ABB DO821 3BSE013250R1 S800 I/O Digital Output Module
Configured for high-speed digital actuation in ABB S800 I/O hardware setups, the ABB DO821 3BSE013250R1, also cataloged as the DO821 Digital Output Module, provides direct physical and electrical execution. The assembly interface converts internal fieldbus control logic into 32 discrete 24 VDC transistor outputs, enabling deterministic switching for field actuators without relay contact degradation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | DO821 (3BSE013250R1) |
| Brand | ABB |
| Origin | Sweden / Switzerland |
| Weight | 0.18 kg |
| Dimensions | 119 mm x 45 mm x 102 mm |
| Operating Temp | 0 to +55 deg C |
| Power Dissipation | 3 W |
| Number of Channels | 32 transistor outputs |
| Output Voltage | 24 VDC nominal |
| Max Output Current | 0.5 A per channel |
| ModuleBus Current Draw | +5 VDC: ~100 mA; +24 VDC: ~50 mA |
| Rated Insulation Voltage | 50 V |
| Dielectric Test Voltage | 500 VDC |
| Diagnostics | Front panel LEDs: Fault (F), Run (R), OSP, Channel status |
| Protection Class | IP20 (IEC 60529) |
Backplane Bus Communication Velocity and System Integrity
The DO821 interface operates over the ABB ModuleBus system, maintaining high-speed backplane bus communication velocity and cyclic channel refresh rates. Operating on a dual-supply structure, the internal micro-logic draws approximately 100 mA from the +5 VDC ModuleBus rail and 50 mA from the +24 VDC bus rail. Integrated galvanic channel-to-system isolation (rated for 500 VDC dielectric test voltage) limits transient noise propagation from field inductive loads into the backplane logic. Furthermore, internal supervisory circuits continuously validate output states, forcing the channels to safe predefined operational parameters upon detection of ModuleBus communication disruptions or system hardware errors.
Frequently Asked Questions
Q: What module termination units (MTU) support installation of the DO821?
A: The DO821 connects directly to standard S800 MTUs, including the TU830 and TU832, which manage field wiring termination and backplane ModuleBus routing.
Q: Can channels on the DO821 be hot-swapped while the system remains powered?
A: Hot-swapping requires a compatible MTU with dual ModuleBus support, enabling replacement under power provided that local hazardous area safety procedures are maintained.
Field Installation Guidelines
Ensure complete power isolation of field signal lines and backplane power before inserting or removing the DO821 module into the MTU socket. Align the module housing vertically with the MTU guides, pushing firmly until the mechanical locking latch seats fully into place to maintain solid ModuleBus terminal contact.
Route all 24 VDC field output cables in separate wiring trunks away from high-voltage AC power lines to prevent inductive coupling. Ground the DIN rail mounting structure directly to the local earth busbar, ensuring earth bonding resistance remains below 1 Ohm for adequate EMC shielding.
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