Product Overview

The Allen-Bradley 1771-ASB/E is a high-performance Universal Remote I/O (RIO) adapter module specifically engineered for the PLC-5® automation platform. It functions as the primary communication link between a supervisory controller and remote 1771 I/O chassis. By occupying the adapter slot (the leftmost slot) of a 1771 rack, this module allows for a distributed control architecture, enabling I/O hardware to be situated near field sensors and actuators while the central processor remains in a secure, centralized location.

The Series E designation of the 1771-ASB provides enhanced backplane scanning capabilities and improved diagnostic reporting compared to earlier revisions. It is an essential component for facilities looking to minimize long-distance hardwiring and reduce installation labor costs. Through the use of a single "Blue Hose" (twinaxial) cable, the 1771-ASB/E facilitates the transfer of discrete and block transfer data across expansive industrial sites.

Network Configuration and Performance

The 1771-ASB/E adapter is designed for maximum flexibility in network topology. It supports standard RIO baud rates, which can be configured via internal DIP switches to match the requirements of the network distance and desired throughput.

• Supported Baud Rates: 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps.

• Extended Range: At the 57.6 Kbps setting, the module can communicate over distances up to 10,000 feet (3,048 meters).

• Addressing Modes: Supports 2-slot, 1-slot, and 1/2-slot addressing, allowing for high-density I/O configurations within a single remote rack.

• Data Handling: Capable of executing both discrete transfer (bit-level) and block transfer (multi-word) instructions to handle complex analog or intelligent modules.

The front panel features a clear array of LED indicators that provide real-time status updates for "Active" network connection, "Adapter Fault," and "I/O Rack Fault." These diagnostics allow maintenance personnel to quickly distinguish between wiring issues and hardware failures, reducing system downtime.

Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model Number: 1771-ASB/E

• Module Type: Remote I/O (RIO) Adapter

• Compatible Chassis: 1771-A1B through 1771-A4B

• Backplane Current Draw: 1.0A @ 5V DC

• Communication Link: Universal Remote I/O (Twinaxial Cable)

• Isolation Voltage: 1500V AC (RMS)

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Storage Temperature: -40°C to 85°C (-40°F to 185°F)

• Humidity: 5% to 95% (Non-condensing)

• Dimensions: 3.5 x 13.0 x 14.5 cm

• Weight: 0.9 kg

Key Operational Features

• Distributed Architecture: Significantly lowers the total cost of ownership by reducing the copper wiring needed for remote field devices.

• Enhanced Diagnostics: Series E firmware provides superior error checking and rack status reporting for critical process stability.

• High-Speed Backplane Interface: Optimized for rapid data exchange between the RIO network and local I/O modules, ensuring low-latency response times.

• Proven Reliability: Built to withstand the harsh electrical and mechanical environments of industrial manufacturing, including high-vibration and EMI-intensive areas.