# \[Bug\] Tag Group's Min Time Between Samples not being honored

**URL:** <https://forum.inductiveautomation.com/t/bug-tag-groups-min-time-between-samples-not-being-honored/116868>\
**Category:** Ignition\
**Tags:** ignition83\
**Created:** [August 21, 2026, 10:36pm UTC](https://forum.inductiveautomation.com/t/bug-tag-groups-min-time-between-samples-not-being-honored/116868 "2026-08-21T22:36:58Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![eaolson](https://avatars.discourse-cdn.com/v4/letter/e/f07891/32.png) [@eaolson](https://forum.inductiveautomation.com/u/eaolson)\
**Post date:** [August 21, 2026, 10:36pm UTC](https://forum.inductiveautomation.com/t/bug-tag-groups-min-time-between-samples-not-being-honored/116868/1 "2026-08-21T22:36:58Z")

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When you change a tag's Sample Mode from On Change to Tag Group, I think it's still enforcing the Min Time Between Samples from when the tag was set to On Change, rather than the value for the Tag Group.

I just tested this:

1. Create a tag based on the Sine0 from the device simulator. It has a 1 s update rate. Set the tag to On Change, with a Min Time Between Samples of 60 s.
2. Edit the tag and change it to Tag Group, set to Default Historical which has a MinTBS of 1 s. When the Sample Mode is changed, the MinTBS field disappears.
3. Result, data is still being logged at 60 s intervals.
4. Edit the tag and change to On Change, change MinTBS to 20 s, do not save, change to Tag Group, then save.
5. Result: data is now logged at 20 s intervals.

Here's the logged data:

```python
"t_stamp","sine0_tagggroup"
"2026-08-21 15:06:36.217","-15.567328453063965" <-- On change, 60 s MinTBS
"2026-08-21 15:07:31.276","-49.74502182006836"
"2026-08-21 15:08:32.359","-19.125463485717773"
"2026-08-21 15:09:02.401","9.67952823638916" <-- Tag group, should be 1s
"2026-08-21 15:10:02.407","49.65243911743164"
"2026-08-21 15:11:02.414","20.87210464477539"
"2026-08-21 15:12:02.422","-36.81194305419922"
"2026-08-21 15:12:22.424","-47.41008758544922" <-- Changed to 20 s MinTBS,
"2026-08-21 15:12:32.426","-49.678077697753906" but back to Tag Group
"2026-08-21 15:12:52.440","-47.679019927978516" before saving
"2026-08-21 15:13:12.443","-37.416080474853516"
"2026-08-21 15:13:32.445","-20.644412994384766"
"2026-08-21 15:13:52.448","-0.31311002373695374"

```

When I export the tag, the MinTBS is present:

```python
{
  "dataType": "Float4",
  "historicalDeadband": 1.0,
  "historicalDeadbandStyle": "Discrete",
  "historyEnabled": true,
  "historyMaxAge": 2,
  "historyProvider": "ignitionpg",
  "historyTimeDeadband": 20,
  "name": "Sine0_TagGroup",
  "opcItemPath": "ns\u003d1;s\u003d[Sample_Device]_Meta:Sine/Sine0",
  "opcServer": "Ignition OPC UA Server",
  "sampleMode": "TagGroup",
  "tagType": "AtomicTag",
  "valueSource": "opc"
}

```

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/e/7e78ae52b92f4447ce8309cf91b4f93d1d134047.png)

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<div class="post-metadata">

**Author:** ![eaolson](https://avatars.discourse-cdn.com/v4/letter/e/f07891/32.png) [@eaolson](https://forum.inductiveautomation.com/u/eaolson)\
**Post date:** [August 24, 2026, 11:56pm UTC](https://forum.inductiveautomation.com/t/bug-tag-groups-min-time-between-samples-not-being-honored/116868/2 "2026-08-24T23:56:39Z")

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I filed a ticket on this and it was confirmed as a bug.

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<div class="post-metadata">

**Author:** ![themby](https://avatars.discourse-cdn.com/v4/letter/t/a698b9/32.png) [@themby](https://forum.inductiveautomation.com/u/themby)\
**Post date:** [August 26, 2026, 2:53pm UTC](https://forum.inductiveautomation.com/t/bug-tag-groups-min-time-between-samples-not-being-honored/116868/3 "2026-08-26T14:53:10Z")

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Is there a patch/Solution to this because i am seeing it now on a system I am working on. It filled my SQL data base in about 2 weeks because of this.

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<div class="post-metadata">

**Author:** ![eaolson](https://avatars.discourse-cdn.com/v4/letter/e/f07891/32.png) [@eaolson](https://forum.inductiveautomation.com/u/eaolson)\
**Post date:** [August 26, 2026, 3:02pm UTC](https://forum.inductiveautomation.com/t/bug-tag-groups-min-time-between-samples-not-being-honored/116868/4 "2026-08-26T15:02:40Z")

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Not that I was told, but I didn't really ask for one. I suggest submitting a support ticket.

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<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [August 26, 2026, 3:04pm UTC](https://forum.inductiveautomation.com/t/bug-tag-groups-min-time-between-samples-not-being-honored/116868/5 "2026-08-26T15:04:38Z")

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Try exporting the offending tags as JSON, removing the troublesome properties, and pasting back.

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<div class="post-metadata">

**Author:** ![themby](https://avatars.discourse-cdn.com/v4/letter/t/a698b9/32.png) [@themby](https://forum.inductiveautomation.com/u/themby)\
**Post date:** [August 26, 2026, 3:11pm UTC](https://forum.inductiveautomation.com/t/bug-tag-groups-min-time-between-samples-not-being-honored/116868/6 "2026-08-26T15:11:24Z")

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Yes I'm working on a script to add in JSON properties :

historyTimeDeadband = 15 historyTimeDeadbandUnits = "SEC",

When I export a JSON of a tag with the tag group "default historical" those tag properties are not there, but when i change the tag group to "on change" and then change it back to "default historical" they are added and the data seems to be writing correctly.