# Tag Historical "On Change" Mode Not Working

**URL:** <https://forum.inductiveautomation.com/t/tag-historical-on-change-mode-not-working/64151>\
**Category:** Ignition\
**Tags:** ignition81, database, perspective\
**Created:** [September 16, 2022, 8:24am UTC](https://forum.inductiveautomation.com/t/tag-historical-on-change-mode-not-working/64151 "2022-09-16T08:24:54Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![jlandwerlen](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@jlandwerlen](https://forum.inductiveautomation.com/u/jlandwerlen)\
**Post date:** [September 16, 2022, 2:24pm UTC](https://forum.inductiveautomation.com/t/tag-historical-on-change-mode-not-working/64151/3 "2022-09-16T14:24:11Z")

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Your other post answered the issue on min vs max time between samples, it looks like you are getting the definitions reversed.

> [@Tags Historical logging Sampling rate Issue](https://forum.inductiveautomation.com/t/tags-historical-logging-sampling-rate-issue/64075):
>
> Dear All, Hope you all are doing well. I am facing a very weird issue when using the tag history feature in Ignition 8.1 perspective. When, I enable historical logging in a tag (float datatype) and do the configuration i.e. make the the sampling mode “On Change”, Minimum Sampling Time 1 sec and Maximum Sampling time 3 Hr (picture below). After doing this, when the tag starts running and getting different values in it, no values are logged in the database and on Power Chart the trend of that t…

To add, perhaps the docs will help, [Configuring Tag History - Ignition User Manual 8.1 - Ignition Documentation](https://docs.inductiveautomation.com/display/DOC81/Configuring+Tag+History)

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