CygNet OPC DA Server
OPC DA (Data Access) is a group of client-server standards that provides specifications for communicating real-time data from data acquisition devices such as PLCs to display and interface devices like SCADA systems. The CygNet OPC DA Server has been implemented based on this standard to expose CygNet SCADA real-time data to standard OPC DA client applications.
The CygNet OPC DA Server responds to requests for real-time data using the OPC DA (Data Access) specification, versions 1.0a, 2.0a, 2.05a, and 3.0.
Note: The CygNet OPC Server is an OPC DA server, although the name and user interface for the application use the label "CygNet OPC Server". For information on requesting archived data, see the CygNet OPC HDA Server. For information requesting data via the OPC UA standard, see the CygNet OPC UA Server.
The CygNet OPC Server does not support browsing. The browser is an optional interface that was not implemented.
The server is typically installed on the client side. It uses CygNet messaging to retrieve data from the current value services.
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CygNet OPC Server Data Flow |
The cycle rate of the CygNet OPC Server is twice that of the scan rate specified in the OPC client.
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