So I googled laplase transform and this is the first thing that pops up. Apparently, if you have Amazon Prime, you can get Laplase Transforms shipped to you free in 2 days. [ponder]
The older SLC 500 line: fixed, 5/01, and 5/02 processors do not have online editing of the programs. Pretty much in all of them you can go online and change data values and force outputs.