Allen-Bradley 1756-N2 Programmable Logic Controller Module

The Allen-Bradley 1756-N2 is a ControlLogix empty-slot filler card designed for use in standard 1756 chassis. As a passive filler, it occupies an unused backplane slot to preserve mechanical integrity and backplane alignment, with no I/O, processing, or communications functionality. It is intended for use in ControlLogix systems to maintain slot spacing and chassis stability when slots are not populated, and it supports easy future expansion by reserving space for additional modules. The 1756-N2 is compatible with standard ControlLogix backplanes and is installed in the same manner as other 1756 modules, helping keep the rack properly indexed and reducing the risk of debris entering an open slot. This accessory is part of the Rockwell Automation 1756 I/O family and is documented as the slot filler for empty slots in ControlLogix chassis.