# No optimized AddressBlock list found for items

**URL:** <https://forum.inductiveautomation.com/t/no-optimized-addressblock-list-found-for-items/29490>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [October 29, 2019, 4:32pm UTC](https://forum.inductiveautomation.com/t/no-optimized-addressblock-list-found-for-items/29490 "2019-10-29T16:32:42Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![c.bertulli](https://avatars.discourse-cdn.com/v4/letter/c/f19dbf/32.png) [@c.bertulli](https://forum.inductiveautomation.com/u/c.bertulli)\
**Post date:** [October 29, 2019, 4:32pm UTC](https://forum.inductiveautomation.com/t/no-optimized-addressblock-list-found-for-items/29490/1 "2019-10-29T16:32:43Z")

</div>

Hi All,

Inside the LOG section ( Status - DIAGNOSTICS - Logs ) there are a lot of errors regarding " No optimized AddressBlock list found for items ".

PLC is an S7-1500 ( Siemens )

The whole error is :  
`No optimized AddressBlock list found for items: [com.inductiveautomation.xopc.driver.api.AggregateReadItem@7e01ab63, com.inductiveautomation.xopc.driver.api.AggregateReadItem@3da4c491, com.inductiveautomation.xopc.driver.api.AggregateReadItem@6325e66d, com.inductiveautomation.xopc.driver.api.AggregateReadItem@5504bbe4, com.inductiveautomation.xopc.driver.api.AggregateReadItem@26ad5894, com.inductiveautomation.xopc.driver.api.AggregateReadItem@3db6809c, com.inductiveautomation.xopc.driver.api.AggregateReadItem@716c1fc9, com.inductiveautomation.xopc.driver.api.AggregateReadItem@1c7419b, com.inductiveautomation.xopc.driver.api.AggregateReadItem@4d62c0cf, com.inductiveautomation.xopc.driver.api.AggregateReadItem@44591b9f, com.inductiveautomation.xopc.driver.api.AggregateReadItem@555ac68a, com.inductiveautomation.xopc.driver.api.AggregateReadItem@6e2a9e23, com.inductiveautomation.xopc.driver.api.AggregateReadItem@35155f91, com.inductiveautomation.xopc.driver.api.AggregateReadItem@399c2f4f, com.inductiveautomation.xopc.driver.api.AggregateReadItem@3a71c060, com.inductiveautomation.xopc.driver.api.AggregateReadItem@109a8b, com.inductiveautomation.xopc.driver.api.AggregateReadItem@1fe6b4cf, com.inductiveautomation.xopc.driver.api.AggregateReadItem@4758162b, com.inductiveautomation.xopc.driver.api.AggregateReadItem@739ebc60, com.inductiveautomation.xopc.driver.api.AggregateReadItem@775eb45a, com.inductiveautomation.xopc.driver.api.AggregateReadItem@5db436b2, com.inductiveautomation.xopc.driver.api.AggregateReadItem@5a5a8a61, com.inductiveautomation.xopc.driver.api.AggregateReadItem@5ca150f6, com.inductiveautomation.xopc.driver.api.AggregateReadItem@5edfc35c, com.inductiveautomation.xopc.driver.api.AggregateReadItem@22a27f93, com.inductiveautomation.xopc.driver.api.AggregateReadItem@2ca5e024, com.inductiveautomation.xopc.driver.api.AggregateReadItem@7ad533a6, com.inductiveautomation.xopc.driver.api.AggregateReadItem@5a30ca83, com.inductiveautomation.xopc.driver.api.AggregateReadItem@6bdf68b1, com.inductiveautomation.xopc.driver.api.AggregateReadItem@68f8012e, com.inductiveautomation.xopc.driver.api.AggregateReadItem@3be35794, com.inductiveautomation.xopc.driver.api.AggregateReadItem@67dbf6b9]`  
Do I have to worry?

Cheers,