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

Product Overview

The Allen-Bradley 1771-IAD functions as a high-density digital input module within the legacy PLC-5 platform. It bridges the gap between field-side sensors and the processor by converting 120V AC or DC signals into logic-level data. This module supports 16 discrete inputs, providing a space-efficient solution for monitoring switches, pushbuttons, and proximity sensors in rugged industrial environments. We supply this unit as 100% Brand New and Original, ensuring maximum uptime for your critical control architecture.

Technical Specifications

The following table outlines the core electrical and physical parameters of the 1771-IAD:

Engineering Advantages

• Dual-Voltage Versatility: The 1771-IAD handles both AC and DC input signals seamlessly. This flexibility eliminates the need for separate module types when integrating different field device power sources.

• Rapid Signal Processing: Precise hardware filters manage signal delays (typically 5ms for "On" states). These filters effectively suppress electrical noise and contact bounce, ensuring the PLC processor receives clean, accurate data.

• Chassis Integration: The module installs directly into standard 1771 Universal I/O chassis (including A1B, A2B, and A4B models). This modularity allows engineers to expand or maintain existing PLC-5 racks without significant mechanical re-work.

• Simplified Maintenance: Utilizing the 1771-WH wiring arm allows technicians to replace the module without disconnecting field wires. This design significantly reduces Mean Time to Repair (MTTR) during hardware swaps.

FAQs

• Does the 1771-IAD require a specific wiring arm?

  Yes, you must use the 1771-WH wiring arm. It secures to the chassis and connects the field wiring to the module's gold-plated backplane connectors, facilitating a "swing-away" design for easy maintenance.

• Can this module handle 125V DC signals?

  Yes. The operating range extends up to 138V DC. However, ensure that your off-state leakage current remains below 2.8mA to prevent the module from registering a "false on" signal.

• Is this product factory sealed?

  We guarantee that the 1771-IAD is 100% Brand New. It ships in its original packaging with the factory seal intact, ensuring it meets all original manufacturer performance standards.

• What is the primary difference between AC and DC operation for this module?

  While the voltage range is identical, the signal delay differs slightly. DC "On" delays can be as fast as 3ms, whereas AC "On" delays typically average 5ms due to the nature of the sinusoidal waveform.