# Ignition OPC and Siemens PLC tags

**URL:** <https://forum.inductiveautomation.com/t/ignition-opc-and-siemens-plc-tags/6593>\
**Category:** Archived Topics\
**Created:** [May 28, 2013, 6:58am UTC](https://forum.inductiveautomation.com/t/ignition-opc-and-siemens-plc-tags/6593 "2013-05-28T06:58:11Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jerne](https://avatars.discourse-cdn.com/v4/letter/j/7feea3/32.png) [@Jerne](https://forum.inductiveautomation.com/u/Jerne)\
**Post date:** [May 28, 2013, 6:58am UTC](https://forum.inductiveautomation.com/t/ignition-opc-and-siemens-plc-tags/6593/1 "2013-05-28T06:58:11Z")

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Hi,

I have succesfully installed the Ignition OPC Server UA and I can read data from a Siemens PLC (CPU315).  
I have one question, how can I create tags in the OPC Server that are accessible /visible from any client? Because now I have to use the absolute address from the PLC to access the data. In the Designer I can create tags, but don’t show up in a external OPC client (like Simple OPC Client from Siemens). Does anyone know how to create such tags or what I’m doing wrong?

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**Author:** ![chi](https://avatars.discourse-cdn.com/v4/letter/c/0ea827/32.png) [@chi](https://forum.inductiveautomation.com/u/chi)\
**Post date:** [May 28, 2013, 10:21am UTC](https://forum.inductiveautomation.com/t/ignition-opc-and-siemens-plc-tags/6593/2 "2013-05-28T10:21:19Z")

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The Ignition OPC-UA Server has no support for custom tags, but you can always use the absolute address in other clients of course.

Also see [this post](http://www.inductiveautomation.com/forum/viewtopic.php?f=55&t=6913) about the same topic.

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**Author:** ![Jerne](https://avatars.discourse-cdn.com/v4/letter/j/7feea3/32.png) [@Jerne](https://forum.inductiveautomation.com/u/Jerne)\
**Post date:** [May 30, 2013, 10:06am UTC](https://forum.inductiveautomation.com/t/ignition-opc-and-siemens-plc-tags/6593/3 "2013-05-30T10:06:13Z")

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Hi,  
Thanks for your reply.  
So In other words, I can not define ‘symbolic’ tags in the server and use them in other OPC clients?

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**Author:** ![chi](https://avatars.discourse-cdn.com/v4/letter/c/0ea827/32.png) [@chi](https://forum.inductiveautomation.com/u/chi)\
**Post date:** [June 4, 2013, 6:12am UTC](https://forum.inductiveautomation.com/t/ignition-opc-and-siemens-plc-tags/6593/4 "2013-06-04T06:12:50Z")

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Yes, thats right. Symbolic tags are not supported with the Siemens Driver.