Question Regarding Bulk Publish Feature in OPC UA Connector

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Hello, I’m considering using the OPC UA Connector for a project in which I need to publish data on the IE Databus to make it available to a custom app. My question concerns the "Bulk Publish" feature. I’ve read through the documentation of the OPC UA Connector and understand that tag data is published in a single JSON structure to a predefined topic. However, based on the information provided, I was unable to determine whether the OPC UA Connector always publishes all selected tags or only those that have changed since the last publication to the topic. For example, let’s say I have a tag called "mode" which only changes every few hours. Is the data for the "mode" tag included in every packet, even when it hasn’t changed, or is it only published in the packet immediately following a change? It would be extremely helpful if you could clarify this for me. Thank you for your support. Best regards Tim
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1 answers
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Hello Tim, 

 

I hope you are fine. 

 

The OPC UA Connector publish data to the databus using the Common Payload Format.

Which means tag data is published as shown here: Tags Data

 

The OPC UA connector supports only one acquisition mode: CyclicOnChange.

This means it will publish only the tags whose values have changed. This means, your tag "mode" will appear in the JSON structure only when its value differs from the previous one.

 

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