File instructions (FAL, FSC, AVE, etc.) set a .DN bit, and don't re-execute until the bit is reset, typically by a true-to-false transition...
In that case, there'd be no true-to-false transition, so the RES of the AVE control word is needed....
Clean technique.
Yes! Much cleaner than the approach I have seen (and perpetuated) involving a JMP instruction to force transitional instructions to execute on every scan of the routine/program. I have always been bothered by this rung jumping, but never knew a way to get around it. Thx.