ABB DO820 (3BSE008514R1) – Reliable 24 VDC Digital Output Module for S800 I/O Systems

The ABB DO820 (3BSE008514R1) is a digital output module for the S800 I/O platform, typically used to switch 24 VDC loads in DCS/PLC applications. From my experience, it suits plants that need stable, channel-dense output control without complicated setup—think valve solenoids, contactor coils, interposing relays, and light stacks. It slides onto a TU8xx termination unit and integrates straight into the ModuleBus with minimal fuss.

Order Placement Process and Guarantees

• Warranty: 365 days
• Lead time: 1 week if in stock; no more than 1 month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• 16-channel 24 VDC digital outputs – suited for driving solenoids, relays, and indicators across two logical channel groups.
• Transistor (sourcing) outputs – in many cases, this simplifies wiring with common 24 VDC field supplies.
• Short-circuit and overload consideration – typically designed for robust industrial loads; use proper external protection for inductive devices.
• S800 ModuleBus integration – plug-and-play with ABB 800xA/AC800M-based systems via TU8xx termination units.
• Compact footprint – saves cabinet space while keeping wiring accessible on front terminals.
• Status and diagnostics – per-channel status LEDs help speed up commissioning and troubleshooting.

Technical Specifications

Application Fields

The DO820 usually finds a home in process and factory automation where 24 VDC devices are standard:

• Power, water & wastewater – driving solenoids, blowers, dampers, and pump starter relays.
• Oil & gas and chemicals – interlocks, valve actuation, burner management outputs (with proper safety design).
• Metals, pulp & paper – line controls, e-stops through interposing relays, visual/audible annunciation.
• Pharma and food – machine signaling, diverters, packaging actuators, where compact output density matters.

Advantages & Value

• Reliability that reduces downtime – stable 24 VDC control, with straightforward diagnostics to isolate faults faster.
• Compatibility with ABB 800xA ecosystems – no adapters required; pairs cleanly with AC 800M controllers via S800 I/O.
• Cabinet efficiency – 16 outputs per module helps consolidate panel space and wiring routes.
• Lifecycle confidence – ABB’s long-running S800 platform means parts and know-how are widely available.
• Procurement simplicity – standard HS code, predictable logistics, and flexible shipping windows.

Installation & Maintenance

• Cabinet environment – mount on DIN rail using TU8xx; keep ambient 0…55°C with adequate ventilation.
• Wiring – use separate 24 VDC field supplies per group when necessary; observe polarity and use ferrules for vibration-prone panels.
• Protection – add external fuses or circuit breakers sized to your load; for inductive loads, fit flyback diodes or RC snubbers.
• Grounding – maintain a clean reference ground; route I/O separately from power to minimize noise.
• Routine checks – periodically re-torque terminals, vacuum dust, and verify channel function in the control system.
• Firmware & documentation – keep controller/engineering tool versions aligned with your S800 base firmware where applicable.

Supporting Components (Typical Pairings)

• TU810 / TU812 Termination Units – DIN-rail base units that provide the ModuleBus connection and field terminals.
• Power distribution terminals – to split 24 VDC supplies across channel groups and external devices.
• Interposing relays – when switching higher voltages or currents beyond the DO820’s DC transistor ratings.
• Surge suppression – diode arrays or RC snubbers for inductive loads to extend output channel life.

Quality & Certifications

• Certifications: CE; commonly supplied with cULus recognition and RoHS compliance for S800 series.
• Manufacturing: ABB production under ISO 9001 quality systems.
• Warranty: 365 days replacement/repair support window.