ABB DO828 3BSE069055R1 Digital Output Module

Configured for high-density relay output switching in ABB System 800xA and S800 I/O platforms, the ABB 3BSE069055R1, also cataloged as the DO828 Digital Output Module, provides direct physical/electrical execution across complex process control networks. The hardware converts internal system commands into 16 individually isolated relay output signals, driving actuators, solenoid valves, and power contractors without requiring interposing relays. By incorporating individual channel-to-channel galvanic isolation, the unit protects upstream ModuleBus backplane logic against field-side voltage transients, maintains signal separation across alternating current and direct current field loops, and eliminates common-mode ground loops across heavy industrial installation environments.

Hardware Specifications

Backplane Bus Communication Velocity and System Diagnostics

The DO828 module interfaces directly with the redundant ABB S800 I/O ModuleBus backplane, maintaining deterministic communication cycle times to ensure real-time command execution. Internal microprocessors supervise the local 12 V power converter supplying the relay coil drives, continuously reporting hardware execution state back to the central controller. Furthermore, the firmware supports full flash compatibility, permitting online firmware updating without physically disrupting adjacent I/O modules on the same DIN rail segment. Front-panel LED arrays provide immediate visual verification of ModuleBus communication state (Run), module fault conditions (Fault), output status (OSP), and channel-level relay contact actuation.

Frequently Asked Questions

Q: Can the DO828 module be hot-swapped while the rest of the S800 I/O station remains powered?

A: Yes, the DO828 supports live insertion and removal (hot-swapping) when installed on a compatible Module Termination Unit such as the TU851, provided field loop voltages do not exceed safety limits during servicing.

Q: What happens to the 16 relay output channels if backplane ModuleBus communication fails?

A: The module executes its configurable Output State Option (OSP) parameter, immediately driving relay channels to a predetermined fail-safe state (either de-energized open or held at the last valid value).

Q: Does the DO828 require external surge protection for inductive loads?

A: While internal contact rating handles up to 2 A continuous, installing external RC snubber networks across AC inductive solenoids or freewheeling diodes across DC coils extends relay contact life and limits high-frequency transient feedback into the field wiring.

Field Installation Guidelines

Mount the module by sliding it vertically onto the pre-wired S800 Module Termination Unit (such as the TU851) until the locking latches engage firmly. Ensure that the mechanical keying code matches the terminal unit base to prevent accidental insertion into an incompatible I/O slot.

Route all field wiring through dedicated cable ducts, ensuring clear physical separation between sensitive 24 VDC analog sensor cables and the 250 VAC relay load cables connected to the DO828 terminal block. Strip field conductors according to terminal unit specifications, maintaining firm screw torque to avoid thermal hot-spots. Bond all cable shielding to the cabinet grounding bar using low-impedance clamps located immediately at the cable entry point to maximize noise immunity.