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String id for OpcUa Folders [message #1834488]

Wed, 11 November 2020 11:52

Mario Krizic

Messages: 38
Registered: April 2019

Member

Hello,

I want my application to use have String identifiers in the OpcUa nodeset. I have created all my variables and methods using "s=" which nicely adds the id to my node. However, the directories do not have String nodes, but use numeric instead which hinders me accessing a folder by it's Id in my concurrent Application.

Is there a way to convert the directory ids to String using their path for example? I have looked into the CMake cache and did not find any option and the documentation does not cover creating directories so I guess this is not an option aswell.

Thank you in advance
Mario

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Re: String id for OpcUa Folders [message #1834490 is a reply to message #1834488]

Wed, 11 November 2020 12:00

Jose Maria Jesus Cabral Lassalle

Messages: 199
Registered: February 2016

Senior Member

It's the same for folders:

/Objects/folder,s=myStringIdFolder/var1,s=myStringIdVar

this will set the string id "myStringIdFolder" for the folder and "myStringIdVar " for the variable.

Jose

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Re: String id for OpcUa Folders [message #1834491 is a reply to message #1834490]

Wed, 11 November 2020 12:14

Mario Krizic

Messages: 38
Registered: April 2019

Member

Thank you very much! This solves my problem

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Re: String id for OpcUa Folders [message #1834492 is a reply to message #1834491]

Wed, 11 November 2020 12:26

Mario Krizic

Messages: 38
Registered: April 2019

Member

Ok I was looking at a wrong node in UaExpert since the nodes have shifted around. Assuming I am creating a variable using this:

opc_ua[WRITE;/Objects/Device/Module/Id,1:s=/Device/Module/Id]

I need to transform it into this:

opc_ua[WRITE;/Objects/Device/Module,s=Module/Id,1:s=/Device/Module/Id]

For my case it did not work and is not displaying the variable at all

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Re: String id for OpcUa Folders [message #1834500 is a reply to message #1834488]

Wed, 11 November 2020 14:13

Kirill Dorofeev

Messages: 58
Registered: February 2016

Member

a workaround for this would be first to create a folder using CREATE_OBJECT with the required node id and then to create a variable in the folder.. requires a bit of work but that is how it works now..

create a folder (0:i=61) is the NodeId of the FolderType

opc_ua[CREATE_OBJECT;,0:i=61;/Objects/Device/Module,1:s=Module]

and then instantiate the variables you need in the folder

opc_ua[WRITE;/Objects/Device/Module/Id,1:s=/Device/Module/Id]

Hope this helps,
Kirill

Attachment: 4diac_opcua_folder.PNG
(Size: 10.77KB, Downloaded 23 times)

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Re: String id for OpcUa Folders [message #1834502 is a reply to message #1834500]

Wed, 11 November 2020 14:24

Jose Maria Jesus Cabral Lassalle

Messages: 199
Registered: February 2016

Senior Member

That's right, thanks Kirill.

That's the only way for now. I didn't realize it was not possible to set two nodeIds

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Re: String id for OpcUa Folders [message #1834506 is a reply to message #1834502]

Wed, 11 November 2020 15:05

Mario Krizic

Messages: 38
Registered: April 2019

Member

@Kirill DorofeevFriend

I have tried your approach by creating a folder first. Can you check if the folder keeps the string nodeId after you create the Id variable?
If I only create the Folder it shows up as expected, but after I add a variable node the folder is using an integer instead

This confuses me since I am creating the folder first. Any ideas?

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Re: String id for OpcUa Folders [message #1834511 is a reply to message #1834506]

Wed, 11 November 2020 15:43

Kirill Dorofeev

Messages: 58
Registered: February 2016

Member

I've attached the screenshot with the app in my previous message. With it, both folder and variable in it get the string nodeids as expected. Does your application look similar? Cheers, Kirill

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Re: String id for OpcUa Folders [message #1834513 is a reply to message #1834511]

Wed, 11 November 2020 15:55

Mario Krizic

Messages: 38
Registered: April 2019

Member

Yes i have attached a screenshot of the used application I used including a screenshot from UaExpert showing that the nodeId is still a numeric value

Attachment: UaExpertCapabilityId.PNG
(Size: 6.06KB, Downloaded 17 times)
Attachment: opcuaStringFolderId.PNG
(Size: 14.29KB, Downloaded 15 times)

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Re: String id for OpcUa Folders [message #1834514 is a reply to message #1834513]

Wed, 11 November 2020 16:15

Kirill Dorofeev

Messages: 58
Registered: February 2016

Member

Could you please also copy what you have there on PARAMS port for both publish FBs?

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Re: String id for OpcUa Folders [message #1834515 is a reply to message #1834514]

Wed, 11 November 2020 16:17

Mario Krizic

Messages: 38
Registered: April 2019

Member

Publish_0: opc_ua[CREATE_OBJECT;,0:i=61;/Objects/Plotter/HANDSHAKE_FU/CAPABILITIES/CAPABILITY1]

HSCapabilityId opc_ua[WRITE;/Objects/Plotter/HANDSHAKE_FU/CAPABILITIES/CAPABILITY1/ID,1:s=Plotter/HANDSHAKE_FU/CAPABILITIES/CAPABILITY1/ID]

Hope this helps

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Re: String id for OpcUa Folders [message #1834518 is a reply to message #1834515]

Wed, 11 November 2020 16:30

Kirill Dorofeev

Messages: 58
Registered: February 2016

Member

in PUBLISH_0 you need to specify the string node id you wanna have there as following:

opc_ua[CREATE_OBJECT;,0:i=61;/Objects/Plotter/HANDSHAKE_FU/CAPABILITIES/CAPABILITY1,1:s=Plotter/HANDSHAKE_FU/CAPABILITIES/CAPABILITY1]

[Updated on: Wed, 11 November 2020 16:31]

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