subscriptions parameters
@OPCUA/for-node-red provides a convenient way to manage subscriptions to an OPC UA server.
Subscriptions parameters are defined in the OPC UA Endpoint editor, which can be accessed by clicking on the edit button next to the Connection field in the OPC UA Client node.
By default the OPC UA Endpoint editor provides a set of default subscriptions that can be used to read data from the server.
Most of the time you will not need to change the subscriptions parameters, but you can customize them if needed.
Subscriptions parameters are defined in the Subscriptions tab of the OPC UA Endpoint editor.
Three default subscriptions are automatically created for you, for a given connection point.
| Name | Publishing Interval |
|---|---|
| Default | 1 second |
| Fast | 500ms |
| Slow | 5 seconds |
The three subscriptions provide different publishing intervals for the most common scenario we usually find in typical IIoT applications.
You can customize the parameter or delete or add new subscriptions if you wish.
Most of the time, only a few subscriptions are needed.
it serves as a mechanism to keep the connection always active with the server by handling a keepalive packet, and serves as well in the automatic reconnection mechanism, in case of a network outage.