![]() Generally, this would be a process variable like a weight scale, pH, or temperature.įIFO – The Array in which to store the signal or variable. ![]() Source – The signal or variable that you want to store in the array. ![]() We can accomplish this by using a Timer to trigger FFL and FFU instructions, and below I cover each of their parameters: Image by Brandon Cooper The first step is of the process is to record samples of your value or analog signal (level, temperature, pressure, etc) over a given amount of time. In today's article I'll walk you through setting the parameters of these instructions to do just that. These instructions are commonly used to store multiple records at a given sample rate, which then can be averaged. In a previous article regarding ControlLogix processor faults, I mentioned one of the ways a processor can be faulted was by causing an array to go out of bounds when using an FFL and FFU instruction. ![]()
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