Trigger Externally
Offered by the Stack / Row, Grid, Palletizing and Advanced Palletizing Nodes.
If Trigger externally is turned on, the Node will not trigger itself again after an item is processed. In this case, it waits until it gets triggered by the Node that comes right before.
This is helpful if you want to e.g. use a Stack Node to grab items, and then use another Stack/Grid/Palletizing Node behind (on the Process Item output) to put those items on another Stack/Grid/Pallet.