# Not able to write Siemens PLC tags from ignition

**URL:** <https://forum.inductiveautomation.com/t/not-able-to-write-siemens-plc-tags-from-ignition/79587>\
**Category:** Ignition\
**Tags:** vision\
**Created:** [September 25, 2023, 2:23pm UTC](https://forum.inductiveautomation.com/t/not-able-to-write-siemens-plc-tags-from-ignition/79587 "2023-09-25T14:23:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Stef\_Velers](https://avatars.discourse-cdn.com/v4/letter/s/bc8723/32.png) [@Stef\_Velers](https://forum.inductiveautomation.com/u/Stef_Velers)\
**Post date:** [September 25, 2023, 2:23pm UTC](https://forum.inductiveautomation.com/t/not-able-to-write-siemens-plc-tags-from-ignition/79587/1 "2023-09-25T14:23:25Z")

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Hello,

I have a problem whenever I want to give a value to a tag that is in the PLC I get the error: Error writing to overrideOff.value: Bad("Bad\_NotWritable: The access level does not allow writing to the Node."). This is weird because I have read/write permission set to public and the read-only option to false. Also in tia portal I have writing/reading enabled so I don't know the issue here.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/d/9d5a80f726212b20a1d76d9ecf9e771cfc299a8c.png)  
these are my current settings for one of the tags.

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<div class="post-metadata">

**Author:** ![Stef\_Velers](https://avatars.discourse-cdn.com/v4/letter/s/bc8723/32.png) [@Stef\_Velers](https://forum.inductiveautomation.com/u/Stef_Velers)\
**Post date:** [September 25, 2023, 2:26pm UTC](https://forum.inductiveautomation.com/t/not-able-to-write-siemens-plc-tags-from-ignition/79587/2 "2023-09-25T14:26:19Z")

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Also, I'm able to change the tag values in Tia portal and see the change on my ignition designer so they are connected the right way through the OPC UA server I think.

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [September 25, 2023, 2:29pm UTC](https://forum.inductiveautomation.com/t/not-able-to-write-siemens-plc-tags-from-ignition/79587/3 "2023-09-25T14:29:49Z")

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They are probably configured to be read-only in the PLC/server.