I am a new user to Ignition, using version 8.3. I have float tag that is being read from a Kepware server and logging to a Core Historian every 500ms. I have a Tag Group configured, with the tag added to the Tag Group (under both the Basic and History catagories in the tag properties). The live t…

[image] Power Chart Interpolation Ignition This topic came up a lot during training sessions. The main reason I've found that causes this is actually in the tag historical configuration, specifically the deadband style property. There are three options, auto (…

Thats what I read on other forums threads too. But within the 1-minute period shown on the graph above there should be a minimum of 60 data points (ideally 120), but the chart is just drawing a straight line between the first and last points that are in view.

Also remember that kepware is an OPC server, and there is a limited update rate on OPC of 1000ms on Ignition. As far as the data, when you pull the raw data from the historian for that tag, how many data points do you get?

[image] David_Stone: limited update rate on OPC of 1000ms on Ignition Not correct. The default is 1000ms, and that is a limit for remote tag providers. Ignition's historian will happily record at 100ms or faster if everything is configured correctly to do so.

If I tabulate the tag history data the values appear to correlate with what is graphed....but those do not correlate with the actual live data from Kepware. So this is a tag history configuration issue?

It sounds like there is some issues with your history settings.

tag history settings are posted above. For fun I I changed the data table to display AsStored and it returned....nothing.

Is the time on the kepware server and the ignition server identical?

Yes, local time on both are correct.

Perspective Power Chart not plotting all data points

Ignition

David_Stone June 18, 2026, 9:11pm 2