Why the OPC UA path in Factory Talk can't contain more than 3 elements?

Yashka · May 25, 2020

Hi to All!

I'm using Factory Talk Studio Enterprise V10, FT Services V3.0, KepServerEX 6.8. I'm always getting no data if the OPC UA path in Factory Talk contains more than 3 elements. Any other OPC UA Clients are working fine.

Could anyone help me to sort out with the strange behavior of Factory Talk OPC Connector?

thingstodo · May 25, 2020

Yashka said:
Hi to All!

I'm using Factory Talk Studio Enterprise V10, FT Services V3.0, KepServerEX 6.8. I'm always getting no data if the OPC UA path in Factory Talk contains more than 3 elements. Any other OPC UA Clients are working fine.

Could anyone help me to sort out with the strange behavior of Factory Talk OPC Connector?

I have no UA experience, so take this with a grain of salt

... is your 'test' a set of local tags? I have had problems with OPC not wanting to read local tags. I'm told there is a work-around for that, but I just ended up making the tags Global and it worked.

Yashka · May 25, 2020

thingstodo said:
I have no UA experience, so take this with a grain of salt

... is your 'test' a set of local tags? I have had problems with OPC not wanting to read local tags. I'm told there is a work-around for that, but I just ended up making the tags Global and it worked.

No, the "test" is just the group. For example, when you are using AB ControlLogix it may be the name of a program that contains tags. The idea to make all tags on the 3td level is not original, currently, we've done it already as soon as faced up with this issue. But every node in OPC UA contains set of special groups that contain server related tags like _System.Error, etc. And all of these tags are located on the 4th level and we can't move ones anywhere.

KirkC · May 25, 2020

Will Kepware's alias map help? This can provide a short alias to the first 2 layers of your paths.

Yashka · May 25, 2020

KirkC said:
Will Kepware's alias map help? This can provide a short alias to the first 2 layers of your paths.

Nice idea! Thanks! I've read appropriate sections in the Kepware manual but I don't understand how it uses from client-side. I made alias (see attachment) but I can't see one even in Quick Client

KirkC · May 25, 2020

In the Kepware configurator click Edit->Alias Map then Add new alias. Did you do that first?

Yashka · May 25, 2020

KirkC said:
In the Kepware configurator click Edit->Alias Map then Add new alias. Did you do that first?

Yes, I've attached the screenshot in the previous post with created alias. But I can't see one in the client.

AlfredoQuintero · May 27, 2020

Yashka, what is the error for the OPCUA node (the tags you are trying to read) that the OPC Client reports? OPCUA specification has very specific error responses. Using any free OPCUA client such as Softing's or Unified Automation's will provide you a screen where you can get the error. If you let me know this error I might be able to help you crack this problem. Good luck.

Yashka · May 27, 2020

AlfredoQuintero said:
Yashka, what is the error for the OPCUA node (the tags you are trying to read) that the OPC Client reports? OPCUA specification has very specific error responses. Using any free OPCUA client such as Softing's or Unified Automation's will provide you a screen where you can get the error. If you let me know this error I might be able to help you crack this problem. Good luck.

Thanks for your help, but I've already resolved this issue together with AB guys. https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1089037

AlfredoQuintero · May 27, 2020

Great, and thanks for sharing the solution. Did not know about this issue.

Why the OPC UA path in Factory Talk can't contain more than 3 elements?

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