# Error writing "Tag".value: Bad

**URL:** <https://forum.inductiveautomation.com/t/error-writing-tag-value-bad/85284>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [February 6, 2024, 10:54am UTC](https://forum.inductiveautomation.com/t/error-writing-tag-value-bad/85284 "2024-02-06T10:54:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Molnar\_Bence](https://avatars.discourse-cdn.com/v4/letter/m/c68b51/32.png) [@Molnar\_Bence](https://forum.inductiveautomation.com/u/Molnar_Bence)\
**Post date:** [February 6, 2024, 10:54am UTC](https://forum.inductiveautomation.com/t/error-writing-tag-value-bad/85284/1 "2024-02-06T10:54:59Z")

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Hi everyone!

I connected my PLC (s7-1200) in the gateway ( it works good):

 ![gatewy](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/4/3484c0a745fbdace5f864d640213a25ddcab6be5.png)

But I don't write this tag in the designer and here is the error screen:

 ![launcher](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/c/ec63d200d1b01aa6a2cdd257e2c7a1c9bce28105.png)

The tag is just a simple tag:

 ![input](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/f/bf3f238251891a9572d10aff8fa788f2bd884ced.png)

Do you have idea what is the problem? Why show the error screen and the error code? And why I can't write this tag?  
Error: Error writing to Start.value: Bad

Thank yo for helping!

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<div class="post-metadata">

**Author:** ![Molnar\_Bence](https://avatars.discourse-cdn.com/v4/letter/m/c68b51/32.png) [@Molnar\_Bence](https://forum.inductiveautomation.com/u/Molnar_Bence)\
**Post date:** [February 7, 2024, 10:17am UTC](https://forum.inductiveautomation.com/t/error-writing-tag-value-bad/85284/2 "2024-02-07T10:17:32Z")

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I find the solution and I show this.  
If you use TIA portal you have to put on this box. For me that was the solution.

 ![problemgood](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/4/a4d8edeca472f1d13c92ba5692af0e7d09154675.png)

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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:** [February 7, 2024, 1:24pm UTC](https://forum.inductiveautomation.com/t/error-writing-tag-value-bad/85284/3 "2024-02-07T13:24:49Z")

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It always helps to read the documentation for the driver you are trying to use:

[https://docs.inductiveautomation.com/display/DOC81/Siemens#Siemens-Considerationsfor1200and1500Devices](https://docs.inductiveautomation.com/display/DOC81/Siemens#Siemens-Considerationsfor1200and1500Devices)