# Siemens S7 1200 PLC tag errors (first connection)

**URL:** <https://forum.inductiveautomation.com/t/siemens-s7-1200-plc-tag-errors-first-connection/28921>\
**Category:** Ignition\
**Tags:** ignition79\
**Created:** [October 8, 2019, 3:15pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-plc-tag-errors-first-connection/28921 "2019-10-08T15:15:41Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![lbuckley](https://avatars.discourse-cdn.com/v4/letter/l/7ba0ec/32.png) [@lbuckley](https://forum.inductiveautomation.com/u/lbuckley)\
**Post date:** [October 8, 2019, 3:15pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-plc-tag-errors-first-connection/28921/1 "2019-10-08T15:15:41Z")

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Hi,

I am preparing my first proof of concept for a project using Ignition. We have a project built in the designer and we are currently working on connecting a PLC to the project. We have established a successful PLC connection to Siemens S7 1200 on the gateway but we are having problems reading/writing to tags that we have created in the designer. Please find attached screenshots of the errors we are getting. Any help would be much appreciated.

 ![123](https://us1.discourse-cdn.com/inductiveautomation/original/2X/6/6de8b778c1c076539a7b3285a9c04baadc89fd2a.png) ![456](https://us1.discourse-cdn.com/inductiveautomation/original/2X/e/efa0e217eea11b7e995b58ab728d0403a2168679.png) ![789](https://us1.discourse-cdn.com/inductiveautomation/original/2X/6/68b6b6203411e2379c0f0cbfcf4a92d8a613c03a.png)

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**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\
**Post date:** [October 8, 2019, 3:21pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-plc-tag-errors-first-connection/28921/2 "2019-10-08T15:21:18Z")

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Check this KBA:  
[https://support.inductiveautomation.com/index.php?/Knowledgebase/Article/View/29/0/connecting-to-siemens-s7-1200-and-s7-1500](https://support.inductiveautomation.com/index.php?/Knowledgebase/Article/View/29/0/connecting-to-siemens-s7-1200-and-s7-1500)

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<div class="post-metadata">

**Author:** ![lbuckley](https://avatars.discourse-cdn.com/v4/letter/l/7ba0ec/32.png) [@lbuckley](https://forum.inductiveautomation.com/u/lbuckley)\
**Post date:** [October 8, 2019, 3:23pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-plc-tag-errors-first-connection/28921/3 "2019-10-08T15:23:56Z")

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Thanks for the response but we have already followed those instructions to no avail. Is there anything else we can do.

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**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:** [October 8, 2019, 3:26pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-plc-tag-errors-first-connection/28921/4 "2019-10-08T15:26:15Z")

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Double check you’ve made all 3 of those changes if they weren’t already configured properly and then do a recompile and download of the PLC program. I think I’ve heard of some cases from support where the recompile was necessary for it to take effect for some reason.

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<div class="post-metadata">

**Author:** ![lbuckley](https://avatars.discourse-cdn.com/v4/letter/l/7ba0ec/32.png) [@lbuckley](https://forum.inductiveautomation.com/u/lbuckley)\
**Post date:** [October 8, 2019, 3:37pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-plc-tag-errors-first-connection/28921/5 "2019-10-08T15:37:04Z")

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Kevin,

You were on the money there.

For reference, i did a full hardware download (rebuild) of the PLC on Siemens TIA, restarted the designer and it worked.

Thanks for your help

You da man