Allen-Bradley 1771-IFMS Fast Millivolt Input Module

Product Overview

The 1771-IFMS is an analog input module from Allen-Bradley. It provides eight differential inputs. It is intrinsically safe and fast. The module accepts 0-50 mV signals. It uses 12-bit binary resolution. Accuracy is 0.1% at 25°C. Linearity and repeatability are ±1 LSB. The module has an input impedance of 1 megaohm. It features a monotonic A/D converter. The data format is ±32,767 binary or ±9999 BCD. The module does not support removal under power. It requires a 1771-WG wiring arm. The backplane current is 0.75 Amps at 5V DC. It is rack mountable.

Application Scenarios

This module is suitable for low-level millivolt signals. Use it with thermocouples and strain gauges. It works in hazardous locations. The intrinsically safe design meets T6 temperature code. Common industries include oil and gas, chemical, and refining. The module connects to PLC5 processors. It is ideal for automation systems requiring high accuracy. The module handles up to eight differential inputs. It provides fast update times of 14.5 ms. Use it in environments with high humidity (5-95% non-condensing).

Technical Specifications

Input channels: 8 differential. Voltage range: 0-50 mV. Resolution: 12-bit binary. Accuracy: 0.1% of range at 25°C. Linearity: ±1 LSB. Repeatability: ±1 LSB. A/D converter: Monotonic, no missing codes. Common-mode rejection: 100 dB at 60 Hz. Input impedance: 1 megaohm. Channel update time: 14.5 ms for eight channels. Data formats: ±32,767 binary or ±9999 BCD. Backplane current: 750 mA at 5V DC. Wiring arm: 1771-WG. Wire size: 22-14 AWG. Torque: 0.8-1.0 Nm. Operating temperature: 0 to 60°C. Humidity: 5-95% non-condensing. Shock: 15 G operating, 30 G non-operating. AC signal delay: 24 ms (±10). DC signal delay: 20 ms (±9). No external power required. Conformal coating is applied.

Installation & Maintenance Guide

Install the 1771-IFMS with the system power off. Do not remove or insert under power. Use appropriate wire size and torque. Ensure electrostatic discharge precautions. The module is open enclosure. Do not connect voltages above 250V RMS to the non-intrinsically safe side. Regular inspection ensures longevity. Keep the module in a clean environment.

Packing List

The package includes one 1771-IFMS module. The 1771-WG wiring arm is separate. Documentation is included. The module is shipped in antistatic packaging. Shipping methods: FedEx, UPS, or DHL. The weight is 1.22 kg.