TM

OLE for Process Control and Factory Automation

OPC Servers Integrator OPC Servers Integrator - A OPC Programming Middleware - A OPC Programming Middleware

TopicsTopics

• Data Access Problem• OLE for Process Control (OPC)• OPC Programming• OPC Servers Integrator (OPCSI)

Before OPCBefore OPC

SoftwareDriver

SoftwareDriver

SoftwareDriver

SoftwareDriver

DisplayApplication

TrendApplication

ReportApplication

How does OPC Solve the Problem?How does OPC Solve the Problem?

SoftwareDriver

SoftwareDriver

SoftwareDriver

SoftwareDriver

OPC OPC OPC OPC

DisplayApplication

TrendApplication

ReportApplication

OPC OPC OPC

Where does OPC Fit?Where does OPC Fit?

Low level sensorsTypically use a dedicated

Hardware Interface and protocolDevice Specific I/O Control

Data MonitorSubSystem

OPC

OPC (via DCOM)can also be used between subsystemsand Management Consoles

OPC is generally usedbetween Monitoring

applications and I/O specificsoftware drivers

OPC Programming IssuesOPC Programming Issues

• COM Programming Details • Dozens of Interfaces• Hundreds of Methods• Resources Sharing• Vendor-Specific Names

OPC Servers Integrator (OPCSI)OPC Servers Integrator (OPCSI)

ProxyObj objectsShared Memory

ChnlObj objects

CacheObj object

Application X

OPCSI Interface

Application Y

OPCSI Interface

OPC Server A

OPC Server B

FeaturesFeatures

• A middleware for OPC servers• Detects and maintains all OPC servers• Supports direct and cache accesses• Two interfaces and a handful of methods• Manages shared resources• User-defined names• Hides COM/OPC programming details

BenefitsBenefits

• Rapid development• Low maintenance• Superior performance• Flexibility• Leverage of enterprise development

OPCSI InterfacesOPCSI Interfaces

• IProxyObj• IMappedVarViewer

OPC ServerOPC Server

OPC/COM Interfaces

OPC Group & Item Management

Item Data Optimization and Monitoring

Device Specific Protocol Logic

Hardware Connection Management

The Server InterfacesThe Server Interfaces

• The server is a COM object which provides:

• IOPCServer• IOPCBrowseServerAddressSpace (optional)• IOPCCommon (2.0)• IOPCItemProperties(2.0)• IConnectionPointContainer(2.0)

OPCServer

The Group InterfacesThe Group Interfaces

• The Group is a COM object which provides:

• IOPCGroupStateMgt• IOPCAsyncIO2 (2.0 - replaces IOPCAsyncIO)• IOPCItemMgt• IOPCSyncIO • IConnectionPointContainer (2.0 replaces

IDataObject)

OPCGroup

The Client Side IntefacesThe Client Side Intefaces

• The Client provides 2 COM interfaces that the server can call

• IOPCShutdown• IOPCDataCallback Server Object

Group Object(s)Client

IOPCDataChange

IOPCShutdown