Fieldbus comparision by dnyaneshsd1

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									Fieldbus Foundation™
Freedom to choose. Power to integrate

Fieldbus Comparison

Developed by: William Woo 3/19/2005

2005 General Assembly

All Buses Are Not “Fieldbus”

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Many buses used in plants are being called “fieldbus”, creating confusion. There are several types of buses, designed for different devices and uses- “sensor buses”, “device buses”, “local area networks”, etc. The term “fieldbus” properly applies only to buses with technical correspondence to the IEC/ISA SP50 fieldbus standard, such as FOUNDATION fieldbus. FOUNDATION fieldbus now an approved member of the physical layer standard IEC 61158-2, which includes other protocols.

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Copyright Fieldbus Foundation, February 2005

Plants Have Different Networks for Different Devices
10,000 Bytes One bus type cannot serve all applications and all device types efficiently. Data Networks

1000
Simple sensors, actuators $ (low cost connection) Non bus powered 100 Short messages (bits) Fixed configuration Not intrinsically safe Twisted pair Max distance 1600’

Sensor Bus

Workstations, robots, PCs $$$ (higher cost connection) Not bus powered Long messages (e-mail, files) Not intrinsically safe Coax cable, fiber Max distance miles

Honeywell

PV 6000 SP 6000

AUTO 1

HSE- High Speed Ethernet H1- Low Speed Fieldbus
PLC, DCS, remote I/O, motors $$ (medium cost connection) Non bus powered Messages: values, status Not intrinsically safe Process instruments, valves $$ (medium cost connection) Bus-powered (2 wire) Messages: values, status Intrinsically safe Twisted pair (reuse 4-20) Max distance 5200’

10

Message

10ms

100ms

1s

10s Freq

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Copyright Fieldbus Foundation, February 2005

•Types of Fieldbuses

Device Device Configuration Configuration

Power Supply/ Power Supply/ Conditioner Conditioner I/O Subsystem I/O Subsystem

Controller Controller

CONTROL ROOM CONTROL ROOM FIELD FIELD HART HART Multiplexer Multiplexer 4-20 mA 4-20 mA

1.1Kb 1.1Kb

Smart Smart Transmitters Transmitters

Smart Smart Valve Positioners Valve Positioners

HART System

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Copyright Fieldbus Foundation, February 2005

•Types of Fieldbuses
Master/Slave Master/Slave

Host Host (Master) (Master) Power Supply/ Power Supply/ Conditioner/ Conditioner/ Terminator Terminator Interface Interface

CONTROL ROOM CONTROL ROOM FIELD FIELD

Field Field Devices Devices (Slaves) (Slaves)

Terminator Terminator
No Field-level No Field-level Control Control

PROFIBUS-PA
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•Types of Fieldbuses

Hosts/HMIs Hosts/HMIs

Terminator Terminator

Power Supply/ Power Supply/ Conditioner Conditioner

CONTROL ROOM CONTROL ROOM FIELD FIELD

Field Field Devices Devices

Terminator Terminator

FOUNDATION™ Fieldbus System
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Basic Capabilities of FOUNDATION Fieldbus

HSE: High Speed Ethernet
• Integrates up to 32 H1 fieldbuses • 750/500 m, comm. grade twisted pair req’d • Supports PLC’s and manufacturing devices • Can integrate other buses (e.g. SDS)
Control Module Control Module PLC

Bridge

H1: Lower Speed Fieldbus (31.25 kbps)
• Power & Communications on same wires • Intrinsically Safe for hazardous areas • 1900 m, comm. grade twisted pair • Can use existing 4-20mA wires • Primary bus for process devices • First fieldbus products will be H1
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Copyright Fieldbus Foundation, February 2005

Analyzer

How Does H1 Fieldbus Compare to 4-20 mA?
D = Device T = Terminator R = Repeater T PS = Power IS = Barrier/ Galv. Isolator

DCS
Segment 1 PS

Spur

D

D
T

D
Segment 2 T R PS

Coupler (Splice)

(if present)

