Allen-Bradley 1745-E105 Programmable Logic Controller

Allen-Bradley 1745-E105 Expansion Unit for the SLC 100 programmable logic controller extends the base controller’s I/O capacity in legacy Rockwell Automation installations. As part of the 1745-E expansion family, the 1745-E105 is designed to attach to a compatible SLC 100 CPU/backplane to provide additional input/output points for small automation tasks. The module carries a maximum power requirement of 12 VA, a specification common to the E101, E102, E103, E105, and E106 expansion units, enabling engineers to budget power in compact control panels. Typical applications include retrofits or new-builds that rely on the SLC 100 for straightforward control loops, where a compact, economical expansion option is desirable. The 1745-E105 is not a standalone controller; it relies on a compatible SLC 100 base unit to operate and interface with its backplane, I/O wiring, and programming environment. In practice, it supports simple expansion scenarios where additional I/O is needed without migrating to newer PLC platforms. When pairing with a base SLC 100 system, verify compatibility of firmware and I/O modules to ensure proper communication and backplane interfacing.