Allen-Bradley 1771-IFE L02 Analog Input Module

Allen-Bradley 1771-IFE L02 is a 12-bit analog input module for PLC-5 universal I/O, supporting 16 single-ended inputs or 8 differential inputs on a single module. Designed for use in PLC-5 environments and compatible with 1771 Universal I/O chassis (such as 1771-A1B, 1771-A2B, 1771-A3B, and 1771-A4B), the 1771-IFE L02 plugs into the 1771 I/O bus to collect analog signals from sensors and transducers. Each channel is read by the PLC as part of the module's data table, enabling straightforward scaling and block-transfer writes in configuration software. The 12-bit resolution provides a balance of measurement detail and processing efficiency for common process variables. The module's architecture supports both single-ended and differential wiring schemes, giving flexibility for wiring choices based on noise environment and sensor type. Typical applications include monitoring process variables such as temperature, pressure, and flow in industrial automation setups, where up to 16 channels can be connected in a single PLC-5 rack for compact I/O expansion. The L02 revision denotes a specific hardware iteration of the 1771-IFE line, and the module remains a drop-in analog input option for PLC-5 systems using 1771 I/O backplanes.