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Browse variables of a server
June 19, 2014
13:03, EEST
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Roberto
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Hello,
I need to write a program that retrieves the list of the variables from an OPC server.
Is it possible to browse the variables in the server? Can you give me an hint?

Thanks,
Roberto

June 19, 2014
13:17, EEST
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Jouni Aro
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With normal browse, you can only search the variables hierarchically.

to get all variables, you could only use the Query method, but I am afraid there are not many servers that would support it.

So in practice, you need to browse the address space hierarchically and try to locate the variables. Just be aware that there may be loops in theory, i.e. you may get back to a node that you have already browsed.

June 19, 2014
16:59, EEST
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Roberto
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Thank you for your quick answer!

July 3, 2014
10:36, EEST
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Jouni Aro
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I just realised that this question was about OPC DA and not OPC UA. In OPC DA, you can indeed read the list of tags from the server. You just need to define in the client that you want to browse the address space in list mode. Simply like this:

PsOPCServer1.Connect;
PsOPCServer1.AddressSpace.Mode := amFlat;
ListBox1.Items.Assign(PsOPCServer1.AddressSpace);

The answer I gave above is valid for OPC UA only, but that’s not available with Prosys Sentrol. Sorry about the confusion.

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