This data is typically stored in files, databases, or remote telemetry systems. OPC-HDA (Historical Data Access) – This is used to retrieve historical process data for analysis.OPC AE ( Alarms and Events) – OPC AE servers are used to accept and exchange process alarms and events.The Following are some of the OPC specifications that are used in Industries, In addition to improving OPC server and client connections, the OPC datahub can connect any OPC server or client to other applications as well, including Excel, a web browser, or any other database. The OPC datahub is designed in such a way to handle all those connections. The combination of OPC server and OPC client supports many connections. OPC tunneling – In this method, the OPC client is connected to an OPC server over a network.OPC bridging – In this method, the OPC server is connected with another OPC server to share data.OPC aggregation – In this method, the OPC Client is connected to several OPC servers to acquire data.But there are some famous alternate methods, Usually, the OPC is implemented in a Single Server – Client in a single system format.
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