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.
The OPC Client driver provides these tag types:
| Icon | Tag Type | Version | Description |
|---|---|---|---|
|
OPC Server Connection | 1.3 | A connection to external OPC Data Access Server. |
You can use these IO Data Tags to represent individual data points in the OPC Server:
| Icon | Tag Type | Version | Description |
|---|---|---|---|
 |
IO Analog Data Tag | 3.12 | Maps an analog tag to an external data source. |
 |
IO Digital Data Tag | 3.12 | Maps a digital tag to an external data source. |
 |
IO String Data Tag | 3.12 | Maps a string tag to an external data source. |
 |
IO Word Tag | 3.12 | Maps a 16-bit unsigned integer tag to an external data source. |
 |
IO Double Word Tag | 3.12 | Maps a 32-bit unsigned integer tag to an external data source. |
To maximize interoperability, the OPC Client Driver uses a minimal subset of the OPC Interfaces:
| Server Interfaces | Group Interfaces |
|---|---|
| IOPCServer | IOPCItemMgt, IOPCSyncRead |
For information about other drivers available in Fernhill SCADA.
For the meaning of terms used in Fernhill SCADA.