1771-IAD | Allen-Bradley PLC-5 Digital Input Module 120V AC/DC, 16 Input
1771-IAD | Allen-Bradley PLC-5 Digital Input Module 120V AC/DC, 16 Input
1771-IAD | Allen-Bradley PLC-5 Digital Input Module 120V AC/DC, 16 Input
    1771-IAD | Allen-Bradley PLC-5 Digital Input Module 120V AC/DC, 16 Input
1771-IAD | Allen-Bradley PLC-5 Digital Input Module 120V AC/DC, 16 Input

1771-IAD | Allen-Bradley PLC-5 Digital Input Module 120V AC/DC, 16 Input

Part #: 1771-IAD Manufactured by: Allen-Bradley
$444.55
$444.55
8 in Stock
Condition: New-Surplus Original Box
Shipping calculated at checkout.
Product Overview
The Allen-Bradley 1771-IAD is a PLC-5 Digital Input Module with 16 input channels compatible with 120V AC/DC. As part of S...  Read more
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Product Description P/N: 1771-IAD

Description / Specifications

Description
The Allen-Bradley 1771-IAD is a PLC-5 digital input module with 16 channels designed for 120V AC or 125V DC signals. It interfaces ON/OFF field devices such as switches, pushbuttons, and auxiliary contacts with the controller. This module is widely used in process control and machine automation applications requiring reliable AC/DC input handling.

 

 

Technical Specifications 

Typical AC Signal Delay (Off) 25 (+/- 5) ms
Module Location 1771-A1B, A2B, A3B, A3B1, A4B, 1771-AM1 and AM2 chassis.
Manufacturer Rockwell Automation 
Brand Allen-Bradley
Dimensions 3.5 x 6.5 x 2.0 in (89 x 165 x 51 mm)
Wiring Arm 1771-WH
Part Number/Catalog No. 1771-IAD
Module Type Digital AC/DC Input Module
Number of Inputs 16 Inputs
Voltage Category 120 Volts AC/DC
AC Operating Voltage 79-138 Volts
DC Operating Voltage 79-138 Volts
Backplane Current 195 Miliamperes
Max AC Off-State Current 2.8 Miliamperes
Typical AC Signal Delay (On) 5 (+/- 3) ms
Typical DC Signal Delay (On) 3 (+/- 0.1) or 10 (+/- 1) ms
Typical DC Signal Delay (Off) 25 (+/- 5) ms
Max DC Off-State Current N/A

  

 

Information About 1771-IAD

The 1771-IAD is part of the Allen-Bradley 1771 Universal I/O family, designed for use with PLC-5 systems. It features 16 isolated input channels that accept signal voltages in the range of 79–138V AC or DC. Input response can be configured with selectable delays, including 5 ms or 20 ms for AC and 3 ms or 10 ms for DC transitions, while the typical OFF delay is 25 ms. The module supports ½, 1, and 2-slot addressing, enabling flexible integration in I/O chassis such as 1771-A1B through A4B, 1771-AM1, and 1771-AM2. Connections are made through the 1771-WH wiring arm, which allows for quick installation and module replacement without disconnecting field wiring. It consumes 195 mA at 5V from the backplane and has a maximum power dissipation of 8.8 W. With built-in input filtering and optoelectrical isolation, the 1771-IAD reduces electrical noise and protects system circuitry, ensuring stable performance in industrial environments.

Key Features:

  • Design: 16-channel digital AC/DC input module for PLC-5 systems.
  • Voltage Range: Operates at 120V AC (50/60 Hz) or 125V DC, with 79–138V input range.
  • Performance: Selectable input delays (AC: 5/20 ms, DC: 3/10 ms) with 25 ms OFF delay.
  • Compatibility: Fits 1771-A1B through A4B, 1771-AM1, and AM2 chassis with keying options.
  • Connectivity: Uses the 1771-WH wiring arm for simplified wiring and hot-swappable replacement.
  • Indicators: Front panel includes 1 green module status LED and 16 red input status LEDs.
  • Protection: Optoelectrical isolation and input filtering suppress noise and transients.
  • Power Requirements: 195 mA at 5V backplane current, with max power dissipation of 8.8 W.

The 1771-IAD delivers dependable AC/DC signal interfacing and robust noise immunity for PLC-5 automation systems.


Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

Frequently Asked Questions about 1771-IAD
Question: What type of signals can the 1771-IAD accept?
Date Update:23/05/2025
Answer:

The module accepts discrete AC or DC signals with an operating range of 79–138V AC or DC. It is ideal for detecting states from switches, relays, contactors, and other field devices.

