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44 Siemens Simatic S7 Driver Online Help

See Also

About the SI7 I/O Driver | How the I/O Driver Works

Feature: Using OLE for Process Control (OPC)

OLE for Process Control (OPC) is a software standard that provides a method for

business applications to access plant floor data. The standard was developed

specifically for the process control industry to provide robust, high speed,

client/server communication. The standard establishes consistency between

applications, thus simplifying system integration and allowing many different types

of equipment to communicate with each other. The OLE for Process Control

Standard defines:

• A set of custom COM interfaces for OPC client and server writers.

• A set of OLE Automation Interfaces for OPC clients developed with higher-

level business applications, such as Excel and Visual Basic. 7.x drivers do not

support the OPC Automation Interface to access data.

Because OPC interfaces are designed in accordance with the OPC specification to

provide a common interface, an OPC client can connect and communicate with

multiple OPC servers from one or more different vendors, as the following figure

shows.

Application X Application Y

OPC Server C

OPC Interface

OPC Server B

OPC Interface

OPC Server A

OPC Interface

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