1771-IFM Allen-Bradley Module 8 Differential Inputs Millivolt

Overview

The Allen-Bradley 1771-IFM is a high-precision Fast Millivolt Input Module designed for the 1771 I/O chassis. It measures low-level differential signals with excellent accuracy, making it ideal for applications that require reliable millivolt-level readings. This module delivers stable and repeatable data transfer for critical industrial automation systems.

Technical Specifications

• Model Number: 1771-IFM

• Brand / Series: Allen-Bradley 1771 I/O

• Module Type: Fast Millivolt Input Module

• Number of Inputs: 8 differential low-level inputs

• Input Voltage Range: 0–50 mV

• Resolution: 12-bit binary

• Accuracy: 0.1% of range at 25°C plus 1 LSB

• Repeatability: ±1 LSB

• Isolation Voltage: 1500V transient

• Overvoltage Protection: 32V maximum

• Input Impedance: 1 MΩ

• Maximum Input Voltage: +10V

• Common Mode Rejection: 100 dB DC to 60 Hz

• Backplane Current: 0.75 A @ +5V

• Output Type: BCD or unscaled binary (0000–4095 for BCD, 32767 for binary)

• Module Location: Fits 1771 I/O chassis, 1 slot

Key Features

• High-Precision Measurement: Ideal for low-level differential signal detection.

• Reliable Data Output: Configurable BCD or binary output ensures seamless processor integration.

• Robust Protection: Overvoltage and isolation protection safeguard both module and system.

• Compact Installation: Single-slot design saves space in standard 1771 I/O chassis.

• Industrial Durability: Built for long-term performance in harsh factory environments.

Applications

The 1771-IFM module is suitable for:

• Measuring precise sensor signals in process control

• High-accuracy millivolt data acquisition

• Temperature and strain gauge measurement systems

• SCADA and machine monitoring networks

• Industrial laboratory instrumentation

Similar Models

• 1771-IFM2 – Extended input range and higher channel count for large-scale applications.

• 1771-IFM – Standard 8-channel fast millivolt input module for precise differential measurements.

• 1771-IFC – Isolated current input module for analog signal acquisition.

FAQ

Q: How many input channels does the 1771-IFM provide?
A: It has 8 differential millivolt input channels.

Q: Can it handle voltages higher than 50 mV?
A: Inputs above 50 mV can be applied up to +10V for protection, but optimal accuracy is within 0–50 mV.

Q: What output formats are supported?
A: BCD or unscaled binary, depending on processor configuration.

Q: Is this module compatible with the 1771 I/O chassis?
A: Yes, it occupies one slot in a standard 1771 I/O chassis.