Allen-Bradley 1764-28BXB Programmable Logic Controller

The Allen-Bradley 1764-28BXB MicroLogix 1500 base unit is a compact, purpose-built 24V DC controller base that provides the integrated processor, power supply, and I/O module required to build reliable MicroLogix 1500 control systems in space-constrained panels. It houses 16 inputs and 12 outputs on a single base, with 24 V DC input circuits configured as sink/source and an output array that includes six relay outputs and six DC FET outputs for mixed digital switching and DC control in one enclosure. The base unit operates from a 20.4–30.0 V DC line supply, draws roughly 30 W, and supports up to 400 mA of continuous load current, while its physical footprint measures 5.43 by 6.62 by 3.43 inches, making installation straightforward in standard control cabinets. Compatible with Rockwell Automation processors such as the 1764-LSP or 1764-LRP, the 1764-28BXB also supports expanded I/O up to a maximum of 512 when paired with appropriate modules, making it a practical choice for small- to mid-size automation tasks that require robust 24V DC control in a compact form factor.