Allen-Bradley 1746-N2 SLC 500 Card Slot Filler is a modular backplane blank designed to cover unused slots in an SLC 500 chassis, preserving backplane alignment. Cataloged as 1746-N2 (often listed as 1746-N2A), it is intended for use in SLC 500 modular systems and expansion chassis such as the 1746-A2. This non-electrical filler inserts into a single slot to secure the slot opening and prevent dust intrusion when no I/O module occupies the slot.
