Allen-Bradley 1745-LP103 Programmable Controller

The Allen-Bradley 1745-LP103 is the processor module for the SLC‑100 Programmable Controller family, delivering the controller’s central processing alongside power and I/O in a single plug‑in unit. The module contains the processor (CPU) and battery‑backed CMOS RAM memory, a built‑in power supply, and 16 I/O circuits, all designed to run ladder logic programs with the familiar relay logic, timers, counters, sequencers, and shift registers of the SLC‑100 system. Program and data loading are supported by an EEPROM Memory Module that plugs into the processor, with a Pocket Programmer available to load, monitor, edit, and troubleshoot the stored program. The SLC‑100 family, including the LP103, was offered in four processor versions to meet various application requirements, making this LP103 variant a specific option within the lineup. This particular model is documented as discontinued by the manufacturer, a status common for legacy SLC‑100 components, which are still encountered in existing automation retrofits and maintenance projects. Typical applications for the SLC‑100/LP103 pairing include control of machine tools, assembly lines, material handling systems, and molding or casting equipment, where a compact, ladder‑based PLC solution provides reliable discrete control and straightforward programming in industrial environments.