OPC (OLE for Process Control) communicates information from a data source such as a server to any client third party application in a standard way without requiring the application to have specific knowledge about the data source. The OPC Alarms and Events specification is similar to the original OPC Data Access specification, only the Alarms and Events specification addresses real-time alarm and event data instead of real-time process control data.
The third party client application that is interested in an alarm subscription to the server needs to link to the server. When the client registers a link to the server, the server loads into memory and starts executing on the PC.
See the topic Using a Third Party OPC Client to access Alarm Server Data for configuration details.
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Published June 2018