Some instructions only execute (or retrigger) when rung-condition-in toggles
from false to true. These are transitional-relay Ladder instructions. When used
in an Add-On Instruction, these instructions will not detect the rung-in
transition to the false state. When the EnableIn bit is false, the Add-On
Instruction Logic routine no longer executes and thus the transitional
instruction does not detect the transition to the false state. Extra conditional
logic will be required to handle triggering of transitional instructions contained