Allen-Bradley 1771-IFEK Analog Input Module, PLC-5

June 10, 2026 • 2 min read • wayne • Science

Why the 1771-IFEK Fits Your Procurement Needs

Procurement managers need a module that withstands harsh plant environments. The 1771-IFEK uses a conformal coating to resist moisture and corrosion. This coating extends the module’s lifespan in humid or dirty settings. The module accepts five voltage ranges and three current ranges. You can select 0‑5 V dc, 1‑5 V dc, ±5 V dc, ±10 V dc, or 0‑10 V dc. Current options include 4‑20 mA, 0‑20 mA, and ±20 mA. This flexibility allows the module to interface with many sensors and transmitters. The 1771-IFEK does not require an external power supply. It draws 750 mA from the backplane at 5 V dc. This low current consumption reduces overall system power demands. The module supports up to 16 single-ended or 8 differential inputs. Differential mode improves noise rejection for long cable runs. Data formats include natural binary or BCD scaling to ±9999. The resolution is 12 bits plus sign, giving you accurate readings.

Step-by-Step Installation Guide for the 1771-IFEK

Installing the 1771-IFEK is straightforward with the correct accessories. First, mount the module into a single slot of a 1771 I/O chassis. Use keying bands between pins 10‑12 and 24‑26. These bands ensure only the correct module occupies that slot. Next, connect the field wiring arm 1771‑WG. The wiring arm allows you to replace the module without disconnecting wires. This feature saves valuable maintenance time. For wiring, use the appropriate voltage or current inputs. The module has a channel update time of 18 ms for eight channels and 36 ms for sixteen channels. After power‑up, check the front‑panel LEDs. A green RUN light indicates normal operation. A red FAULT light signals a problem. The module provides optoelectrical isolation and digital filtering. These features reduce electrical noise from motors and solenoids. No external power supply is needed because the backplane powers the module.