# TAG reading issue

**URL:** <https://forum.inductiveautomation.com/t/tag-reading-issue/31460>\
**Category:** Ignition\
**Created:** [January 21, 2020, 12:33pm UTC](https://forum.inductiveautomation.com/t/tag-reading-issue/31460 "2020-01-21T12:33:54Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [January 21, 2020, 1:52pm UTC](https://forum.inductiveautomation.com/t/tag-reading-issue/31460/2 "2020-01-21T13:52:15Z")

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There are a number of [Siemens-specific items that should be checked](https://support.inductiveautomation.com/index.php?/Knowledgebase/Article/View/29/0/connecting-to-siemens-s7-1200-and-s7-1500), but if @chi or @zxcslo have suggestions, follow their advice.

Aside from that, momentary buttons are always a problem if they aren't connected via a true I/O protocol. The following discussions are focused on Allen-Bradley products, but the issue is the same and the mitigations are similar.

Start here:

> [@HMI Momentary button Gets stuck with N/O Bit of PLC](http://forum.inductiveautomation.com/t/hmi-momentary-button-gets-stuck-with-n-o-bit-of-plc/21388/4):
>
> This thread, going back some years, is the most detailed discussion of the problem: Another thread on this issue – somewhat heated at points:

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