Field Device Specification for the Development of Function Block Oriented Engineering Support Systems Authors: Prayati, A., Thramboulidis, K. Electrical

Field Device Specification for the Development of Function Block Oriented Engineering Support Systems

Authors: Prayati, A., Thramboulidis, K.

Electrical & Computer Engineering University of Patras

GREECE

slide 2

IPMCS application development process Field device specification – current

status Engineering support system - field

device model requirements Field device model Case study: wrapping a Profibus device Conclusions

Overview

slide 3

Overview

IPMCS application development process

Field device specification – current status Engineering support system - field device

model requirements Field device model Case study: wrapping a Profibus device Conclusions

slide 4

Traditional IPMCS Development

Industrial process measurement and control systems.

Industrial control based on traditional monolithic applications impossible to integrate and to expand.

Proprietary solutions: Siemens, echelon etc. Need

Modularity Flexibility Extensibility Reusability Interoperability

slide 5

The Function Block Concept

Algorithms

Type name

Internal data

Data outputsData inputs

Event outputsEvent inputs

Instance name

ControlExecution

Data flow

Event flow Event flow

Data flow

Introduced by IEC61131 Modified by IEC61499

Resource Block Transducer Block Function Block View Block Trend Block Alert Block

slide 6

FB-based IPMCS Application

Event flow

Data flow

Processinput

Processoutput

Composite FBElementary FB

slide 7

IPMCS Development ProcessWith Engineering Support System

slide 8

Overview




slide 9

Current Status (1)

HART DDL 4-20ma point-to-point communication. Concepts: methods, variables, variable

commands, parameter (dependencies).(+) Interpretable (human-readable format).(+) Parameter dependencies provide robustness.(-) Limited application area.

NOHA Textual device description. Concepts: functional unit with data flow.(+)Flexibility, cost, maintenance, connectivity,

safety, reliability.(-) No events

slide 10

Fieldbus foundation(+) FB-based application description(-) No details regarding the mapping to the

real device Profibus

(+) FB-based device profiles(-) Profibus specific format-GSD file with

detailed device description Lonworks

(-) Lonworks specific format-XIF file with detailed device description

Current Status (2)

slide 11

The IEC61499 FB-based device model

Communication link(s)

Resource x

Controlled process

Resource zResource y

Application BApplication C

Application A

Device boundary

Communication interface(s)

Process interface(s)

= Data & event flow

IEC61804 for the development of the ESS

slide 12

Overview




slide 13

IPMCS Development ProcessWith Engineering Support System

slide 14

4-layer architecture for IPMCS development

slide 15

ESS functionality

Insert industrial process parameters in the application layer

Design the application (FB diagram) Insert field devices in the system layer Design the system (device diagram) Verify the application Download the application