Question: What is the module’s backplane current draw and power dissipation?
Date Update:23/05/2025
Answer:

The 1771-IAD draws 195 mA at 5V from the backplane and dissipates up to 8.8 Watts of power, with a maximum thermal output of 30.1 BTU/hr.

Question: What type of input isolation and filtering does it provide?
Date Update:23/05/2025
Answer:

The module offers opto-electrical isolation to protect internal circuits and includes input filtering to reduce the effects of electrical noise.

Question: What enclosure or environmental protection does the 1771-IAD have?
Date Update:23/05/2025
Answer:

The module is designed for standard industrial panel-mounted environments. For additional protection, it should be installed within a properly rated enclosure (IP54 or above depending on the environment).

Question: Is the 1771-IAD still in production?
Date Update:23/05/2025
Answer:

No, the Allen-Bradley 1771-IAD 16-point Digital Input Module was officially discontinued on March 10, 2020, according to Rockwell Automation. It is no longer available for sale, and users are encouraged to transition to an engineering replacement.

IQElectro is not an authorized distributor.
IQElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description
The Allen-Bradley 1771-IAD is a PLC-5 digital input module with 16 channels designed for 120V AC or 125V DC signals. It interfaces ON/OFF field devices such as switches, pushbuttons, and auxiliary contacts with the controller. This module is widely used in process control and machine automation applications requiring reliable AC/DC input handling.

 

 

Technical Specifications 

Typical AC Signal Delay (Off) 25 (+/- 5) ms
Module Location 1771-A1B, A2B, A3B, A3B1, A4B, 1771-AM1 and AM2 chassis.
Manufacturer Rockwell Automation 
Brand Allen-Bradley
Dimensions 3.5 x 6.5 x 2.0 in (89 x 165 x 51 mm)
Wiring Arm 1771-WH
Part Number/Catalog No. 1771-IAD
Module Type Digital AC/DC Input Module
Number of Inputs 16 Inputs
Voltage Category 120 Volts AC/DC
AC Operating Voltage 79-138 Volts
DC Operating Voltage 79-138 Volts
Backplane Current 195 Miliamperes
Max AC Off-State Current 2.8 Miliamperes
Typical AC Signal Delay (On) 5 (+/- 3) ms
Typical DC Signal Delay (On) 3 (+/- 0.1) or 10 (+/- 1) ms
Typical DC Signal Delay (Off) 25 (+/- 5) ms
Max DC Off-State Current N/A

  

 

Information About 1771-IAD

The 1771-IAD is part of the Allen-Bradley 1771 Universal I/O family, designed for use with PLC-5 systems. It features 16 isolated input channels that accept signal voltages in the range of 79–138V AC or DC. Input response can be configured with selectable delays, including 5 ms or 20 ms for AC and 3 ms or 10 ms for DC transitions, while the typical OFF delay is 25 ms. The module supports ½, 1, and 2-slot addressing, enabling flexible integration in I/O chassis such as 1771-A1B through A4B, 1771-AM1, and 1771-AM2. Connections are made through the 1771-WH wiring arm, which allows for quick installation and module replacement without disconnecting field wiring. It consumes 195 mA at 5V from the backplane and has a maximum power dissipation of 8.8 W. With built-in input filtering and optoelectrical isolation, the 1771-IAD reduces electrical noise and protects system circuitry, ensuring stable performance in industrial environments.

Key Features:

  • Design: 16-channel digital AC/DC input module for PLC-5 systems.
  • Voltage Range: Operates at 120V AC (50/60 Hz) or 125V DC, with 79–138V input range.
  • Performance: Selectable input delays (AC: 5/20 ms, DC: 3/10 ms) with 25 ms OFF delay.
  • Compatibility: Fits 1771-A1B through A4B, 1771-AM1, and AM2 chassis with keying options.
  • Connectivity: Uses the 1771-WH wiring arm for simplified wiring and hot-swappable replacement.
  • Indicators: Front panel includes 1 green module status LED and 16 red input status LEDs.
  • Protection: Optoelectrical isolation and input filtering suppress noise and transients.
  • Power Requirements: 195 mA at 5V backplane current, with max power dissipation of 8.8 W.

The 1771-IAD delivers dependable AC/DC signal interfacing and robust noise immunity for PLC-5 automation systems.


Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

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