# Constant Value DB Trend Pen Display **URL:** \ **Category:** Ignition\ **Tags:** vision, ignition81\ **Created:** [June 22, 2026, 4:54pm UTC](https://forum.inductiveautomation.com/t/constant-value-db-trend-pen-display/116097 "2026-06-22T16:54:49Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\ **Post date:** [June 22, 2026, 4:54pm UTC](https://forum.inductiveautomation.com/t/constant-value-db-trend-pen-display/116097/1 "2026-06-22T16:54:50Z")
I've got some DB pens on this trend and it's a binary value. Either 0 or 110. How do I get a line to display at all times? Let's say the value changed from 0 to 110 at 11:25 and back to 0 at 12:30. If I'm zoomed in on the trend let's say from 11:30 - 12:00 (i.e. value has not changed in that time) I get essentially nothing on the chart (it looks blank). If I export the chart to excel I can see the one row entry for 110 at 11:25 and that's it. So, why is there no horizontal line across the chart at 110? I use autorange and it puts 110 right in the middle so I can tell it's not 0. If I manually change the range to 0-150 I still see nothing. These are the pen settings: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/b/7bc85fd8a558cde8fb056a67c8331a1f71f406cf.png) I'm guessing it has something to do with interpolation. Is that not an option with DB tags? I see the option checkbox for Tag History interpolation. ---
**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:** [June 22, 2026, 5:14pm UTC](https://forum.inductiveautomation.com/t/constant-value-db-trend-pen-display/116097/2 "2026-06-22T17:14:07Z")
Interpolation is not an option for DB tags. You get a plot for whatever your DB supplies. This usually means you need to record often enough to have two points in an possible zoomed in trend window. ---
**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\ **Post date:** [June 22, 2026, 6:14pm UTC](https://forum.inductiveautomation.com/t/constant-value-db-trend-pen-display/116097/3 "2026-06-22T18:14:48Z")
Is there a way to modify the DB query to always return a value at each end of the window? ---
**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:** [June 22, 2026, 6:29pm UTC](https://forum.inductiveautomation.com/t/constant-value-db-trend-pen-display/116097/4 "2026-06-22T18:29:34Z")
No. This is a common justification to not use the ~~Power~~ EasyChart, but to use a ~~TimeSeries~~ Classic chart. (You can manipulate the data however you need.) ~~Of course, you should consider a more performant chart component (psssst! Embr!).~~ ---
**Author:** ![bmusson](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bmusson/32/87530_2.png) [@bmusson](https://forum.inductiveautomation.com/u/bmusson)\ **Post date:** [June 22, 2026, 6:43pm UTC](https://forum.inductiveautomation.com/t/constant-value-db-trend-pen-display/116097/5 "2026-06-22T18:43:52Z")
> [@pturmel](#): > > Embr The screenshot is from Vision 🙃 ---
**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\ **Post date:** [June 22, 2026, 6:45pm UTC](https://forum.inductiveautomation.com/t/constant-value-db-trend-pen-display/116097/6 "2026-06-22T18:45:27Z")
Topic is also tagged Vision ---
**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:** [June 22, 2026, 7:34pm UTC](https://forum.inductiveautomation.com/t/constant-value-db-trend-pen-display/116097/7 "2026-06-22T19:34:10Z")
Oops. Use the Classic Chart with your own named query bindings.