slide 16

IPMCS Development Process Using ESS

Add FB

ImportFB Type

FB Type

Repository

ESS

Device Type Repository

ImportDevice Type

XML file

IUIU

Application Layer

System Layer

FB1

FB2

FB3

FB4

nodeFieldbus B

Fieldbus A Backbone

IPT

Real world Layer

D1

D2

D3

slide 17


Connect FB

ImportFB Type

FB Type

Repository

ESS


ImportDevice Type

XML file

IUIU

Application Layer

System Layer

FB1

FB2

FB3

FB4

nodeFieldbus B

Fieldbus A Backbone

IPT

Real world Layer

D1

D2

D3

slide 18


Set time constraints

ImportFB Type

FB Type

Repository

ESS


ImportDevice Type

XML file

IUIU

Application Layer

System Layer

FB1

FB2

FB3

FB4

nodeFieldbus B

Fieldbus A Backbone

IPT {Time constraints}

Real world Layer

D1

D2

D3

slide 19

Add device

ImportFB Type

FB Type

Repository

ESS


ImportDevice Type

XML file

IUIU

Application Layer

System Layer

FB1

FB2

FB3

FB4

node

D1 D3 D2Fieldbus B

Fieldbus A Backbone


Real world Layer

D1

D2

D3


slide 20

Assign FB to device

ImportFB Type

FB Type

Repository

ESS


ImportDevice Type

XML file

IUIU

Application Layer

System Layer

FB1

FB2

FB3

FB4

node

D1 D3 D2Fieldbus B

Fieldbus A Backbone


Real world Layer

D1

D2

D3


slide 21

Set Configuration ParametersDownload FB to device

ImportFB Type

FB Type

Repository

ESS


ImportDevice Type

XML file

IUIU

Application Layer

System Layer

FB1

FB2

FB3

FB4

node

D1 D3 D2 Fieldbus B

Fieldbus A Backbone


Real world Layer

D1

D2

D3


slide 22

Field Device Requirements

IEC61804 Connections implemented by the

appropriate experts group IEC61499

Communicated signals: data/event in the Resource boundary.

Time-criticality is not considered. Option for defining and downloading new FB Option for defining fieldbus specific

parameters

slide 23

Overview




slide 24

Field Device Model

Network Interface

Device

Application Management

EntityFB

Resource

Connections

Industrial Process Interface

Connection Points

FB

slide 25

Downloaded FB

Event Type

DataType

EventConnection

Predefined FB

User Defined Parameter

NameValueSlaveDomainSubnet

Device Type

1..*1..*

ConnectionPoint

Connection

sourceDestination


1..*1..*

Network Interface

NodeAddressProtocol

Resource

Item

FB Type

Application Management Entity

Device

SerialNoDeviceID

1..*1..*

1..*1..*

DataConnnection

Event Item

Function Block

Data Item

rangeunits

Field Device Model

slide 26

Add device Connect device/ set

configuration parameters Set device parameters

(parameter name, value)

Field Device API for ESS functionality

Application DevelopmentPhase

Engineering Tool

(Compiling)

Refined Device modelMachine-readablerepresentation

Machine Level

User Defined Parameters- Name : undefined- Value : undefined

Device Type- Name : undefined

1..*1..*

ConnectionPoint- Type : Input,Output- Analog : boolean- RangeSamplFreq : undefined- TimeForBroadcast : undefined

Resources- ResourceID : undefined

+ SetID()+ ConnectFB()+ CreateFB()+ DeleteFB()+ StartFB()+ StopFB()+ CreateResource()+ DeleteResource()+ StartResource()+ StopResource()

Network Interface- Devstatus : undefined- NodeAddress : undefined- Protocol : undefined- OperationMode : undefined


1..*1..*

Process Unit

+ Configure()+ Init()+ DNLFB()

Device- SerialNo : integer

+ SelfTest(Devstatus)+ CheckDeviceID()+ UniqueTag()+ SetDeviceTag()+ GetDeviceTag()+ SetAddress()+ GetAddress()+ GetStatus()+ ClearAddress()+ ReadData()+ WriteData()+ GetFBType()+ SetConnection()+ GetConnection()+ SetFbinTask()+ NewDataType()+ NewTask()+ RetrieveDefaultConfig()+ ReadAvailableFB()+ readActiveFB()+ SetUserConfig()+ SetVendorConfig()+ InitParam()

1..*1..*1..*1..*

1..*1..*

<?xml version="1.0" encoding="UTF-8"?><!ELEMENT DataType(Identification?,VersionInfo+,CompilerInfo?,ASN1Tag?,(DirectlyDerivedType|EnumeratedType|SubrangeType|ArrayType|StructuredType))><!ATTLIST DataType Name CDATA #REQUIRED Comment CDATA #IMPLIED><!ELEMENT VersionInfo EMPTY><!ATTLIST VersionInfo Organization CDATA #REQUIRED Version CDATA #REQUIRED Author CDATA #REQUIRED Date CDATA #REQUIRED Remarks CDATA #IMPLIED><!ELEMENT ASN1Tag EMPTY><!ATTLIST ASN1Tag Class (UNIVERSAL | APPLICATION | CONTEXT | PRIVATE) #IMPLIED Number CDATA #REQUIRED><!ELEMENT CompilerInfo (Compiler*)*><!ATTLIST CompilerInfo header CDATA #IMPLIED classdef CDATA #IMPLIED>

