AB 1771-IAN PLC-5 32-Input Digital Module 120V AC/DC Specs

Product Overview

• The Allen-Bradley 1771-IAN provides high-density digital interfacing for industrial control systems.
• It converts 120V AC/DC field signals into logic levels for PLC-5 processors.
• The module features 32 separate input points organized into four isolated groups.
• Integrated optoelectrical isolation protects internal logic from high-voltage electrical transients.
• Its modular design optimizes cabinet space within the 1771 I/O platform.

Technical Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Model: 1771-IAN
• Series: PLC-5 Digital I/O System
• Input Count: 32 Digital Inputs (4 Sets of 8)
• Voltage Category: 120 Volts AC/DC
• AC Operating Range: 85–138 Volts AC
• Frequency Response: 47–63 Hz
• Backplane Current: 280 Miliamperes
• Max Off-State Current: 3.0mA (AC) / 0.8mA (DC)
• Signal Delay (On): 10ms (+/- 7ms)
• Signal Delay (Off): 20ms (+/- 15ms)
• Power Dissipation: 7 Watts (Maximum)
• Thermal Dissipation: 24.1 BTU/hr
• Environmental Tolerance: Industrial grade shielding for high-noise areas
• Anti-Interference: Onboard hardware filtering reduces electrical noise

Installation and Compatibility

• Chassis Support: Compatible with all 1771 I/O chassis types.
• Addressing: Supports 1/2-slot and 1-slot I/O addressing configurations.
• Required Hardware: Uses the 1771-WN wiring arm for field terminations.
• Slot Keying: Positioned between pins 20-22 (upper) and 16-18 (lower).
• Device Compatibility: Works with PLC-5/11, PLC-5/20, and PLC-5/40 controllers.

Global PLC Spare HUB Review

• The 1771-IAN is a remarkably reliable module for high-voltage sensing requirements.
• Engineers prefer this 32-point version to maximize I/O density in crowded panels.
• The 1771-WN wiring arm allows for fast module swaps during maintenance.
• Status LEDs provide instant visual confirmation for field-side troubleshooting operations.

Typical Application Scenarios

• Monitoring heavy-duty pushbuttons and emergency stop circuits.
• Interfacing with 120V limit switches on conveyor systems.
• Receiving status feedback from motor starters and contactors.
• Integration with selector switches in power distribution panels.

Shipping and Warranty

• Warranty: 12-month comprehensive functional warranty.
• Dispatch: Orders ship within 24–48 hours of confirmation.
• Carrier Options: Worldwide express delivery via FedEx, UPS, and DHL.
• Packing List: One (1) 1771-IAN module in anti-static packaging.

FAQ & Selection Guide

• Question: Can this module sense DC voltage signals?
• Answer: Yes, it supports 120V DC sensing alongside standard AC signals.
• Question: How do I identify a specific failed input point?
• Answer: Check the 32 red status indicators located on the front panel.
• Question: Is the wiring arm included in this package?
• Answer: Please verify your specific order as the wiring arm is typically sold separately.
• Experience Tip: Always verify that field wiring uses proper surge suppression for inductive loads.
• Selection Guide: Choose the 1771-IAN when upgrading from lower-density 16-point modules to save space.

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