Product Overview

The Allen-Bradley 1771-IA2 is a digital input module for PLC 5 systems. It handles 120V AC/DC signals. This module converts input signals to logic levels. It works with pushbuttons, limit switches, and proximity switches. The module has eight inputs. It uses a 1771-WA wiring arm for easy replacement. This design saves space and costs. The module supports 1/2, 1, and 2-slot addressing.

Application Scenarios

Use the 1771-IA2 with AC/DC proximity switches. It interfaces with on/off sensors and actuators. Common applications include industrial automation lines. It monitors motor starters and pilot lights. The module also works with annunciators and limit switches. It directly controls data table bits in the PLC.

Technical Specifications

The 1771-IA2 has a voltage rating of 120V AC/DC. Operating range is 87-138V AC or 97-138V DC. Backplane current is 75 milliamperes. Maximum off-state current is 2.8 milliamperes. Typical AC signal delay is 24 ms (±10 ms) on and off. Typical DC signal delay is 10 ms (±4 ms) on, 20 ms (±9 ms) off. Dimensions are 3.5 x 6.5 x 2.0 inches. Power dissipation is 10.7 W. Thermal dissipation is 36.5 BTU/hr. The module has eight orange status indicators. It provides optoelectrical isolation and input filtering.

Installation & Maintenance Guide

Install the 1771-IA2 in a 1771 I/O chassis. Use keying bands between pins 10-12 and 4-6. The wiring arm 1771-WA allows module changes without disconnecting wires. Ensure the chassis has a PLC processor. Check voltage ranges before operation. Replace the module only when power is off. Regular inspection of status lights helps detect faults.

Packing List

The package includes one 1771-IA2 input module. It also includes a 1771-WA wiring arm. No additional accessories are required. The product ships securely in anti-static packaging. Shipping uses Fedex, UPS, or DHL.