User Level

Electronic DeviceDescription in XML

Device Proxy/wrapper

Engineering Tool

slide 27

Assign FB to device downloadFB (FB type) establishEventConnection

(FBout, FBin, output event, input event)

establishDataConnection(FBout, FBin, output data, input data)

setIPTConnection(FB handle, input data/event, IPT entry)

IU : update table (data, event) Set time constraints

setTimeBound

FD API for ESS functionality (2)

Application Layer

FB1

FB2

FB3

FB4

IPT{Time constraints}

IUIU

System Layer

node

D1 D3 D2Fieldbus B

Fieldbus A Backbone

Device Proxy or WrapperFB Table

FB4 Device Proxy or Wrapper

FB Table

FB2D1 D3 D2

slide 28

Overview

IPMCS application development process Field device specification – current status Engineering support system - field device

model requirements Field device model Case study: wrapping a Profibus

device Conclusions

slide 29

The Proposed Model Implemented on Profibus

IU

Profibus driver to DP deviceDRAM

VirtualField

Device

ProfibusDevice

VFD API

ProfibusAPI

slide 30

Conclusions

4-layer architecture and FB construct very helpful for:

Capturing the key abstractions for ESS analysis Addressing complexity of distributed IPMCS

Our model enables the engineer to: Exploit FBs provided by smart devices Assign functionality to legacy Field Devices

Common field device model provides modularity, flexibility, extensibility, interoperability, reusability

this work will help to the direction of developing interoperable IEC 61499-compliant ESSs

slide 31

Device Model for the Development of IPMCS with ESS

Heterogeneous Systems

User Layer(2000)

Function Block

Interoperability

Standards

Fact

Need

Concept

Distributed Application design

Automation

IEC61804(1992)

ESS tool requirements

Industrial Networks

Real-timeliness

Real-time constraints

DifferentManufacturer devices

Common device Description representation

HARTFFoundation

NOHAProfibus

LONWORKS

Device modelFieldbus specific

Different fieldbus devices

Common devicedescription

IEC61499(1990)

Device model requirements

General Device model based on FB used by ESS tool for automated application design

slide 32

IEC61804 Device Model

VirtualFieldbus

+ AddDevice()+ RemoveDevice()+ IdentifyDevice(PhysicalTag, NodeAd)+ FindTag()+ Configure()+ PublishTime(App, Link)+ GetDeviceStatus()+ ConnectFB()+ CreateDataType()+ DeleteDataType()+ CreateFB()+ DeleteFB()+ StartFB()+ StopFB()+ KillApp()

Item

- range : undefined- units : undefined- offsetOfVar : undefined- name- limitThreshold : float- ValidityIndex : boolean

+ read()+ write()

Revision

- DeviceProfile- accessPermission- StaticDataWriteLock

+ SetDeviceProfile()+ SetAccessPermission()+ SetDataWLock()

Identification

- CompPartNo : integer- Materials : string- SWVersion : string- HWVersion : string- WorkRange : undefined- RevisionNo : undefined- manufacturerNo : undefined- ModelNo : undefined- InstallationDate : undefined- PhysicalTag : undefined

+ NewTag()+ ChangeTag()+ UniqueTag()

Configuration

- range : undefined- offset/Eng. units : undefined- warningLevel : undefined- alarmLevel : undefined- samplingFreq : undefined- FilterTimeCt : undefined

+ RetrieveDefaultConfig()+ ReadAvailableFunctions()+ readActiveFunction()+ readConfigRevision()+ SetUserConfig()+ SetVendorConfig()

ItemType Device

- typeName : string- Name : string- Devstatus : (Available,Degrated,OutOfSrv)- NodeAddress : undefined

+ PowerOnTest(Devstatus)+ RunTimeTest(Devstatus)+ SetPhysicalTag()+ SetAddress()+ ClearAddress()+ FBStart(BlockTag)+ FBStop(BlockTag)+ Read()+ Write()+ NewDataType()+ GetDataType()+ GetFBType()+ GetConnection()+ GetVariable()

0..* 10..* 11..* 11..* 1

1..*

1

1..*

1

1

1

1

1

1..*

1

1..*

1

1

1..*

1

1..*

InitParameters

1

1..*

1

1..*

slide 33

IEC61499 Device Model

FBType

Device

- Name : undf ined

+ CreateRes()+ InitRes()+ StartRes()+ StopRes()+ DeleteRes()+ Query Res()

