I have to calculate a coating weight to be updated every 5 minutes, up to 30 minutes. What is the best way to do this, an array or FIFL and FIFU in RSLogix 5000?
What are you actually looking for?
A calculation every 5 mins or 6 results of calculations over 30 mins then to do what?
You haven't mentioned FIFO or FILO (or is that LIFO). I recall the days when these instructions didn't exist, and for 6 resultant values, you may as well build your own stack to suit your specific requirements.