The ABB DO840 (3BSE020838R1) is a 16-channel digital output module from the S800 I/O family, designed for supervised 24V DC current-sourcing loads in both single and redundant configurations . As part of ABB's System 800xA and AC800M ecosystem, this module delivers robust performance for demanding industrial automation applications requiring high reliability and advanced diagnostics.
The DO840 features 16 current-sourcing output channels arranged in two isolated groups of eight, each with independent process-voltage supervision . Built-in protection mechanisms including current limiting, over-temperature protection, and inductive load suppression ensure stable operation even in harsh industrial environments.
Item No :
DO840 3BSE020838R1Order(MOQ) :
1Payment :
EXWProduct Origin :
SwedenShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
0.5kgProducts Description
ABB DO840 3BSE020838R1 Digital Output Module in stock
| Model Number | DO840 3BSE020838R1 |
| Place of Origin | Sweden |
| Dimension/Weight | 0.5kg |
| Condition | New and Original |
| Warranty | 1 year |
| Shipping term | DHL Fedex TNT EMS UPS |
| Payment | TT / Western Union |
| Delivery time | 3-5 days |
| Service | 24 Hours Online Service |
HART pass-through:
Media: The system has pass-through functionality and can be connected either as local I/O (S800) or as Remote I/O.
Purpose: Makes HART data available for clients, e.g. Fieldbus Builder
Protocol: HART protocol
SW interface: Process data via 4 – 20 mA signal are I/O copied to application variables. HART data (status and diagnostic data) are available via “pass-through”.
HW Interface: S800 I/O modules AI845, AI895, AO845 and AO845 S900 I/O modules AI930/931 and AO930
OPC interface: Yes, via HART OPC server
16 Supervised Digital Outputs – 24V DC current-sourcing channels for reliable field device control
Two Isolated Groups – 8 channels per group with independent process-voltage supervision
Redundancy Support – Designed for single or redundant configurations in high-availability systems
Built-in Protection – Current limiting, over-temperature protection, and inductive load suppression per channel
OSP (Output Set Point) Support – Predetermined safe output state during communication or module faults
Advanced Diagnostics – Comprehensive self-checks with LED status indicators for each channel
Hot Swap Capability – Replace modules without system shutdown
ModuleBus Integration – Seamless connection to ABB S800 I/O and AC800M controllers
| Specification | Details |
|---|---|
| Catalog Number | 3BSE020838R1 |
| Model | DO840 |
| Product Type | Digital Output Module |
| Output Channels | 16 |
| Output Type | Current sourcing, 24V DC (high-side drive) |
| Signal Voltage Range | 19.2 – 32V DC |
| Continuous Current per Channel | 0.5 A max |
| Output Grouping | Two isolated groups of 8 channels |
| Process-Voltage Supervision | One supervision input per group |
| Protection Features | Current limiting, over-temperature, inductive load suppression |
| Error Handling | OSP (Output Safe Preset) supported |
| Power Dissipation | Typical 4.3W |
| Current Consumption (ModuleBus) | 130 mA (5V) / 200 mA (24V, external) |
| Isolation | 500V AC dielectric strength |
| Response Time | < 1 ms |
| Max Field Cable Length | 600 m (shielded) |
| Operating Temperature | 0 to +55°C (vertical mounting: 40°C) |
| Protection Class | IP20 |
| Dimensions (W × H × D) | 45 × 119 × 102 mm |
| Weight | Approx. 0.15 kg |
| Certifications | CE, ATEX Zone 2, DNV, UL 508 |
The DO840 requires a compatible termination unit. Approved MTUs include :
TU810V1 – Standard screw termination
TU812V1 – Screw termination with fuse
TU814V1 – Screw termination with relay
TU830V1 – Spring termination
TU833 – Spring termination with fuse
TU842 – Redundant configuration
TU843 – Redundant with fuse
TU852 – Extended temperature range
Keying Code: CE – mechanical anti-insertion keying prevents insertion of incorrect module type.
Redundancy Support: The DO840 is designed for high-availability applications. In redundant configurations, two modules form a pair that provides seamless takeover if the primary module fails .
OSP (Output Safe Preset): Configure predetermined output states to be applied upon module or communication failure. Ensure proper configuration before commissioning .
Voltage Supervision: Each output group includes process-voltage monitoring. Loss of the supervised voltage triggers warnings and can be read as diagnostic errors via the bus .
Cable Length: Maximum field cable length is 600 meters when using shielded cable .
The ABB DO840 is suited for demanding discrete output control across multiple industries:
Process Control – Driving solenoid valves, actuators, and alarms in chemical, oil & gas, and water/wastewater plants
Power Generation – Control of contactors, relays, and auxiliary systems in thermal and hydroelectric plants
Factory Automation – Switching of conveyors, packaging equipment, and manufacturing systems
Safety-Critical Systems – Redundant configurations for high-integrity applications (e.g., emergency shutdown, safety interlocks)
Q1: How many output channels does the DO840 provide?
The DO840 provides 16 digital output channels arranged in two isolated groups of 8 channels .
Q2: What is the maximum current per channel?
Each channel supports a maximum continuous output current of 0.5 A with built-in current limiting protection .
Q3: What is the output type?
The DO840 features current-sourcing (high-side drive) outputs at 24V DC .
Q4: Does the DO840 support redundancy?
Yes. The DO840 is designed for both single and redundant configurations, making it ideal for high-availability systems where uninterrupted operation is critical .
Q5: What protection features are built into the module?
Each output channel includes current limiting, over-temperature protection, and inductive load suppression to ensure reliable operation and protect connected devices .
Q6: What is the OSP function?
OSP (Output Set Point / Output Safe Preset) allows the module to automatically set outputs to a predetermined safe state in the event of a communication or module fault .
Q7: Which MTUs are compatible with the DO840?
Approved MTUs include: TU810V1, TU812V1, TU814V1, TU830V1, TU833, TU842, TU843, and TU852 . Always verify the specific TU revision for your chassis.
Q8: What is the maximum field cable length?
The maximum recommended field cable length is 600 meters when using shielded cable .
Q9: What certifications does the DO840 carry?
The module carries CE, ATEX Zone 2, DNV, and UL 508 certifications .
Q10: Is the DO840 compatible with System 800xA and AC800M?
Yes. The DO840 is part of the S800 I/O system and integrates seamlessly with ABB System 800xA and AC800M controllers via the ModuleBus .
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