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ABB DO828

The ABB DO828 3BSE069055R1 is a 16-channel relay digital output module designed for the ABB S800 I/O system. It is used to control external industrial equipment through relay switching signals, supporting both 125 V DC and 250 V AC applications.

The module features 16 individually galvanically isolated output channels. Each channel uses a normally open (NO) relay contact, providing flexible switching capabilities for industrial control circuits.

DO828 incorporates output status indicators, relay supply voltage supervision, optical isolation, and EMC protection components. It is suitable for industrial automation systems requiring reliable electrical switching and signal isolation.

2. Technical Parameters

3. Product Features

16 Independent Relay Output Channels

DO828 provides 16 relay output channels, allowing multiple industrial devices to be controlled through a single I/O module.

Wide AC/DC Voltage Compatibility

The module supports switching voltages from 5–250 V AC and 5–125 V DC, making it suitable for various industrial electrical control applications.

Individual Galvanic Isolation

All 16 output channels are individually isolated from one another and the circuit common. This helps reduce electrical interference and improves system protection.

Normally Open Relay Contacts

Each output channel uses a normally open relay contact, allowing external circuits to be connected or disconnected according to control commands.

Output Status Indication

Integrated LED indicators provide visual feedback on output channel conditions, making system monitoring and troubleshooting more convenient.

Relay Supply Voltage Supervision

The module monitors the relay supply voltage derived from the 12 V distributed on the ModuleBus. If this voltage disappears, an error signal is generated and the warning LED turns on.

Output Settable on Error Detection

The OSP function allows outputs to assume predetermined states when configured error conditions occur, helping maintain defined control behavior.

4. Structural Composition

The ABB DO828 consists of several functional hardware sections:

• Relay Output Circuits: Provide switching functionality for 16 independent output channels.

• Optical Isolation Barriers: Electrically isolate output signals from internal control circuitry.

• Relay Driver Circuits: Control the operation of individual relay coils.

• Electromechanical Relays: Provide normally open switching contacts for external loads.

• EMC Protection Components: Help suppress electromagnetic interference and electrical disturbances.

• LED Indicator Circuits: Display output channel status.

• Relay Supply Supervision Circuit: Monitors the internal relay supply voltage.

• ModuleBus Interface: Transfers output commands, diagnostic information, and error signals between the module and the ABB control system.

5. Application Fields

ABB DO828 is suitable for various industrial automation and electrical control applications:

• Power generation and power distribution systems.

• Oil and gas production facilities.

• Petrochemical and chemical processing plants.

• Industrial manufacturing and production lines.

• Water treatment and wastewater management.

• Electrical switchgear and circuit breaker control.

• Motor starter and contactor switching.

• Industrial valve and actuator control.

• Distributed control systems (DCS).

• ABB System 800xA process automation installations.

6. Maintenance Considerations

1. Verify that the AC or DC load voltage is within the specified operating range.

2. Ensure that the continuous output current does not exceed 2 A per channel.

3. Inspect relay contacts for wear, oxidation, or abnormal switching behavior.

4. Check field wiring and terminal connections regularly.

5. Monitor the warning LED and relay supply voltage supervision signals.

6. Verify that the OSP configuration matches the required equipment operating strategy.

7. Check the compatibility of the TU851 termination unit before replacement.

8. Consider the electrical and mechanical service life of relay contacts when switching frequently operated loads.

7. Conclusion

The ABB DO828 3BSE069055R1 is a 16-channel relay digital output module belonging to the ABB S800 I/O product family. With support for 250 V AC and 125 V DC switching, individually isolated normally open relay contacts, and integrated diagnostic functions, it provides flexible output control for industrial automation systems.