Application System 0..*1 0..*11..* 11..* 1

ResParameters

- Name : undef ined- Ty peName : undef ined- DataTy pe : undef ined- Init : undef ined

ResEventConnection

- Source : undef ined- Destination : undef ined- ResEv entTy pe : undef ined

ResDataConnection

- Source : undef ined- Destination : undef ined

ResFunctionBlock

- Name : undef ined- Ty pe : undef ined- Init : undef ined

FBTypeResourceType

- MaxDataCon : undef ined- MaxEv entCon : undef ined- PAccessPath : undef ined- RequiredExecTime : undef ined

1..*

1

1..*

1

1..*

1

1..*

1

1..*

1

1..*

11..*

11..*

1

1

1..*

1

1..*ItemTy pe

1 1..*1 1..*

FunctionBlock

- Name : undef ined- Ty peName : undef ined- Init : undef ined

Parameters

- Name : undef ined- DataTy pe : undef ined- Init : undef ined

EventConnection

- Source : undef ined- Destination : undef ined- Ev entTy pe : undef ined

DataConnection


FB

- Name : undef ined- Ty peName : undef ined- Init : undef ined

DeviceType

- Ty peName : undef ined11..* 11..*

1..*

1

1..*

1

1..*

1

1..*

1

1..*

1

1..*

1

ResInstDataCon


ResInstEventCon


Resource

- Name- Ty peName- PAccessPath : undef ined

+ CreateItem()+ CreateFB()+ CreateCon()+ InitItem()+ InitFB()+ InitCon()+ StartItem()+ StartFB()+ StartCon()+ StopItem()+ StopFB()+ StopCon()+ DeleteItem()+ DeleteFB()+ DeleteCon()+ Query Item()+ Query FB()+ Query Con()

1..*1 1..*1

1..*1 1..*1

1..*

1

1..*

11..*

1

1..*

1

slide 34

ESS functionality (1)System Requirements

Extract functionality

Extract Data/Control signals

Select FB from library

Connect Data/Event of FBs

Set Time Constraints

Assign FB to Resource

Select Device from Library

Implement Connections

Download FBSet Configuration Prms Get Device Description

Extract FB typesFBType

Device Type

Real-world layerSystem layer

Application Layer

Extract Device Type

slide 35

Identify device Self test (test parameters) Get configuration (parameter) Write data(FB handle, input event, data index)

VFD API for Run-time operation

slide 36

Ev ent Ty pe

DataTy pe

Ev entConnection

User Def ined Parameter

BusParametersSlave/MasterDomain

SetParameterValue()

Dev ice Ty pe

Profibus

ConnectionPoint

DataTy peTy peOf Transportindex

Connection

sourceDestinationQuality

SetConnection()GetConnection()SetTimeBound()

Transducer Block

Network Interface

NodeAddress : undef inedProtocol : undef inedOperationMode : undef ined

GetAddress()SetAddress()ClearAddress()

Resource

ResourceID : undef ined

Conf igure()Init()SetResourceID()StartResource()StopResource()SetFBinRes()

Item

Av TrRate : undef inedMaxTrRate : undef inedPolling : booleanPacketLength : Integer

FB Type

Device

Prof ileNrDev iceID

SetDev iceTag()Retriev eDef aultConf ig()ReadAv ailableFB()SetConf ig()SetFBConnection()

DataConnnection

Event Item

Ty pe : undef ined

SetActiv eLev el()

Data Item

range : undef inedunits : undef inedindexinFB

InitData()SetRange()SetOf f set()SetAlarmLev el()SetWarningLev el()

Function Block

priority : undef inedSchedulingTurn : undef inedFBID : undef ined

SetScheduling()SetTimeBound(Ev entIn, Ev entOut)Start()Stop()GetFBTy pe()

Predef ined FB

1..*1..*

1..*1..*

1..*1..*

Profibus Device Model

Documents

Field Device Specification for the Development of Function Block Oriented Engineering Support Systems Authors: Prayati, A., Thramboulidis, K. Electrical