# Siemens driver reading issue

**URL:** <https://forum.inductiveautomation.com/t/siemens-driver-reading-issue/24498>\
**Category:** Ignition\
**Tags:** ignition79\
**Created:** [April 30, 2019, 10:39am UTC](https://forum.inductiveautomation.com/t/siemens-driver-reading-issue/24498 "2019-04-30T10:39:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pgmo](https://avatars.discourse-cdn.com/v4/letter/p/d07c76/32.png) [@pgmo](https://forum.inductiveautomation.com/u/pgmo)\
**Post date:** [April 30, 2019, 10:39am UTC](https://forum.inductiveautomation.com/t/siemens-driver-reading-issue/24498/1 "2019-04-30T10:39:17Z")

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I’ve configured a _DataType_ **MyUDT** to read data in DB401, 402, 403 from a S7-300 (TCP-IP connection). In _MyUDT_ tags the address DB block nr is parametrized: the address of a tag in MyUDT is e.g.:  
`ns=1;s=[S7_Dev]DB{SiteNr+400},I174`  
where _SiteNr_ will be in the range 1 to 3.  
The issue I’m experiencing is that `DB401,I174` is available and the value is correct, whereas `DB402,I174` and `DB403,I174` show up with a red cross like that  
 ![immagine](https://us1.discourse-cdn.com/inductiveautomation/original/2X/5/5193ebcc0c1f29600f784db13aa16c3fac44f47c.png)  
and the _tag diagnostic_ says _Config error_.  
I’m sure that `DB402`, `DB403` have been downloaded into the PLC: I can read them with Siemens Step7. moreover I built up a connection from Kepware to the PLC and confirmed that data are there and accessible.

Thanks in advance, regards