OPC is a standard programming interface for accessing real time data.
The Fernhill SCADA OPC Classic Client driver acts as an OPC client application. Using the driver you can map Fernhill SCADA tags to tags in an external OPC Classic 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 Classic Server Connection | 1.3 | A connection to external OPC Data Access Server. |
You can use these I/O Data Point Tags to represent individual data points in the OPC Classic Server:
| Icon | Tag Type | Version | Description |
|---|---|---|---|
 |
I/O Analog Data Point Tag | 3.12 | Maps an Analog Data Point Tag to an external data source. |
 |
I/O Digital Data Point Tag | 3.12 | Maps a Digital Data Point Tag to an external data source. |
 |
I/O String Data Point Tag | 3.12 | Maps a String Data Point Tag to an external data source. |
 |
I/O Word Data Point Tag | 3.12 | Maps a 16-bit Word Data Point Tag to an external data source. |
 |
I/O Double Word Data Point Tag | 3.12 | Maps a 32-bit Double Word Data Point Tag to an external data source. |
 |
I/O Long Word Data Point Tag | 3.48 | Maps a 64-bit Long Word Data Point 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.