RSTrendX
Near the bottom of the Project Tree in RSLogix is a folder called Trends.
Click on it and select New. Give it a name
Now the folder will show a +. Click on that, open your recently named trend. Right click on the trend field and select Chart Properties.
Use the Help file, and just experiment.
If your data in F8 is a shift register, you will need only one pen to watch the points. If you have 30 independent data points, you might want to create a couple of trends, or use the "Visable" feature for select pens.
Have fun.