Graphing measurement versus position for a continuous roll based process

[DarkLordOfG]

I am working on a DAQ application for a continuous roll-based process.  What I want to do is plot measurement versus position.  What is unique is that the graph x axis has to reset for each new roll that is created for the process.  i.e. I want to plot measurement versus position in a roll.  The attached file shows what I am trying to do.  Has anyone tried this?  Is it even possible to have positive numbers on both sides of a zero point in a graph?

Thanks,

John

[Craig_D]

John,

Unfortunately, there wouldn't be a way to have an arbitrarily numbered x-axis as you are describing.  In cartesian coordinates, you cannot have repeated points like this.

If you know how many points are acquired per roll, one way to do this is to clear a charts history after this number of points and for every clear increment a roll counter.  See the attached VI for an idea of what I'm talking about.

Regards,

Craig D

Applications Engineer

National Instruments