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IDProjectCategoryView StatusDate SubmittedLast Update
000616910000-014: PubSubSpecpublic2020-10-21 14:162020-12-08 20:59
ReporterLiam Power Assigned ToMatthias Damm  
PrioritynormalSeverityminorReproducibilityN/A
Status closedResolutionfixed 
Summary0006169: Explanatory text for SubscribedDataSetType options
Description

There doesn't seem to be (at least I didn't see it) any explanation of what the expected use cases are for SubscribedDataSetMirror versus TargetVariables.

My take on it is that you would use a mirror as a subscriber if you want to subscribe (or read) values from a given publisher and you would use target values when you want to publish (or write to) given pre-existing values in a subscriber or subscribers. Obviously there are other use cases too.

People may disagree with the terminology and/or description above and that's fine. If it's not already there though it would be useful to describe the conceptual use cases in the spec. so people understand what they are typically used for.

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Matthias Damm

2020-12-08 11:24

developer   ~0013398

Added following introduction text to 5.4.2.2 Message reception
The two concrete SubscribedDataSet options with standard OPC UA configuration are TargetVariables and SubscribedDataSetMirror. The configuration of TargetVariables allows the dispatching of DataSetMessage fields to existing Variables in the Subscribers OPC UA AddressSpace. The configuration of SubscribedDataSetMirror is used if the received DataSet fields should be represented as Variables in the Subscribers OPC UA AddressSpace but the Variables do no exist and must be created as part of the Subscriber configuration.

Added the following extension to the introduction text in 5.4.1.2 Message sending
The two concrete PublishedDataSet options with standard OPC UA configuration are PublishedDataItems for Variable base collection and PublishedEvents for Event based collection.

Added references to 5.4.1.2 and 5.4.2.2 to the relevant chapters in 6.2.2/6.2.9 and 9.1.4/9.1.9

Contained in OPC 10000-14 - UA Specification Part 14 - PubSub 1.05.0 Draft29.docx

Jim Luth

2020-12-08 20:59

administrator   ~0013411

Agreed to changes in Virtual F2F.

Issue History

Date Modified Username Field Change
2020-10-21 14:16 Liam Power New Issue
2020-12-08 11:24 Matthias Damm Assigned To => Matthias Damm
2020-12-08 11:24 Matthias Damm Status new => resolved
2020-12-08 11:24 Matthias Damm Resolution open => fixed
2020-12-08 11:24 Matthias Damm Note Added: 0013398
2020-12-08 20:59 Jim Luth Status resolved => closed
2020-12-08 20:59 Jim Luth Fixed in Version => 1.05
2020-12-08 20:59 Jim Luth Note Added: 0013411