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11/15/2019
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Hi Team,
I’ve an OPC UA server (Siemens-S7) having some model defined in it. Which consist of an object of type FunctionalGroupType which contains another object of type BaseObjectType having some variables & properties as children.
Hierarchy:
Object-A (FunctionalGroupType)
|
Object-B (BaseObjectType)
|
Variable-1 (Int)
Variable-2 (String), etc.
When I am trying to browse Object-A, some clients like Softing/Prosys are able to browse it. But, in some client it returns Empty References. I tried creating similar model in another OPC-UA server & it was working for me (For this, I had used OPC-UA SDK to create console OPC-UA server & don’t have Siemens-S7 configured at my end. Imported DI 1.2 nodeset.xml as well).
I tried reading specifications including DI specs & Googled as well but, didn’t get any thing.
Could you please give some pointers around what could be the possible reason for this ?
FYI: In the earlier case, there are some custom ReferenceTypes, VariableTypes & ObjectTypes defined in model. But, in later not.
05/30/2017
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What are you calling an “empty reference”?
Sounds like a server bug.
11/15/2019
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Thank you Randy for quick response.
Below are the steps when I am trying to browse above mentioned hierarchy of nodes:
- BrowseRequest made with parameters (NodeId, BroswseDirection.Both, NodeClass.All, BrowseResultMask.All, IncludeSubtypes=True)
- Got result of browsing node
- StatusCode is Good for Browse call
- Checking if there are any references available in browse results via results.getReferences() method call
- Got empty list of references here; reference list size is zero
- ContinuationPoint is also null.
- No children visible in client for browsed Node.
Please let me know if you need any other information.
05/30/2017
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Try adding a ReferenceTypeId. If it works it is bug in the server.
11/15/2019
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Thank you Randy. Let me try to browse it with ReferenceTypeId.
11/15/2019
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One more question I’ve, is there any impact of difference in Siemens CPU ? e.g., one server have CPU 1517-3 & other server have CPU 1511C devices connected ?
Try adding a ReferenceTypeId. If it works it is bug in the server.
Do you mean OPC server may have some issue ?
05/30/2017
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I don’t know about the Siemens products.
A null referencetypeid is valid according to the spec. if the server returns nothing with a null referencetypeid but something with a non-null referencetypeid then the server is not following the spec.
11/15/2019
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Ok, Got it. Thank you Randy
I’ll check on this & will share comments on analyzing this issue. I may need some time to check on this part. I’ll keep posting about the results I get during analysis.
11/15/2019
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This issue is resolved now.
There are some updates pending at server end & the OPC server was acting a proxy server. After installing updates on proxy server, communication between PLC & OPC server started working.
Thank you Randy for all your support.
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