# Siemens s7-1500 tags turn green after adding data

**URL:** <https://forum.inductiveautomation.com/t/siemens-s7-1500-tags-turn-green-after-adding-data/12133>\
**Category:** Ignition\
**Created:** [September 16, 2016, 8:50pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-tags-turn-green-after-adding-data/12133 "2016-09-16T20:50:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tkelch](https://avatars.discourse-cdn.com/v4/letter/t/ccd318/32.png) [@tkelch](https://forum.inductiveautomation.com/u/tkelch)\
**Post date:** [September 16, 2016, 8:50pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-tags-turn-green-after-adding-data/12133/1 "2016-09-16T20:50:17Z")

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I was running into problems where I would add some tags (6 of them) and I would add a seventh tag and all of my tags would get a little green symbol.

I would then delete the six tags I previously added and re-add the seventh tag, and it would be fine.

Frustrating.

It turned out to be an issue with the Siemens driver (v3.8.3) in which IA is currently working to resolve.

I fixed my problem by monitoring less data (I had a few large 256 byte strings that I stopped looking at).

String Path: `ns=1;s=[PLC_Siemens]DB5500,string52.5`  
.5 limits the length to 5 bytes.

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**Author:** ![zxcslo](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/zxcslo/32/61610_2.png) [@zxcslo](https://forum.inductiveautomation.com/u/zxcslo)\
**Post date:** [September 18, 2016, 5:49pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-tags-turn-green-after-adding-data/12133/2 "2016-09-18T17:49:01Z")

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I encountered the same problem with Siemens S7-414 CPU earlier this year…  
[https://inductiveautomation.com/forum/viewtopic.php?f=94&t=15278](https://inductiveautomation.com/forum/viewtopic.php?f=94&t=15278)

It turns out that IA Siemens driver can’t read STRINGs from Siemens PLC longer than 202 bytes.