# OPC Tag Config Error: DB not accessible

**URL:** <https://forum.inductiveautomation.com/t/opc-tag-config-error-db-not-accessible/58032>\
**Category:** Ignition\
**Tags:** ignition79, vision\
**Created:** [April 5, 2022, 7:34am UTC](https://forum.inductiveautomation.com/t/opc-tag-config-error-db-not-accessible/58032 "2022-04-05T07:34:47Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Roman\_Windischbauer](https://avatars.discourse-cdn.com/v4/letter/r/35a633/32.png) [@Roman\_Windischbauer](https://forum.inductiveautomation.com/u/Roman_Windischbauer)\
**Post date:** [April 5, 2022, 7:34am UTC](https://forum.inductiveautomation.com/t/opc-tag-config-error-db-not-accessible/58032/1 "2022-04-05T07:34:47Z")

</div>

Hello,  
i use the S71500 driver to get tags from a PLC.  
I use a UDT to create several instances wich then refer to different DBs in the PLC.  
**For some reason, DB 11106 is not readable.**

Only data from DB11105 is readable, 11106 throws a “config error” even though they are configurated identically.

Here you can see that both tags use the same UDT:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/3/b320e6bfb465e0f5655a8b30f7fd92c4bec921d1.png)

This is the item path, instead of 11105 there is 11106 in the other tag.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/f/e/fef647971e146600af3f32869abd18d6258321b2.png)

But only one of the tags is able to read data from the PLC:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/d/0d85f19e86785c73b58263ab02a19a9844956e5c.png)

Both datablocks are available in the plc, they are configured identically:  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/8/a89ffb915cfdf643853dc6c3d95709945d098e1f.png)

Can anyone please tell me what im doing wrong here?