IS

D D Similarities • Twisted pair carries power and signal. • Existing 4-20 mA wire can be used, though communication wire is preferred. • Familiar process devices (transmitters, valves, etc.) can be connected. • Intended for use by instrument technicians, not communications experts. Differences • Multiple transmitters and valves can be connected to one wire pair. • Devices are connected in parallel, not serial. • Electronics in all devices are different. • Terminators (R-C circuit) are required to “nail down” each bus segment. • A fieldbus can have multiple segments, interconnected by repeaters.
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Copyright Fieldbus Foundation, February 2005

FOUNDATION Fieldbus Differentiators
• Supports Intrinsic Safety and Existing Wiring – Uses IEC/ISA fieldbus standard. • Deterministic Process Data Messages – Separates time-critical process data from background MMI messages, downloads, etc. – Uses IEC/ISA fieldbus standard. • Function Blocks – Standard Set (AI, AO, DI, DO, PID, ML, SS, ...) – Modeled after DCS points. – Supports distribution of control to field devices. • Device Description Language (DDL) – Defines which Function Blocks are in a device. – Provides interoperability between devices & Host System. • Supported by all major global controls suppliers
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Copyright Fieldbus Foundation, February 2005

HART and FF Comparison Some additional differences and similarities:
Function/Feature Device Status, condition, and diagnostic reporting Secondary variables/ Multivariable device support Remote device configuration and data access DDL (Device Description Language) support Device database (ID, revision, materials, etc.) Field control with peer-to-peer communications between devices on the same network Standard function blocks for field control and enhanced measurement Level of complexity (installation, implementation, training, life cycle) HART Yes Yes Yes Yes Yes No No Simple
20 mA4 mA4-20 mA is available real time

FF Yes Yes Yes Yes Yes Yes Yes More complex
FOUNDATION™ Fieldbus

FF - Shown proven benefits to customers !
Asset diagnostic information for predictive maintenance High payback and potential for loss prevention

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Copyright Fieldbus Foundation, February 2005

HART and FF Comparison

HART

FF

Supported by HART Communication Foundation Over 12 Million in service Approx 500 devices qualified Over 110 vendors

Supported by Fieldbus Foundation Approx 500,000 in service Approx 140+ devices qualified Over 100+ companies supporting

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What is the difference between the Fieldbus Foundation’s FOUNDATION Fieldbus and other “fieldbus” specifications?
TM

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HART,FF H1 and Profibus PA Comparison
HART
Digital 4-20 mA Intrinsically safe 2-wire Multidrop Speed Poll-response Publisher-subscriber Report distribution Function block links Standard parameters Alarms Trending Time synchronization Scheduling Automatic addressing Y Y Y Y Y 1.2 kbit/s Y N N N Y N N N N N

Foundation™ H1
Y N Y Y Y 31.25 kbit/s Y Y Y Y Y Y Y Y Y Y

PROFIBUS PA
Y N Y Y Y 31.25 kbit/s Y N N N Y N N N N N

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Only the FOUNDATION Fieldbus has a comprehensive USER LAYER!
TM

PROFIBUS WorldFIP DeviceNet ControlNet SDS ASi etc. FOUNDATION™ Fieldbus
Physical Data Link Layer Layer Application Layer
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Copyright Fieldbus Foundation, February 2005

Only the FOUNDATION Fieldbus has a comprehensive USER LAYER!
TM

PROFIBUS WorldFIP DeviceNet ControlNet SDS ASi etc. FOUNDATION™ Fieldbus
Physical Data Link Layer Layer Application Layer User Layer
2005 ASEAN workshops Singapore, Kuala Lumpur, Jakarta, Bangkok
Copyright Fieldbus Foundation, February 2005

Only the FOUNDATION Fieldbus has a comprehensive USER LAYER!
TM

PROFIBUS WorldFIP DeviceNet ControlNet SDS ASi etc.

Function Blocks “Mode” “Status” Cascade Value & Alarm Initialization Resource Support Files Device Description Trend Language Support Views

FOUNDATION™ Fieldbus
Physical Data Link Layer Layer Application Layer User Layer

“Interoperability!”
Copyright Fieldbus Foundation, February 2005

2005 ASEAN workshops Singapore, Kuala Lumpur, Jakarta, Bangkok

Why Choose FF? • FF is Open Standard! • FF is Interoperable! • FF is Feature Rich! • FF is Freedom To Choose!
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Copyright Fieldbus Foundation, February 2005


								
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