# Tag is not existed

**URL:** <https://forum.inductiveautomation.com/t/tag-is-not-existed/5279>\
**Category:** Ignition\
**Created:** [October 16, 2012, 10:42am UTC](https://forum.inductiveautomation.com/t/tag-is-not-existed/5279 "2012-10-16T10:42:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Z\_M\_S](https://avatars.discourse-cdn.com/v4/letter/z/e274bd/32.png) [@Z\_M\_S](https://forum.inductiveautomation.com/u/Z_M_S)\
**Post date:** [October 16, 2012, 10:42am UTC](https://forum.inductiveautomation.com/t/tag-is-not-existed/5279/1 "2012-10-16T10:42:40Z")

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Hi. I have one question. There are two different OPC-UA servers, working on a different PC’s. One server (let’s call it “Server 1”) has a module, wich creates some tags. This server connected to other server (let’s call it “Server 2”). In Ignition Designer, started from Server 2, in a Translation Groups window I can view that tags. But when I try to read one of that tags, using system.tag.read(“path\_to\_tag”).value, I got Null. What can I do to read that kind of tags?

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**Author:** ![Colby.Clegg](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/colby.clegg/32/3282_2.png) [@Colby.Clegg](https://forum.inductiveautomation.com/u/Colby.Clegg)\
**Post date:** [October 16, 2012, 4:28pm UTC](https://forum.inductiveautomation.com/t/tag-is-not-existed/5279/2 "2012-10-16T16:28:17Z")

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Hi,

There are probably 2 things that could help:

1. In the transaction group, you may be referencing the OPC item directly. If so, in your script, you probably want to read directly from the opc server as well, using [tt]system.opc.readValue(…)[/tt] (see [here](http://inductiveautomation.com/support/usermanuals/ignition/system_opc_readvalue.htm)).

2. If you are, in fact, reading a SQLTag that points to the opc item, you may not be using the full path to the tag, including the tag provider name. For example, it would look like: [tt]system.tag.read("[default]Path/To/Tag")[/tt]

It important to understand the difference. You can read from the opc server directly, using its item path, or you can read from a SQLTag- which might be subscribed to that opc item in turn. Which you use is up to you, but each will have their own syntax.

Regards,

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**Author:** ![Z\_M\_S](https://avatars.discourse-cdn.com/v4/letter/z/e274bd/32.png) [@Z\_M\_S](https://forum.inductiveautomation.com/u/Z_M_S)\
**Post date:** [October 17, 2012, 2:27am UTC](https://forum.inductiveautomation.com/t/tag-is-not-existed/5279/3 "2012-10-17T02:27:43Z")

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Thank you very much. The way number 1, you tell me, works.