Allen-Bradley 1756-A13 NSNBC01 Programmable Logic Controller

The Allen-Bradley 1756-A13 NSNBC01 is a 13-slot ControlLogix standard chassis that serves as the central backplane for a ControlLogix PLC system. It provides the physical backbone to mount up to 13 modules—including I/O, communications, and power modules—into a single, backplane-driven rack that communicates with a ControlLogix processor. Open-style and rack-mountable, the chassis weighs about 1.9 kg (4.2 lb) in its 1756-A13/B configuration, reflecting its purpose as a compact but capable main chassis. As a member of the 1756 ControlLogix family, the 13-slot chassis accepts a range of 1756 modules and is designed to work with standard ControlLogix CPUs to support scalable automation architectures. Catalog listings often show the model as 1756-A13 with variant codes such as NSNBC01, underscoring that NSNBC01 is a listing variant accompanying the base 1756-A13 chassis.