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Allen-Bradley 1746-N2 is a slot filler for the SLC 500 chassis, covering unused I/O slots to protect the backplane from debris and short circuits. Covers up to 3 slots.
Allen-Bradley 1756-N2 ControlLogix empty-slot filler card.
Allen-Bradley 1756-N2B ControlLogix empty-slot cover.
Allen-Bradley 1756-N2XT ControlLogix XT extended-temperature empty-slot filler module.