Allen-Bradley 1771-LIZ,80DLI-8100 Interface Module

The Allen-Bradley 1771-LIZ, 80DLI-8100 Interface Module is a legacy Allen-Bradley I/O interface designed for use in the 1771 I/O system. It is installed in a 1771 I/O chassis to connect field devices to the controller via the 1771 backplane, supporting integration with classic PLC-5 and related systems. The 1771-LIZ belongs to the broader 1771 I/O ecosystem, historically supporting a range of discrete I/O modules and facilitating integration with older AB controllers. The module is identified by the part number 1771-LIZ and the variant code 80DLI-8100, reflecting its role as an interface component within the AB 1771 family. Typical applications include industrial control setups that rely on the 1771 I/O architecture, where it serves as the bridge between sensors/actuators and the PLC through the 1771 bus. As a legacy module, it is commonly sought by engineers maintaining or refurbishing PLC-5/SLC-based installations, and is available through specialized distributors and refurbishers such as York Controls and MROSupply.