ABB DO820 3BSE008514R1 – Digital Output Module for S800 I/O
1. General Description

The ABB DO820 (Part No. 3BSE008514R1) is a 16-channel digital output module designed for the S800 I/O series. It is used to drive external field devices such as relays, solenoids, lamps, and contactors, making it widely applied in distributed control systems (DCS), including ABB 800xA and AC 800M platforms.
The module offers high reliability, galvanic isolation, and electronic short-circuit protection, ensuring long-term stable operation in demanding industrial environments.

2. Main Functions & Advantages

16 isolated digital output channels

Supports 24 V DC high-side switching

Output current up to 0.5 A per channel

Built-in protection against overload and short circuit

Fast switching suitable for both logic and control applications

LED indication per channel for quick diagnostic checks

Hot-swappable module — no shutdown required for replacement

Conformal coated PCB for harsh industrial applications (dust, humidity, corrosive gases)

3. Technical Parameters (non-table format for this model)

Output Type: 24 V DC, current sourcing (PNP)

Channels: 16 outputs, individually isolated

Max Load Current: 0.5 A per output, 8 A total module limit

Isolation: 500 V between field and logic

Power Consumption: Approx. 4 W

Output Delay: <1 ms typical

Field Power Supply Range: 19–30 V DC

Diagnostics: Open-wire detection, short-circuit protection, power status

Module Mounting: TU830, TU833, TU835 terminal bases

Operating Temp Range: −25°C to +70°C

4. Module Design & Structure

Front LED Indicators – One per channel for output status

Electronics Board – Handles output switching and protections

Backplane Connector – Transfers power and data to the system unit

Field Terminal Interface – Connects to terminal base for external wiring

Internal Current Limiter – Ensures safe shutdown during overload events

5. Typical Application Fields

Power plants and turbine control systems

Oil & gas automation skids

Manufacturing lines and conveyor control

Water treatment and desalination facilities

Petrochemical and refinery DCS output control

HVAC, motors, solenoid valves, PLC interlocking circuits

Emergency shutdown (ESD) and process safety panels (when used with relays)

6. Installation & Wiring Tips

Mount DO820 onto approved TU8xx terminal base before power-up

Use proper wire gauge (0.5–2.5 mm²) for field outputs

Ground the shield at only one end to prevent ground loops

Protect inductive loads by installing flyback diodes or RC suppressors

Verify channel polarity before energizing to avoid reverse connection

Redundancy supported through dual-module configuration in 800xA

7. Maintenance & Lifecycle Notes

Each channel provides fault feedback to the control system

Module can be replaced online in a powered system (hot-swap capability)

Recommended spare strategy: 1 module per 20–25 running modules

Clean with dry air only — avoid solvents due to protective coating

Firmware and hardware revisions visible through asset management tools in 800xA

8. Additional Information

Fully compatible with DI801, AI801, AO801, CI801, etc. in S800 I/O rack

Complies with CE, UL, and industrial EMC standards

Used in both single and redundant I/O stations