Description
ABB DO840 3BSE020838R1 – S800 digital output module for robust field actuation
The ABB DO840 3BSE020838R1 sits in the S800 I/O family used with AC 800M and 800xA systems. From my experience, this module is typically selected when you need dependable digital outputs on a compact footprint, while keeping wiring tidy through the S800 terminal base system. It integrates on the ModuleBus, so you get straightforward engineering in 800xA and consistent diagnostics. You might notice that it’s often paired to drive solenoids, interposing relays, indicator lamps, or small contactors in machine cells and process skids.
Company’s Order Placement Process and Guarantees
- Warranty period: 365 days
- Delivery time: 1 week for in-stock items; no more than one month at the latest
- Payment: 50% advance payment; full payment prior to delivery
- Express delivery methods: FedEx, UPS, DHL
Key Features
- Seamless S800 integration – Connects on the S800 ModuleBus for unified configuration and diagnostics in 800xA/AC 800M environments.
- Reliable digital outputs – Designed to drive typical field loads such as solenoids, lamps, and interposing relays with stable switching behavior.
- Channel isolation – Output isolation helps reduce cross-channel interference and improves fault containment in many cases.
- DIN-rail terminal base system – Uses ABB S800 terminal bases (e.g., TU8xx series) to simplify wiring and replacement.
- Diagnostics support – Status LEDs and system diagnostics typically help technicians pinpoint issues faster during commissioning or maintenance.
- Compact footprint – Slim S800 form factor to fit dense cabinets without compromising serviceability.
- Proven in the field – Widely deployed in OEM skids and brownfield retrofits where compatibility and lifecycle support matter.
Technical Specifications
| Brand / Model | ABB DO840 3BSE020838R1 (S800 I/O Digital Output Module) |
| HS Code | 853890 (Parts for industrial control apparatus) |
| Power Requirements | Module electronics powered via S800 ModuleBus; external field supply provided according to load voltage |
| Signal Output Type | Digital outputs; channel isolation and field-powered design (commonly used with 24 VDC field loads) |
| Communication Interfaces | S800 ModuleBus (for connection via AC 800M and related communication interfaces) |
| Operating Temperature | Typically 0 to +55 °C (S800 I/O family rating) |
| Dimensions & Weight | Compact S800 form factor; commonly approx. 120 × 26 × 100 mm; ~0.16–0.20 kg |
| Installation Method | DIN-rail on S800 terminal base (e.g., TU810 / TU812 / TU814 series) |
| System Compatibility | AC 800M controllers with 800xA; S800 I/O infrastructure |
Application Fields
The DO840 is used where deterministic digital actuation matters and cabinet space is tight:
- Process skids (valves, solenoids, blow-off valves, indicator stacks)
- Factory automation (conveyors, pick-and-place, diverters, beacons)
- Utilities and water treatment (chemical dosing solenoids, valve islands)
- Power and marine systems (control relays, signal lamps)
- Brownfield upgrades where S800 I/O adds channels without large panel changes
Advantages & Value
- Reliability – The S800 platform has a solid track record. Field outputs remain stable even when cabinets see temperature swings and electrical noise.
- Compatibility – Works within 800xA/AC 800M environments and coexists with other S800 cards, which typically simplifies spares and training.
- Cost control – The terminal base approach reduces wiring effort and shortens swap time, helping maintenance teams keep downtime down.
- Scalability – Add outputs by slot without redesigning the entire panel. One thing I appreciate is how easy it is to extend I/O later.
- Support & lifecycle – ABB documentation and diagnostics are clear, which seems to be a real benefit during commissioning.
“We swapped an older relay bank for DO840 on an OEM skid. The wiring onto TU bases made the job quicker than expected, and the maintenance team liked the LED states for troubleshooting.” — Maintenance supervisor, beverage plant
Installation & Maintenance
- Cabinet & mounting – Install on DIN-rail with the appropriate S800 terminal base (TU8xx). Keep 50–70 mm free space above/below for airflow where possible.
- Wiring – Separate field supply wiring from low-level signals. Use ferrules and observe ABB terminal torque guidelines. Protect inductive loads with proper suppression if required by the load type.
- Environment – Typically operate within 0…+55 °C and keep humidity non-condensing. Avoid strong EMI sources or route I/O cabling in segregated ducts.
- Safety – De-energize field supplies before replacing a module. Verify output states in the DCS before and after maintenance to prevent unintended actuation.
- Routine maintenance – Periodically check terminal tightness, clean dust with dry air, and review firmware/engineering station updates as recommended for your 800xA version.
Supporting Components You May Need
- Terminal bases: TU810, TU812, TU814 (select per channel grouping and wiring style)
- ModuleBus/communication: CI801, CI840A (according to your controller and network)
- System power and accessories: SD8xx series power supplies, TB8xx shielded terminal options, labeling kits
Quality & Certifications
- Manufacturer quality systems: ISO 9001
- Product conformity: typically CE; RoHS-compliant design for S800 I/O family
- Warranty: 12 months (365 days)
If you’re standardizing on S800 I/O, the ABB DO840 3BSE020838R1 is a practical choice for digital actuation where cabinet space, serviceability, and lifecycle support matter. Share your existing TU base model and field load details, and we’ll align the configuration so commissioning goes smoothly the first time.
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