Product Overview

The ABB DO802 (Part Number 3BSE022364R1) is a specialized 8-channel relay output interface belonging to the S800 I/O family. This module is engineered to bridge the gap between low-voltage control logic and high-power field devices, providing galvanic isolation and robust switching capabilities for Distributed Control Systems (DCS). Unlike standard transistor outputs, the DO802 utilizes physical relay contacts to handle diverse load types, including both AC and DC voltages. Its modular, DIN-rail mounted design is optimized for high-density control cabinets where space-efficiency and reliability are critical for maintaining process continuity in complex automation architectures like Advant OCS and 800xA.

Hardware Architecture and Performance Benchmarks

The DO802 is defined by its versatile load handling and rugged electrical isolation:

• Model Identification: DO802

• Order Code: 3BSE022364R1

• Output Configuration: 8 Independent Relay Channels (Form A)

• Isolation Type: Galvanic isolation between logic and field, and between individual channels

• Maximum Switching Voltage: Up to 250V AC / 125V DC

• Load Current: Typically rated up to 2A per channel (resistive)

• Response Timing: Fast mechanical switching for synchronized control

• Environmental Resilience: Wide thermal operating range for industrial enclosures

• Physical Metrics: 13.5 x 9.2 x 5.8 cm

• Unit Mass: 0.24 kg

• Status Visualization: Per-channel LED indicators for active output verification

• Origin: Sweden

Field Utility and Control Scenarios

In Power Generation and Electrical Switchgear, the DO802 is utilized to drive interposing relays, solenoids, and circuit breaker trip coils. The high-level galvanic isolation is a fundamental safety feature in these settings, ensuring that high-voltage transients on the field side do not migrate back into the S800 I/O bus or the central controller. Its ability to switch both AC and DC loads makes it a universal tool for managing diverse auxiliary equipment within a single I/O station.

Within Water Treatment and Chemical Processing, this module provides the dependable switching necessary for motor starters, motorized valves, and dosing pumps. The DO802 is particularly valued for its "dry contact" versatility, allowing it to interface with field devices that operate on different voltage potentials without the need for additional signal conditioning. The integrated LED diagnostics allow onsite technicians to quickly identify loop failures, significantly reducing the Mean Time To Repair (MTTR) during critical process upsets.

For Industrial Manufacturing and Material Handling, the DO802 facilitates the coordination of pneumatic actuators and conveyor status indicators. Its rugged construction ensures long-term durability in high-vibration environments, while the maintenance-free relay design minimizes lifecycle costs. By integrating seamlessly with the 800xA control platform, the DO802 allows for granular control over discrete field elements, contributing to improved system scalability and overall facility efficiency.