FFL and FFU: A FIFO That Tracks Parts Down a Line, and What LIFO Is For
Rockwell’s execution-time reference, LOGIX-RM002B, prints the FFL instruction on a ControlLogix 5580 as a flat 0.135 µs and the FFU beside it as 0.144 + (x × 0.07) µs. One half of the pair gets slower as the queue gets longer and the other half never does, and the reason sits in a different manual: … Read more