Allen Bradley 1771-A3B1 12-Slot I/O Chassis

Overview

The Allen Bradley 1771-A3B1 is a 12-slot I/O chassis designed for PLC-5 and 1771 series automation systems. It provides a robust mechanical and electrical platform for mounting multiple I/O modules, enabling scalable control system expansion in industrial environments. It is commonly used in large-scale legacy automation installations requiring high I/O density.

General Information

Part Number: 1771-A3B1

Manufacturer: Allen-Bradley (Rockwell Automation)

Brand: Allen-Bradley

Country of Origin: USA

Series: 1771 I/O System / PLC-5

Product Type: I/O Chassis

Mounting Type: Panel or rack mounting within control cabinet

Function: Supports multiple I/O modules with backplane communication and power distribution

Design: High-capacity modular chassis for industrial PLC systems

Power Specifications

Input Power: Supplied via external system power supply

Backplane Voltage: PLC-5 1771 series system architecture dependent

Power Distribution: Internal backplane distributes power to all installed modules

Protection: Industrial grounding and electrical isolation design

Start-Up: Controlled system initialization via PLC backplane

Communication & Interface

Interface Type: 1771 backplane communication bus

Slot Capacity: 12 I/O module slots

System Compatibility: PLC-5 and 1771 series I/O modules

Data Handling: Parallel backplane data exchange between processor and modules

Diagnostics: System-level diagnostics via PLC controller

Environmental

Operating Temperature: 0 to 60 °C

Storage Temperature: -40 to 85 °C

Humidity: 5% to 95% non-condensing

Vibration Resistance: Industrial cabinet mounting standard

Protection Rating: IP20 when installed in enclosure

Installation Environment: Industrial control cabinet required

Dimensions & Weight

Dimensions (H × W × D): 483 × 315 × 193 mm

Weight: 5.7 kg

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