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Programmable Logic Controller (PLC) Advance Programming

Department of Engineering Physics-ITB Mei 2004

15-1

PLC Link OPCLC Link OPC

Department of Engineering Physics

Institut Teknologi Bandung

2004

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15-2

TopicsTopics

OLE for Process Control (OPC)

Connecting PLC to HMI using OPC

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15-3

Objective:

Use Wonderwares OPCLink I/O Server and OPC

Browser to link to an OPC Server.

Introduction

OPCLink Server OPC Browser

OLE for Process Control (OPC)OLE for Process Control (OPC)

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15-4


OPC is a published industrial standard for system

interconnectivity.

It uses Microsofts COM and DCOM technology to enableapplications to exchange data on one or more

computers using a client/server architecture.

OPC defines a common set of interfaces. So applicationsretrieve data in exactly the same format regardless of

whether the data source is a PLC, DCS, gauge,

analyzer, software application or anything else

As a result, OPC is as an out-of-the-box, plug and

play communication solution.

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15-5


Provide a standards-based infrastructure for the exchange

of process control data different connection type

(serial,radio,ethernet,etc) and various operatingsystem

POWER

ALLEN BRADLEY

!

RUN

FLT

BATT

FORCE

Dh485

Rs232

SLC 5/05 CPU

R UN P RO GREM

INPUT

DC-SINK

0

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INPUT

DC-SINK

0

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OUTPUT

RELAY

0

1

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13

14

15

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15-6

OPC SolutionOPC Solution

POWER

ALLENBRADLEY

!

RUN

FLT

BATT

FORCE

Dh485

Rs232

SLC5/05 CPU

RUN PROGREM

INPUT

DC-SINK

0

1

2

3

4

5

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INPUT

DC-SINK

0

1

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OUTPUT

RELAY

0

1

2

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15

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15-7


OPC standardizes on a technology rather than aproduct

OPC set of standards, data can be passed from any data

source to any OPC compliant application includeHuman Machine Interfaces (or HMIs), trenders,

spreadsheets, data archivers, Enterprise Resource

Planning applications, and others. OPC enables to visualize, analyze, report, or do anything

with applications from almost any vendor using one or

more of the OPC specifications.

OPC technology enable true interoperability, reduce

implementation costs, and build a fully scalable system

for the future.

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15-8

OPC ServerOPC Server

Tag browsing

Efficient standard mechanism for data exchange

Support for Ranging (low-high)

Multi Threading design

Support of COM and DCOM

Plug and Play

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15-9

Accessing OPC ServerAccessing OPC Server

OPCENUM Service enables clients to access OPC

Server of executive node in LAN

Registry information will be required to access OPCServer on the other node from client machine.

This interface information of COM (property, method) is

registered in registry of local disk because OPC Serveris COM application.

OPCENUM.EXE is a program that is executed on the

node OPC Server is installed in and provides registryinformation of OPC Server corresponding the request

of the other node.

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15-10

Accessing OPC ServerAccessing OPC Server

Node A

OPC ServerRegistry

OPCEnum.exe

Node B

OPC Client

Ethernet

Get Server Info

By NODE

Server Information

Call OPC BROWSE object

with the node name from

OPC Client (Node B).

OPCENUM.EXE gets

server list from local

registry and passes itto Node B.

OPC Client accesses

OPC Server object with

the server info andnode name

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15-11

ProprietaryProprietary vsvsOPC ConnectivityOPC Connectivity

Common Plant Requirements

Plant needed to monitor equipment

Various different applications were needed to analyze data

Various different devices generated data

Plant process wanted to monitor their turbines using ta

Human Machine Interface, or HMI, for visualization, a

Process Historian for data storage, and a machinecondition monitoring application.

The data would come from three different data

sources; a PLC, a vibration monitoring system, and acalculation engine.

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15-12

Requirem entRequirem ent

Minimize device loads by minimizing data requests

Quickly and easily implement a communicationinfrastructure

Minimize implementation and acquisition costs

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15-13

Proprietary SolutionProprietary Solution

POWER

Allen-BradleyQUALITY

RUN

BAT

I/O

Rs232

OK

R UN P R OGREM

Logix5550

RXD

ETHERNET< >

T X D O K

ControlNET

OK

A 03*

AT

AT

Required many custom

drivers

Multiple device drivers

would create too many

data requests

Lengthy

implementation

time and excessivecosts incurred

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15-14

OPC SolutionOPC Solution

POWER

Allen-BradleyQUALITY

RUN

BAT

I/O

Rs232

OK

RUN PROGREM

Logix5550

RXD

ETHERNET< >

TXD OK

ControlNET

OK

A 03*

AT

AT

OPC solution

minimizes devices

drivers

OPC drivers are

readily available

OPC reduces device

loads significantly

Implementation time

and all costs drastically

reduced

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15-15

Toolbox OPC Power ServerToolbox O PC Power Server

Provide plant floor

data from multiple

brands Support

FastDDE,SuiteLink,

AdvancedDDE and

DDE softwareinterface

Support

Wonderware

InTouch,RSView32,

Intellution32,iFix,etc

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15-16

FeaturesFeatures

Supported on Windows 95/98/Me and NT/2000/XP

Support forOPC Data Access 2.05 standard

software interface reduces integration costs byconnecting to a wide range of applications

Support forFastDDE & SuiteLink for seamless

connectivity to Wonderware InTouch Support forIntellution NIO interface for direct

connection to the iFix Process Database

Support forAdvanceDDE, NetDDE and DDE roundsout the connectivity choices TOP Server offers

Automatic Tag Database Generation

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15-17

Features ContinuedFeatures Continued

Dynamic Tag Creation

Tag Import/Export - bring in data from CSV files to

speed configuration or sharing with other applications

InTouch Tag Import Wizard reduces engineering time

for Wonderware Users

Free OPC Quick Client provides a known entity OPCclient for quick field deployment & testing

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15-18

Start Top Server PLC5Start Top Server PLC5

On the Start menu, select Programs, select SoftwareToolbox, select Top Server

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15-19

Configuring ChannelConfiguring Channel

Channel represents a communication medium from the

PC to one or more external devices.

Channel can be used to represent either a serial port

or a card installed in the PC.

D f E i i Ph i ITB M i 2004

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15-20

Configuring DeviceConfiguring Device

Device represent PLCs or other hardware that the server

will communicate with. The device driver that the channel

is using restricts device selection.

D t t f E i i Ph i ITB M i 2004

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15-21

A tag represents addresses with in the PLC or other

hardware device that the server communicates with.

The server allows both dynamic tags, (tags created in

the client that access addresses directly) and user

defined static tags.

User defined static tags are created in the server andbenefit the user by allowing the tag to be browsed from

OPC clients that support tag browsing.

Creating TagCreating Tag

D t t f E i i Ph i ITB M i 2004

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15-22

Creating TagCreating Tag

Department of Engineering Physics ITB Mei 2004

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OPC Quick Client provides a known entity OPC client

for quick field deployment and testing

OPC Quick ClientOPC Quick Client


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Creating Access Nam eCreating Access Nam e


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Creating HM ICreating HM ITagnam eTagnam e


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Create Dynam ic HM I ObjectCreate Dynamic HM I Object

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