Part 2: Physical Layer Specification

and Service Definition standard

• The Consumer Guide to Fieldbus Network Equipment forProcess Control by Dick Caro, available from ISA Press

• ISA Membership is just $100 per year, which includes freemembership in two Technical Divisions (a $20 value) - onefrom each Department: Automation and Technology andIndustries and Sciences.

– For more information: http://www.isa.org/membership/meminfo or(919) 549-8411

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ISA Certifications

• Certified Automation Professionals™ (CAP™)

– www.isa.org/CAP

• Certified Control Systems Technician® (CCST®) – www.isa.org/CCST

• Please visit us online for more information on any of theseprograms, or call (919) 549-8411.


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