I have a spreadsheet object that logs the data every hour on the hour, i.e., at 1:00 p.m., 2:00 p.m., etc. Can I make it log every hour on the half hour, i.e., at 1:30 p.m., 2:30 p.m., etc.? If so, how?
Yes you can make the spreadsheet object to behave in that way by just using with it the TimeOfHour object.
The TimeOfHour object output goes high every hour at some offset into each hour. So is just a matter of defining the offset as being half an our and placing the output of this object in the yellow field "Log now=" of the Spreadsheet object. You can leave the "Interval=" and "Logging=" field empty since the "Log now=" will override them.