1771-IAD | Allen Bradley PLC-5 Digital AC/DC Input Module

Product Description

The Allen Bradley 1771-IAD is a digital input module designed for the PLC-5 system. It supports both AC and DC signals within the 79–138 V operating range, making it versatile for industrial automation applications. With 16 input channels and reliable signal delay performance, this module is engineered for consistent operation in demanding environments.

Technical Specifications

• Manufacturer: Allen Bradley

• Category: PLCs

• Product Line: PLC-5

• Part Number: 1771-IAD

• Weight: 1.00 lbs (0.45 kg)

• Module Type: Digital AC/DC Input Module

• Number of Inputs: 16 channels

• DC Operating Voltage: 79–138 VDC

• AC Operating Voltage: 79–138 VAC

• Voltage Category: 120 V AC/DC

• Typical DC Signal Delay (On): 3 ms (+/- 0.1) or 10 ms (+/- 1)

• Typical DC Signal Delay (Off): 25 ms (+/- 5)

• Typical AC Signal Delay (On): 5 ms (+/- 3)

• Typical AC Signal Delay (Off): 25 ms (+/- 5)

• Max AC Off-State Current: 2.8 mA

• Max DC Off-State Current: Not applicable

• Backplane Current: 195 mA

• Wiring Arm: 1771-WH

• Module Location: Compatible with 1771-A1B, A2B, A3B, A3B1, A4B, 1771-AM1, and AM2 chassis

Application Scenarios

• Designed for PLC-5 systems requiring AC/DC input monitoring

• Suitable for process control, manufacturing, and automation environments

• Provides reliable input signal detection for mixed voltage applications

FAQ

Q: How many input channels does the 1771-IAD provide?  A: It supports 16 input channels.

Q: What is the operating voltage range?  A: The module operates between 79–138 VAC or VDC.

Q: Which wiring arm is required?  A: The compatible wiring arm is 1771-WH.

Comparison with Similar Models

• 1771-IAD: AC/DC input, 16 channels, 120 V category

• 1771-IA: AC-only input, 16 channels, lower cost option

• 1771-ID: DC-only input, 16 channels, optimized for DC applications