Allen-Bradley 1771-IL Isolated Analog Input Module for PLC-5 Systems

Key Technical Specifications

• Manufacturer: Rockwell Automation / Allen-Bradley
• Model Number: 1771-IL
• Module Type: Isolated Analog Input
• Input Channels: 8 Fully Isolated Differential
• Isolation Rating: 1000 Volts Between Channels
• Resolution: 16-bit Binary Over Full Range
• Backplane Current: 1.3 Amperes @ 5V DC
• Scan Rate: 50 ms for All 8 Channels

Signal Ranges & Measurement Capabilities

• Voltage Ranges: 0-5V, 1-5V, ±5V, 0-10V, ±10V DC
• Current Ranges: 0-20mA, 4-20mA, ±20mA
• Voltage Accuracy: 0.01% Typical, 0.05% Maximum at 25°C
• Current Accuracy: 0.06% Typical, 0.1% Maximum at 25°C
• Input Impedance: 1MΩ for Voltage, 250Ω for Current
• Common Mode Rejection: >120 dB at 60 Hz

Environmental & Operational Ratings

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to 85°C (-40°F to 185°F)
• Relative Humidity: 5% to 95% Non-Condensing
• Vibration Resistance: 2.5G @ 10-500 Hz in All Axes
• Noise Immunity: NEMA ICS 3-304 Compliant
• Thermal Dissipation: 6.5 Watts Maximum

Advanced Features & Diagnostics

• The 1771-IL module provides complete channel-to-channel isolation.
• Integrated open circuit detection identifies broken wire conditions.
• Auto-calibration feature maintains long-term measurement accuracy.
• Input overvoltage protection safeguards against signal line faults.
• Data formats include natural binary and BCD scaling to ±9999.
• Block transfer programming enables flexible data handling.

Installation & Configuration

• This module installs in any standard 1771 I/O chassis with single slot width.
• You must use the 1771-WG wiring arm for proper field wiring termination.
• Recommended wire size: 14-22 AWG stranded copper with 60°C rating.
• Terminal torque specification: 0.8-1.0 Nm (7-9 lb-in)
• The module requires no external power supply for operation.
• Configuration occurs through PLC-5 block transfer instructions.

Packaging & Global Shipping

• Your order includes one genuine Allen-Bradley 1771-IL analog input module.
• We provide complete installation documentation and wiring diagrams.
• We ship internationally via FedEx, UPS, and DHL express services.
• You receive tracking information immediately after order processing.

Frequently Asked Questions (FAQ)

• What does "fully isolated differential input" mean for this module?
• Each channel has complete electrical separation from other channels and ground, preventing noise and ground loop issues.
• How does the 16-bit resolution benefit analog signal measurement?
• This high resolution provides 65,536 discrete steps across each range for extremely precise measurements.
• What industrial sensors typically connect to this analog module?
• It connects to pressure transmitters, temperature sensors, flow meters, and process instruments with standard signals.
• Can I mix different signal types on the same module?
• Yes, you can configure each channel independently for voltage or current measurement as needed.
• What is the advantage of the auto-calibration feature?
• It automatically maintains measurement accuracy over time and temperature variations without manual adjustment.

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