Sam,
I should have checked first. It's OK for ControlLogix to divide with /. I too can not think of anything else than what you've already said: if the condition before the second CPT was true, it would give you an overflow, because AccEX_FillSpd_FPS is shown to be zero, thus giving a division by zero. But because the condition is false, it shouldn't matter. This one will be for the AB specialists here. Now, it's only 30 minutes since you've posted the problem, it shouldn't take more than about another 30 minutes, I figure.
Kind regards,