OK, next questions.
Since both Rockwell and Siemens can export .csv files,
can the order of the data be determined by the programmer?
This is for a tuning application which is done and works but it seems it is always a pain to for people to export the data.
I would like to see the data in this format
time control% PV
0.0, 50, 159,
0.1 50 160, ....
The next question is the units. For temperature system the time units are usually minutes. The control units are counts or percent. I prefer percent.
Can the units be determined by the programmer?
What I don't want to do is to write a module for each type of controller.
BTW, .dbf is an old data base format that was common long ago.