Allen-Bradley 1747-L514 SLC 500 PLC Processor

The Allen-Bradley 1747-L514 SLC 500 PLC Processor is a compact, modular CPU in the SLC 500 family (5/01 series) used for mid‑range automation tasks in legacy Rockwell Automation installations. It supports 1K or 4K of program memory via memory modules to store ladder logic and data, enabling scalable control for small to moderate systems. For communications, the L514 includes a DH‑485 port for local networks and is designed to be programmed with RSLogix 500, typically using standard cables such as 1747-PIC, 1747-CP3, or 1747-UIC to connect to a PC or programming terminal. Electrical characteristics include a 350 mA draw at 5 V DC and a 105 mA draw from the 24 V DC backplane supply, making it suitable for use inside a single local I/O chassis with compatible SLC 500 I/O modules. In practice, the L514 is used with a range of 1747 I/O modules to implement discrete or simple analog control on conveyors, packaging lines, and other machinery that relies on the older SLC 500 ecosystem. The processor shares the SLC 5/01 architecture with related models such as 1747-L511 and 1747-L524, and is documented in Rockwell Automation manuals and product literature as part of the SLC 500 modular hardware family.