You're called to a robotic palletizing cell that hard e-stops every time a finished pallet exits through the light curtain at the discharge. It won't reset until they remove the pallet, the operator is manually pulling pallets out of the discharge every pallet. He says he's never seen it do this before. What should I check? Answer: The light curtain is doing its job correctly. A light curtain doesn't know the difference between a pallet and a person, and it's not supposed to