有什么方法可以减少 OPC UA 客户端中的标签浏览时间？...连接 OPC UA 服务器时

Question

I have reduce and checked with SamplingInterval and PublishingInterval ..values There is no impact. can you suggest any way? Let me know.

Answer 1

As noted before, SamplingInterval and PublishingInterval will not affect the Browse service. That's why you don't see any improvement.

Browsing in OPC UA is quite expensive on both ends, but you can probably manage some optimization.

I do not know what technology (or SDK or language) you are using but here's a list of things you could investigate:

1. Filter you Browse request : for example, if you are only interested in objects and variables but not so much on types etc. you could apply a nodeClassMask to your Browse request (your SDK or stack should allow that). This will tremendously reduce the information going across for the response.
2. Choose your browsing direction : in the Browse request, you can specify the browseDirection flag to tell the server to follow certain types of references (forward, reverse, or both). In most cases forward is what you'd want if you are browsing for variables and objects. This will also speed up the request/response. You will see that parameter in the same specification and also in your SDK documentation.
3. Pick a reference type to follow : similarly to #2, you can select one specific reference type to use for your Browse (ie Organizes, HasComponent, HasTypeDefinition, etc.) to reduce payloads. This Browse request parameter is called referenceTypeId .

Details on things you can do with a Browse requests are in this section of the OPC Specification .

To give you an idea, here's a snippet using the OPC UA .NET-Standard C# API to make a browse request with some of those parameters filtered:

session.Browse(
                null,
                null,
                ObjectIds.ObjectsFolder,
                0u,
                BrowseDirection.Forward, //forward only
                ReferenceTypeIds.HierarchicalReferences, //only hierarchical
                true,
                (uint)NodeClass.Variable | (uint)NodeClass.Object | (uint)NodeClass.Method,
                out continuationPoint,
                out references);

Hopefully this will help you bit. OPC UA can be cumbersome at times...