Product Overview

The Allen-Bradley 1769-IF4 is a high-precision analog expansion module engineered for the CompactLogix™ and MicroLogix™ 1500 controller platforms. This module provides four high-density input channels capable of converting analog signals from field sensors into digital data for the PLC processor. It is a fundamental component for industrial processes requiring the monitoring of physical variables such as pressure, temperature, flow, and level.

Designed for versatility, the 1769-IF4 supports both current and voltage signals. Its architecture allows for flexible field interfacing, where each of the four channels can be independently programmed as either a differential input (for superior noise rejection) or a single-ended input (to maximize terminal density). The module utilizes a 14-bit resolution to ensure fine-grained accuracy for sensitive control loops and PID algorithms.

Signal Processing and Diagnostic Capabilities

The 1769-IF4 is equipped with advanced firmware features that enhance system reliability and simplify software development within the Logix Designer environment.

• Multi-Range Compatibility: Supports standard industrial signal ranges including 0…20 mA, 4…20 mA, 0…10V DC, 1…5V DC, 0…5V DC, and ±10V DC.

• Built-in Intelligence: Features integrated process alarms and open-circuit detection to alert the controller of hardware failures or out-of-range sensor data.

• Data Formatting: Users can configure data to be reported in Engineering Units, Percent of Range, Raw/Proportional counts, or Scaled-for-PID formats, reducing the need for complex scaling blocks in the PLC ladder logic.

• Noise Suppression: Engineered with a digital filter and a high common-mode rejection ratio (>60 dB), the module ensures stable readings even in electrically noisy factory environments.

Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model Number: 1769-IF4

• Inputs: 4 Analog Channels (Current or Voltage)

• Resolution: 14 bits (unipolar); 14 bits plus sign (bipolar)

• Input Impedance: 150 Ω (Current); 1 MΩ (Voltage)

• Backplane Current: 105 mA @ 5.1V DC; 40 mA @ 24V DC

• Common Mode Rejection: >60 dB @ 50/60 Hz

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Dimensions: 11.8 x 3.5 x 8.7 cm (4.65 x 1.38 x 3.43 in.)

• Vibration/Shock: 5g operational vibration; 30g operational shock

• Shipping Weight: 0.9 kg (Approximate with packaging)

Installation and Environmental Resistance

• Mounting Flexibility: The module can be secured via DIN rail or direct panel mounting using the integrated mounting feet.

• Wiring Standards: Includes a removable terminal block supporting wire sizes from 22…14 AWG (solid) and 22…16 AWG (stranded).

• Chassis Integration: Features a robust bus lever for secure connection to adjacent 1769 modules, ensuring backplane communication integrity under mechanical stress.

• Diagnostic Feedback: A front-panel "OK" LED provides real-time health status, indicating whether the module has passed internal self-tests and is communicating correctly with the bus.