Plotting discrete data without interpolation

There is currently no reliable way to remove the interpolation from a trend. There will always be linear or stepped interpolation, depending on the tag type. The only exception to this is that points which are considered to have infinite values will not be plotted and thus would cause a gap in the interpolation.
 

For a point-based representation, you could consider switching to a scatter-plot and putting a continuously increasing time tag on the x-axis. Such a tag is sometimes available from the historian, but can also be imported or created as a custom calculation tag. Of course the scatter plot would no longer offer the direct comparison with other trends or other features you may need from the trend plots.

You could consider describing your use case in a new thread in our Product Ideas section of our community, so our product team can evaluate it.