A-B 1771-IFE Analog Input Module

Allen-Bradley 1771-IFE Analog Input Module

 

 

 

The Allen-Bradley 1771-IFE is an analog input module used in the PLC-5 (1771 I/O) system. It is designed to convert field analog signals (voltage or current) into digital values for the PLC CPU (like 1785-L40B / L80B).

It is a classic process signal interface module widely used for temperature, pressure, level, flow, and other instrumentation signals.

Key Specifications

• Model: 1771-IFE
• Brand: Allen-Bradley (Rockwell Automation)
• Series: PLC-5 / 1771 I/O system
• Type: Analog Input Module
• Inputs:
  • 16 single-ended inputs OR
  • 8 differential inputs
• Signal Types:
  • Voltage: 0–5V, ±10V, etc.
  • Current: 4–20 mA, 0–20 mA, ±20 mA
• Resolution: 12-bit (plus sign for bipolar ranges)
• Backplane power: ~0.75A @ 5V
• Mounting: 1771 chassis (1 slot)
• Wiring: 1771-WG removable wiring arm
• Data transfer: Block transfer (BTW / BTR instructions)

What it does (simple explanation)

Sensor (4–20mA / Voltage)
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1771-IFE Analog Input Module
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Converts signal → digital value
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PLC-5 CPU (1785-L40B / L80B)
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Used in logic / HMI / control

Main Functions

• Reads analog process signals
• Converts analog → digital values
• Sends data to PLC via block transfer
• Supports scaling for engineering units (pressure, temperature, etc.)
• Provides isolated measurement channels
• Enables process automation control

Key Features

• 16 single-ended or 8 differential inputs
• Supports multiple voltage/current ranges
• 12-bit resolution for process control accuracy
• Built-in signal filtering and isolation
• Compatible with PLC-5 block transfer instructions (BTW/BTR)
• Removable wiring arm for easy maintenance
• Industrial noise protection design

Applications

• Temperature measurement (RTD + transmitter)
• Pressure transmitters (4–20 mA)
• Level sensors
• Flow meters
• Vibration / process instrumentation
• Large industrial process control systems