Allen-Bradley

Allen-Bradley 1771-IA PLC-5 Discrete Input Module

SKU 1771-IA

In stock
  • 12-month warranty
  • Free returns within 30 days

  • Manufacturer: Allen-Bradley

  • Product No.: 1771-IA

  • Country of origin:United States

  • Product Type: Discrete Input Module

  • Payment: T/T, Western Union

  • Weight: 1000g

  • Shipping port: Xiamen

  • Warranty: 12 months

Overview

The Allen-Bradley 1771-IA is an eight-point digital input module for the 1771 I/O platform. It accepts 120 VAC or 125 VDC field input signals.

Input Specifications

  • Catalog number: 1771-IA
  • Channels: 8
  • Input signal: 87–138 VAC or 97–138 VDC
  • Backplane current: 75 mA

Lifecycle

Rockwell Automation lists the 1771-IA as discontinued from July 31, 2017.

For installed 1771 systems, verify the exact catalog number, field voltage, wiring arm, and chassis configuration before replacement.

Migration Reference

Rockwell offers the 1492-CM1771-LD007 swing-arm conversion module for migration from 1771-IA or 1771-IA2 wiring to a 1756-IA16 installation.

FAQ

What control systems and chassis are compatible with the Allen-Bradley 1771-IA?
The Allen-Bradley 1771-IA discrete input module is specifically designed for operation within the legacy PLC-5 and 1771 I/O platform architectures. It mounts directly into standard Allen-Bradley 1771 I/O chassis and draws 75 mA of operational current directly from the system backplane power supply. Additionally, the unit incorporates mechanical keying bands on the backplane connector to prevent incorrect insertion into unauthorized slots.

What are the nominal voltage ratings and operating limits for the Allen-Bradley 1771-IA?
The Allen-Bradley 1771-IA supports nominal input voltages of 120 VAC (47 to 63 Hz) and 125 VDC for various industrial sensing applications. Its on-state voltage range spans from 87 to 138 VAC or 97 to 138 VDC, while the maximum off-state voltage is rated at 46 VAC peak or 57 VDC. These electrical specifications allow the module to interface reliably with standard field devices like limit switches, pushbuttons, and AC proximity sensors.

How does the Allen-Bradley 1771-IA handle electrical noise and transients?
The Allen-Bradley 1771-IA features built-in input filtering with nominal filtering delays specifically engineered to minimize voltage transients caused by contact bounce and radiated electrical noise. Furthermore, the module provides 1 kVAC rms opto-electrical isolation between the field input devices and the backplane logic circuitry. This robust noise immunity ensures stable and reliable signal monitoring in harsh industrial automation environments.

What safety precautions are necessary when installing the Allen-Bradley 1771-IA?
When installing or removing the Allen-Bradley 1771-IA, technicians must ensure that all power to the 1771 I/O chassis is completely removed to prevent equipment damage or electrical hazard. It is essential to verify that the backplane keying bands correspond exactly to the slots on the rear edge of the module circuit board prior to insertion. Installers should also calculate total backplane current requirements across all installed modules to prevent power supply overload.

View all FAQs →

1771-IA
Quantity
Call sales Contact
Shipping & Returns

Global Express Shipping

  • Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
  • Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
  • Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our technical warranty.
Reviews

More from this brand

Allen-Bradley 1746-IO8 SLC 500 Combination Input and Output Module
1746-IO8Allen-Bradley 1746-IO8 SLC 500 Combination Input and Output Module
Allen-Bradley 1785-L40B PLC-5/40 Controller Processor
1785-L40BAllen-Bradley 1785-L40B PLC-5/40 Controller Processor
Allen-Bradley 1746-BAS SLC 500 BASIC Module
1746-BASAllen-Bradley 1746-BAS SLC 500 BASIC Module
Allen-Bradley 1769-OW8 CompactLogix Relay Output Module
1769-OW8Allen-Bradley 1769-OW8 CompactLogix Relay Output Module
  • 1771-IA
1 1
Only 15 item(s) left in stock
View full details
Product Description
Shipping Returns
Additional details
Reviews

Global Express Shipping

  • Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
  • Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
  • Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).


For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Country of origin
United States

Technical knowledge

GE Fanuc IC693CPU364 Series 90-30 Ethernet CPU module

IC693CPU360 vs IC693CPU364: Ethernet and Power Budget

Compare the IC693CPU360 and IC693CPU364 by Ethernet interface, +5 VDC load, memory, rack limits, and replacement checks.

Allen-Bradley 1756-OF4 ControlLogix analog output module

1756-OF4 Output Wrong? Check Mode, RTB, and Scaling First

A field-first diagnostic sequence for 1756-OF4 analog output problems: channel mode, removable terminal block, scaling, and controlled electrical checks.

Allen-Bradley 1746-OA8 SLC 500 AC output module

1746-OA8 vs 1746-OA16: Output Count and Current Limits

A direct comparison of 1746-OA8 and 1746-OA16 output count, common grouping, backplane current and temperature-derated load limits.

Allen-Bradley 1761-NET-DNI DeviceNet interface

Replacing a 1761-NET-DNI: Capture These Settings First

A field checklist for recording the 1761-NET-DNI hardware series, firmware, EDS file, DF1 settings, DeviceNet address and messaging configuration before replacement.

Beckhoff EL3062-0030 two-channel 0 to 30 V EtherCAT input terminal

EL3062 vs EL3062-0030: The Input Range Changes

The EL3062 is a 0–10 V EtherCAT terminal. The EL3062-0030 is a 0–30 V variant. This checklist covers identification, scaling and commissioning.

Allen-Bradley 1769-OW8 Compact I/O relay output module

Replacing a 1769-OW8: Checks Before Moving Relay Loads

A field checklist for replacing Allen-Bradley 1769-OW8 relay output modules without losing load-group, wiring, and commissioning details.