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By Rajesh S

March 16th 2012 Friday

Introduction toFOUNDATIONTM FIELDBUS(FF)

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FOUNDATION FIELDBUS

Two-way digital communications systemdesigned for interconnecting smart fielddevices and control systems.

Control/Monitoring functions on fieldmounted devices.

High speed

H1 31.25 Kbit/s HSE 100 Mbit/s

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HART Vs Fieldbus

HARTUses 4-20mA signal. Speed - 1200 bps

Ability to provide diagnostics for the device only ,

has no knowledge of other devicesPoll - HART status periodically

Multidrop 15 devices but slow.

Field bus:Advanced diagnostics - Eg: Process Monitoring and

Machinery Health monitoring.

Push - with events latched and time stamped in thedevice and sent to device. 03:56:55 PM33


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Advantages of FieldbusFoundationInteroperability with other Field bus

device.

High speed

Advanced Diagnostics

Types

H1 31.25 Kbit/s interconnects field

equipment such as sensors, actuatorsand I/O.

HSE 100 Mbit/s High speed Ethernet

provides integration of high speedcontrollers.03:56:55 PM4

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OSI Model Vs Fieldbus Model

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Fieldbus Model

User Layer: Function Blocks Network Management (NM) System Management (SM)

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Fieldbus Model

Application Layer:

Fieldbus Message Specification (FMS) Messagestructure

Fieldbus Access Sub layer provides virtualcommunication channel , Addresses.

Data Link Layer

Error coding, parity checking.

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HSE Device Types

Linking device Links H1 networks to theHSE network.

Ethernet device Execute function blocksand may have some conventional I/O.

Host device - an operator workstation or anOPC server.

Gateway device (GD) - interfaces other

network protocols such as Modbus, DeviceNet or Profibus

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HSE Device

FDA Agent

HSE System Management Kernel(SMK)

HSE Network Management Agent

(NMA) Virtual Field Device (VFD)

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Field Device Access (FDA)

Convey SM services over UDP

FMS Services over UDP/TCP

Allows HSE and H1 field devices,

conventional I/O devices, and non-FF I/Odevices to be connected to the HSEthrough a linking or a gateway device.

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HSE System Management

Integrates devices on an HSE network intoa coherent communication system

Unique, permanent identity for device

Maintains version controlFunction block schedules

Devices added/removed without affecting

other devices

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HSE Network Management

HSE host systems to conduct managementoperations over the HSE network with theirassociated devices with an HSE interface.

Configuring the H1 Bridge

Loading the HSE Session List

HSE Session Endpoint Logical communicationchannel

Loading the HSE VCR List communicationrelationship used to access VFDs.

Fault Detection Monitoring.

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FDA Components

FDA Session

An application relationship used forrequest/response, publisher/subscriber.

Identified by their source and destinationendpoint addresses (IP addresses plus UDP/TCPport numbers)

FDA Agent

Entity within an HSE Device - uses the servicesprovide HSE access to VFDs and SMKs (WithinHSE device or other H1 devices)

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FDA Agent

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Application Processes (AP)

Application Processes (AP)

Entities within devices that perform arelated set of functions, such as functionblock processing, network management, and

system management

Function Block Application Processes(FBAP)

Automated manufacturing and processcontrol systems perform a variety offunctions

Range of functional models, each addressing

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Virtual Field Devices (VFDs)

Network visible objects of an ApplicationProcess

Descriptions of network visible objects arecontained within the Object Dictionary(OD) within the VFD.

OD :

composed of a series of entries, each

describing an individual object and itsattributes.

OD entries are assigned an index which isused to obtain the description of the object

from the OD. The OD index is also used to03:56:57 PM1616


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Virtual Field Devices (VFDs)

Virtual Communication Relationships

Network visible objects are accessible

through VCRs using FMS ServicesCommunication relationship to access VFDs

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Few SM and FMS services

SM Device Annunciation andAssignment

SM Device Identification

SM Tag QueryFDA Open Session

FMS Initiate

FMS Abort

FMS GetOD

LAN Redundancy Get

information

Header

Service-Specific Parameters + User

Data (optional)Trailer (optional)

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More on NextSession

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Thank You

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