OPC Client Driver

Introduction

OPC is a standard programming interface for accessing real time data.

The Fernhill SCADA OPC Client driver acts as an OPC client application. Using the driver you can map Fernhill SCADA tags to tags in an external OPC Server. Tag values can be read at a fixed interval, or on demand, or both.

Fernhill SCADA OPC Client Tags

The OPC Client driver provides these tag types:

Icon Tag Type Version Description
Server Icon OPC Server Connection 1.3 A connection to external OPC Data Access Server.

Fernhill SCADA IO Data Tags

You can use these IO Data Tags to represent individual data points in the OPC Server:

Icon Tag Type Version Description
Analog Data Tag IO Analog Data Tag 3.12 Maps an analog tag to an external data source.
Digital Data Tag IO Digital Data Tag 3.12 Maps a digital tag to an external data source.
String Data Tag IO String Data Tag 3.12 Maps a string tag to an external data source.
Word Data Tag IO Word Tag 3.12 Maps a 16-bit unsigned integer tag to an external data source.
Double Word Data Tag IO Double Word Tag 3.12 Maps a 32-bit unsigned integer tag to an external data source.

OPC Interfaces Used

To maximize interoperability, the OPC Client Driver uses a minimal subset of the OPC Interfaces:

Server InterfacesGroup Interfaces
IOPCServerIOPCItemMgt,
IOPCSyncRead

Further Information

Fernhill SCADA Drivers

For information about other drivers available in Fernhill SCADA.

Glossary

For the meaning of terms used in Fernhill SCADA.