Cannot pre-set waveform chart x-axis scale - y-axis works OK

[wildcatherder]

I have three charts which use a common time scale.  The attached JPG shows how I use an initial structure to set YScale minimum and maximums, as well as XScale Maximums.  When I run the VI, the YScale changes take effect immediately, I can see them on the front panel.  Unfortunately, the XScale maximum does not change.

If I stop the VI and restart it, the XScale maximum is now set to the desired value.

Why does the XScale take two passes? Is there a way to update the XScale on start?

[wildcatherder · Accepted solution]

I managed to solve my own problem:

The XScale value was being set by Calculated Total Run Time. However, that value was in the second sequence frame and thus, was not available to change the XScale maximum.  I added another frame at the beginning which does nothing but take the entered time values and calculate various conversions and sums.