How to plot gather buffers

As a new user I am having trouble visualizing how I can plot the contents of a Gather buffer. I don't see them as an option in the plot function under the PMAC IDE.

Specifically this is one I would like to plot:

Gather.Addr[2] = Motor[2].ActPos.a;

This is an input from a device that puts out a varying DC voltage, I need to plot that voltage over a period of execution in a PLC.

Thanks for any help.