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Product Introduction
The Allen-Bradley 1771-ALX Local I/O Adapter Module is an interface module used in PLC-5 and 1771 series automation systems developed by Allen-Bradley. The module functions as a local I/O adapter that connects the processor with the I/O chassis, allowing the controller to communicate with installed input and output modules through the backplane.
In a PLC architecture, the local I/O adapter plays an important role in coordinating data exchange between the central processor and field I/O devices. The 1771-ALX manages communication across the chassis backplane, enabling efficient transmission of control commands and status information between the processor and connected modules.
The module is designed for installation in 1771 I/O chassis systems and operates as part of the PLC-5 control platform. Its industrial design supports stable performance in factory environments, making it suitable for manufacturing control systems, process automation facilities, and large machinery installations.
With reliable communication capability and compatibility with a wide range of 1771 series modules, the 1771-ALX helps ensure efficient integration of field devices into PLC-based automation systems.
Product Specifications
| Parameter | Description |
|---|---|
| Product Name | Allen-Bradley 1771-ALX Local I/O Adapter Module |
| Manufacturer | Allen-Bradley |
| Series | 1771 PLC-5 I/O System |
| Module Type | Local I/O adapter module |
| Function | Provides communication between PLC processor and I/O modules through the chassis backplane |
| Backplane Current Consumption | 1.2 A |
| Operating Voltage | 5 V DC |
| Operating Temperature | 0–60 °C (32–140 °F) |
| Storage Temperature | −40–85 °C (−40–185 °F) |
| Relative Humidity | 5–95% non-condensing |
| Installation Location | Installed in 1771 I/O chassis |
| Dimensions | 165 x 51 x 89 mm |
| Weight | 0.6 kg |
Applications
● PLC-5 Industrial Control Systems
Acts as the communication interface between the PLC processor and local I/O modules installed in the chassis.
● Manufacturing Automation Equipment
Used in factory control systems to manage communication between sensors, actuators, and PLC control modules.
● Process Control Installations
Applied in industries such as chemical processing, water treatment, and power generation where reliable I/O communication is required.
● Machine Control Platforms
Supports automated machines that rely on PLC-based monitoring and control of multiple field devices.
● Distributed I/O Architectures
Provides local communication capability within modular PLC systems that include multiple I/O racks.
Advantages
● Reliable Backplane Communication
The module enables stable data transfer between the PLC processor and I/O modules through the chassis backplane.
● Designed for PLC-5 Systems
Fully compatible with the 1771 I/O platform, supporting integration with a wide range of PLC-5 modules.
● Industrial Environmental Performance
Operates reliably across typical industrial temperature ranges and humidity conditions.
● Simplified System Architecture
Reduces wiring complexity by enabling centralized communication through the chassis backplane.
● Stable Operation in Control Cabinets
Engineered to operate continuously in industrial control environments with minimal maintenance requirements.
● Flexible System Integration
Allows system designers to integrate numerous I/O modules within a structured PLC automation architecture.
