History function is not working

Ignition
1

Hi together,

I created an expression tag and enabled the history function.
Sometimes it writes to the database, but sometimes not and I don't know why.
(I'm using Ignition 8.1.17)

Here is a screenshot, where you can see what I mean:
The tag "rob1_2InDifferentStations" has the value 0 with the t_stamp "Fri May 26 15:22:27 CEST 2023".
But at the table on the right side, which has a binding with the tag history of this tag,you see a "-1" as last value. How is this possible?

image
image1549×609 79 KB

I already changed the "minimal time between samples" for the history function to 100ms, because I thought that maybe the changes are so to quick for the standard time of 1 second:

image
image981×1042 81.7 KB

But as you see, the difference of timestamp of the last stored -1 and the timestamp of the actual value 0 is 9 minutes !!

Has anybody an idea, what is wrong with my history function?

Kind regards,
Inken

2

Could you show a picture of binding of the table?
Your Max Time Between Samples is 0, I don't understand why the data in your picture like this.

3

I changed the Min Time Between Samples, not the Max Time.

Here is the table binding:

image
image1254×779 51.3 KB

4

I've only encountered this once.
That database was deployed on a hard disk drive with extremely poor performance, so that a lot of data was abandoned.
If this tag is the single one which lost history data, There is not a database matter.

5

It is not the only tag.
If the data would change really quick, I could understand that maybe the performance of the database is to bad.
But my two values are several minutes apart. That shouldn't be a problem. I can proof this with several other tags, I store at my database. Sometimes with only a few seconds or even milliseconds between entries.