Allen Bradley 1771-A1B 4-Slot I/O Chassis

Overview

The Allen Bradley 1771-A1B is a 4-slot I/O chassis designed for PLC-5 and 1771 series control systems. It provides a structural and electrical backbone for installing I/O modules, ensuring stable communication and power distribution within industrial automation cabinets. It is widely used in legacy but still operational industrial control systems.

General Information

Part Number: 1771-A1B

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 inside control cabinet

Function: Provides mechanical housing and backplane connections for I/O modules

Design: Modular industrial chassis for PLC I/O expansion

Power Specifications

Input Power: Supplied via external system power supply

Backplane Voltage: System-dependent (PLC-5 1771 series architecture)

Power Distribution: Internal backplane distribution to installed modules

Protection: Industrial grounding and system-level electrical isolation

Start-Up: Sequential module initialization via backplane

Communication & Interface

Interface Type: 1771 backplane communication bus

Slot Capacity: 4 I/O module slots

System Compatibility: PLC-5 and 1771 series modules

Data Handling: Parallel backplane data exchange between modules and processor

Diagnostics: System-level fault detection 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-grade cabinet installation standard

Protection Rating: IP20 when installed in enclosure

Installation Environment: Requires industrial control cabinet

Dimensions & Weight

Dimensions (H × W × D): 315 × 229 × 193 mm

Weight: 3.6 kg

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