# Tag group properties questions

**URL:** <https://forum.inductiveautomation.com/t/tag-group-properties-questions/80379>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [October 12, 2023, 8:14am UTC](https://forum.inductiveautomation.com/t/tag-group-properties-questions/80379 "2023-10-12T08:14:08Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [October 12, 2023, 8:17am UTC](https://forum.inductiveautomation.com/t/tag-group-properties-questions/80379/2 "2023-10-12T08:17:54Z")

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"Read after write" only has any effect with OPC tags, and it causes an explicit read to be issued to the underlying OPC server after the write has finished.

It's something of a legacy option and should not be used with OPC UA tags unless the Tag Group is in Polled/Read mode.

> [@Esn](#):
>
> If I have a bunch of memory tags and OPC tags and I just want them to "update" their values when they are wirtten to from an Ignition designer or client, because I know that is the only time they change, how would I best set up the tag group for them?

This is already how tags behave, you don't need to set anything special.

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