The Allen-Bradley 1771-ASB is a Remote I/O (RIO) adapter module designed for the 1771-series I/O chassis. It serves as a critical interface between remote I/O racks and PLC-5 programmable controllers, enabling distributed control architectures. This module supports a wide range of I/O densities, including 8-, 16-, and 32-point modules, and provides flexible addressing options to optimize the I/O image table.

Features

• Supports 1/2-slot, 1-slot, and 2-slot I/O addressing modes.
• Compatible with communication distances up to 10,000 feet (3,048 meters) at 57.6K baud.
• Integrated diagnostic LEDs for monitoring adapter status, I/O rack faults, and communication activity.
• Supports a wide variety of intelligent and specialized I/O modules.
• Includes field wiring arm and configuration jumpers for rapid deployment.

Applications

• Power Generation & Utilities: Turbine control, balance of plant (BOP), and auxiliary monitoring.
• Material Handling & Logistics: Distributed I/O for transfer lines and near-machinery control.
• Process Manufacturing: Distributed I/O clusters for chemical and refinery plant automation.
• Automotive Production: Real-time sensor and actuator monitoring over extended distances.

Technical Specifications

Installation Guidelines

• Power Down: Always remove power from the 1771 I/O chassis backplane and field wiring arm before installing or removing the module.
• Slot Placement: The 1771-ASB must be installed in the leftmost slot of the 1771 I/O chassis, which is reserved for adapter or processor modules.
• Chassis Keying: Use plastic keying bands on the backplane connector to ensure correct module insertion. For the 1771-ASB, place bands between pins 54 and 56 (upper) and pins 16 and 18 (lower).
• Environment: Ensure the module is installed in a clean, dry environment within the specified temperature and humidity ratings to prevent premature failure.

FAQs

What is the 1771-ASB?

The Allen-Bradley 1771-ASB is a Remote I/O (RIO) Adapter Module for 1771-series I/O chassis, primarily designed to interface remote racks with PLC-5 processors.

What are the key features of the 1771-ASB?

It supports up to 10,000 feet of cable (at 57.6K baud), 1-slot and 2-slot addressing modes, and diagnostics via LEDs (Active, Adapter Fault, I/O Rack Fault).

What is the difference between Series A and Series B?

Series B increased troubleshooting LEDs from 5 to 10 and increased internal RAM from 13K to 24K bytes.