# Value Mode in History Properties

**URL:** <https://forum.inductiveautomation.com/t/value-mode-in-history-properties/1620>\
**Category:** Ignition\
**Created:** [March 10, 2010, 4:49pm UTC](https://forum.inductiveautomation.com/t/value-mode-in-history-properties/1620 "2010-03-10T16:49:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TimE](https://avatars.discourse-cdn.com/v4/letter/t/ee59a6/32.png) [@TimE](https://forum.inductiveautomation.com/u/TimE)\
**Post date:** [March 10, 2010, 4:49pm UTC](https://forum.inductiveautomation.com/t/value-mode-in-history-properties/1620/1 "2010-03-10T16:49:36Z")

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Here is a quote from the manual[quote]Analog

The value will be interpolated linearly between the last value and the next value. For example, if the value at Time0 was 1, and the value at Time2 is 3, selecting Time1 will return 2.  
[/quote]

In the case above, is Time0 the last OPC value or is it the last value stored in the historian?

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**Author:** ![Carl.Gould](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/carl.gould/32/7262_2.png) [@Carl.Gould](https://forum.inductiveautomation.com/u/Carl.Gould)\
**Post date:** [March 11, 2010, 5:12pm UTC](https://forum.inductiveautomation.com/t/value-mode-in-history-properties/1620/2 "2010-03-11T17:12:19Z")

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It is the OPC value as stored by the historian at Time 0. Don’t be confused by the fact that the historian only logs values “on change” - it also keeps track of how long a tag has stayed at a certain value.