Allen-Bradley 1771-IA Discrete Input Module

Product Overview

The Allen-Bradley 1771-IA is a PLC5 discrete input module. It has eight input channels for 120V AC or 125V DC. These channels monitor field devices like limit switches and sensors. The module provides optoelectrical isolation. This protects the system from electrical transients. It also includes input filtering to reduce noise. The front panel has eight orange status indicators. This module fits in a 1771 I/O chassis. It occupies a single slot. It requires a 1771-WA wiring arm for signal connections. The 1771-IA supports 1/2, 1, and 2 slot I/O addressing.

Binary files store data for discrete devices. After configuration, the system creates an entry in the binary file. The module converts AC signals to logic levels for the processor. It controls bits in the PLC data table. This input module interfaces with pushbuttons, limit switches, and annunciators. It provides a modular design with space-saving features. The wiring arm allows for easy replacement without rewiring.

Application Scenarios

Use this module in manufacturing and automation control. It connects to pushbuttons, limit switches, and motor starters. The module suits both AC and DC applications. It integrates with PLC5 processors. It monitors industrial processes in real time. The module works in harsh electrical environments. It reduces electrical noise with input filtering.

Technical Specifications

• The module has eight discrete input channels.
• Input voltage is 120V AC and 125V DC.
• Nominal input current is 6.83 mA at 120V AC 50 Hz.
• Nominal input current is 7.9 mA at 120V AC 60 Hz.
• Nominal input current is 7.4 mA at 125V DC.
• AC operating voltage range is 87 to 138 volts.
• DC operating voltage range is 97 to 138 volts.
• Backplane current draw is 75 milliamperes.
• Maximum power dissipation is 10.7 watts.
• Thermal dissipation is 36.5 BTU per hour.
• AC signal delay on is 24 ms plus or minus 10 ms.
• DC signal delay on is 10 ms plus or minus 4 ms.
• DC signal delay off is 20 ms plus or minus 9 ms.
• Maximum off-state current is 2.8 milliamperes.
• Dimensions are 3.5 by 6.5 by 2.0 inches.
• Wiring arm is 1771-WA.
• Chassis compatibility is 1771-AB through 1771-A4B.
• It is a series C module.
• Keying bands are between pins 10 and 12 for upper connector.
• Keying bands are between pins 4 and 6 for lower connector.

Installation & Maintenance Guide

Install this module in any available 1771 chassis slot. Ensure the power supply can handle the backplane current. Use the 1771-WA wiring arm for signal wires. Connect the wiring arm to the module. The keying bands ensure correct placement. To remove the module, disconnect the wiring arm. The wiring arm keeps the existing wiring intact. This allows for quick replacement. Do not change the keying band positions.

Packing List

• 1 x 1771-IA input module
• 1 x 1771-WA wiring arm

Shipping is via FedEx, UPS, or DHL.