Allen-Bradley 1771-IFE Analog Input Module PLC-5

Allen-Bradley 1771-IFE PLC-5 Analog Input Module is a 12‑bit analog input card for PLC‑5 backplanes that converts a wide range of sensor signals into a proportional 12‑bit binary value readable by the processor. It supports up to 16 single‑ended inputs or 8 differential inputs, enabling flexible wiring for voltage signals in industrial environments. Input ranges include 0–5 V, 1–5 V, ±5 V, and ±10 V, with the data presented as natural binary or four‑digit BCD depending on configuration. The module is powered from the backplane (no external supply required) and occupies a 1771 I/O chassis, typically drawing around 750 mA of backplane current. A variant, the 1771-IFE/C, provides galvanic isolation for applications requiring electrical separation between field signals and the controller. Typical channel update times vary with channel count, commonly around 5 ms for eight channels and about 10 ms for sixteen channels in standard PLC‑5 configurations. In addition to standard 1771‑IFE, the 1771 family includes related input modules offering different sensor types, but 1771‑IFE remains the high‑density voltage input option for PLC‑5 systems.