Excellent PLC
Product Introduction
The Allen-Bradley 1771-IAD AC/DC Input Module is a digital input module designed for the 1771 series PLC-5 automation systems from Allen-Bradley. This module provides reliable interface capability between field devices and the PLC processor, allowing the controller to monitor digital signals from industrial equipment such as sensors, switches, and other input devices.
The 1771-IAD supports both AC and DC input voltages, making it versatile for a wide range of industrial control applications. With 16 input channels, the module can handle multiple discrete input points, converting field signals into data that the PLC can process for monitoring, control, or automation logic.
Installed directly into a 1771 I/O chassis, the module receives power from the backplane and communicates with the PLC processor through the internal bus. Its robust design ensures reliable operation in factory environments, supporting voltage variations and maintaining signal integrity even under industrial electrical noise.
The 1771-IAD is widely used in automated manufacturing systems, process control facilities, and machine automation applications where reliable digital input monitoring is required.
Product Specifications
| Parameter | Description |
|---|---|
| Product Name | Allen-Bradley 1771-IAD AC/DC Input Module |
| Manufacturer | Allen-Bradley |
| Series | 1771 PLC-5 I/O System |
| Module Type | AC/DC digital input module |
| Input Channels | 16 |
| Nominal Input Voltage | 120 VAC @ 50/60 Hz; 125 VDC |
| On-State Voltage Range | 79 to 138 VAC/DC |
| Backplane Current | 195 mA @ 5 VDC |
| Operating Frequency | 50/60 Hz |
| Installation Location | 1771 I/O chassis |
| Dimensions | 165 x 51 x 89 mm |
| Weight | 0.45 kg |
Applications
● Industrial PLC-Based Control Systems
Monitors discrete AC or DC signals from sensors, switches, and other field devices.
● Manufacturing Automation Equipment
Provides input monitoring for machinery and production lines requiring high-speed digital signal acquisition.
● Process Control Facilities
Used in industries such as chemical, water treatment, and power generation to acquire digital input data for process control.
● Machine Automation Panels
Integrates multiple input channels into the PLC system for comprehensive machine monitoring.
● Discrete Signal Monitoring
Supports the detection and processing of on/off status signals in automated systems.
Advantages
● Dual AC/DC Input Capability
Supports both AC and DC signals, providing flexibility in industrial applications.
● High Channel Density
16 input channels allow efficient monitoring of multiple devices in a single module.
● Reliable Backplane Communication
Ensures consistent signal transmission to the PLC processor through the 1771 I/O chassis.
● Industrial Electrical Tolerance
Operates reliably across the nominal input voltage range and is resistant to common electrical disturbances.
● Compact Modular Design
Designed to fit standard 1771 chassis slots, conserving cabinet space while supporting multiple channels.
● Versatile Application Support
Suitable for manufacturing, process automation, and machinery control where digital input monitoring is critical.
