Thanks for the clarification. In this case, I would recommend using a producer/consumer architecture. This will allow you to sample the data at your desired rate and enqueue it in the producer loop. You could then dequeue it and save it to the file in the consumer loop. If you wanted to write it once a minute, add a Wait(ms) timer in the consumer loop so that the loop only runs once per minute. There are examples of this included with LabVIEW and on our website. I hope this helps get you started!
Applications Engineer
National Instruments
