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March 27, 2014
9:48, EET
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bernd.parchmann
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hi,

i started to program an opc-client. i can connect to the opc-da/ua-server (TwinCAT 3 PLC with 4 Global Variable Lists with some variables).

now i want to get a list of the visible plc variables. I have a list of the names (ex: PLC1/GVL_Write/bWrite).

how can i do this? i want to read and write values with the client.

thx for help!

March 27, 2014
10:20, EET
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Jouni Aro
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You need to find the NodeId for each variable. You can do this by browsing the address space. The Java Client is handy for this, for example.

It is possible that the server uses the addresses you have as NodeId identifiers, but it’s best to validate the NodeIds with the visual browser, since it also contains the NamespaceIndex, which you need for the NodeId as well.

March 27, 2014
11:12, EET
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bernd.parchmann
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my problem is to browse the address space… i found the prosys tutorial (no. 7. browse the address space). but there i need a node id to browse?! but i dont have any ids!

when i use “Identifiers.Root” as node id, i get a list of three nodes (view, object and server). but because i dont have the complete information for other nodes i cant browse the other nodes (for example one of my global variable list)

March 28, 2014
7:51, EET
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bernd.parchmann
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i solved the problem above!

thx!

October 9, 2015
21:51, EEST
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AlexGoss
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bernd.parchmann said

i solved the problem above!

thx!

Hi Bernd,

I am currently at the same point as you have been. Could you please describe how to browse through the Object tree?

Thank you very much!

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