ABB DO820 – Digital Output Module for AC 800M Control Systems

1. Overview

The ABB DO820 is a Digital Output Module designed for ABB’s AC 800M automation platform, providing reliable interfacing between the control system and external field devices. This module delivers 16 individually isolated 24 V DC digital outputs, ensuring precise and safe control of actuators, solenoids, relays, and indicators in a wide range of industrial automation applications.

Its modular design, advanced diagnostics, and robust construction make it ideal for process control, manufacturing automation, and power management systems, offering high performance and easy integration within ABB’s distributed control architecture.

2. Technical Specifications

3. Structure and Design

The ABB DO820 module features a compact and modular enclosure, designed for mounting on DIN rails within the S800 I/O system. The board utilizes solid-state electronic switching for durability and long service life, eliminating the need for mechanical relays.

Each channel is optically isolated, providing strong protection against voltage surges and ground loops. LED indicators on the front panel display the status of each output channel, facilitating quick diagnostics during commissioning and maintenance.

A removable terminal base (TU810 or TU812) allows for easy field wiring and module replacement without disturbing system connections, reducing downtime during servicing.

4. Key Features

16-channel digital output configuration for versatile control

High isolation and protection for enhanced reliability

Channel diagnostics and status LEDs for easy fault detection

Hot-swap capability minimizes system downtime

Compact and modular design suitable for space-limited panels

Seamless integration with ABB’s S800 I/O and AC 800M systems

Durable solid-state outputs extend operational life

5. Application Areas

The DO820 module is extensively used across various industries for automation and process control, including:

Oil & Gas: Controlling solenoid valves, actuators, and safety signals

Power Generation: Interfacing turbine and generator control systems

Water & Wastewater: Managing pump control and indicator signaling

Pulp & Paper: Automating motor-driven processes

Manufacturing Automation: Controlling robotic arms, conveyors, and packaging equipment

In all these environments, it ensures high signal accuracy, electrical safety, and stable output performance.

6. Installation and Maintenance

Installation Steps:

Mount the terminal base (TU810/TU812) securely on the DIN rail.

Plug the DO820 module into the base until the locking mechanism clicks.

Connect output devices to the corresponding terminals.

Power on the system and observe LED indicators for normal operation.

Maintenance Tips:

Periodically inspect connections for corrosion or looseness.

Avoid electrostatic discharge (ESD) during handling.

Keep operating conditions within specified temperature and humidity limits.

Replace only with genuine ABB-certified modules to maintain system reliability.

7. Advantages at a Glance

High-density digital outputs in a compact format

Built-in protection and diagnostics for enhanced safety

Flexible mounting and wiring options

Proven reliability in industrial automation environments

Compatible with various S800 I/O configurations

8. Conclusion

The ABB DO820 Digital Output Module exemplifies ABB’s commitment to industrial reliability and intelligent design. Its robust electrical isolation, diagnostic functionality, and modular flexibility make it a trusted choice for complex control systems demanding high uptime and precision. Whether integrated into process automation, power control, or manufacturing setups, the DO820 ensures stable performance and effortless scalability within the AC 800M ecosystem.