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Product Overview
The ABB DO821 (Part No. 3BSE013250R1) is a 16-channel digital output module from the ABB S800 I/O family, engineered for process automation applications requiring fast, reliable, and safe switching of field devices. Each channel delivers 24 V DC PNP transistor outputs capable of driving both resistive and inductive loads.
Designed with galvanic isolation and integrated diagnostics, the DO821 supports robust performance even in harsh industrial environments. It interfaces directly with ABB AC 800M controllers and seamlessly fits within S800 I/O racks, making it ideal for distributed control systems in power, chemical, manufacturing, and utility sectors.
Key Features
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16 individually protected digital output channels
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PNP transistor outputs rated for 24 V DC
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Short-circuit and overload protection per channel
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LED indicators for module and per-channel status
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Galvanic isolation between field and system circuits
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High-speed switching suitable for real-time operations
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Compact DIN-rail mountable form factor
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Designed for integration with ABB AC 800M controllers
Technical Specifications
| Parameter | Specification |
|---|---|
| Number of Channels | 16 digital output channels |
| Output Type | Transistor, PNP (sourcing) |
| Rated Output Voltage | 24 V DC nominal |
| Output Voltage Range | 10–30 V DC |
| Maximum Output Current | 0.5 A per channel |
| Total Module Output Current | Max 8 A (total across all channels) |
| Output Protection | Short-circuit, overload, thermal shutdown |
| Output Voltage Drop | < 0.3 V @ 0.5 A |
| Switching Frequency | Up to 10 kHz |
| Galvanic Isolation | Between channels and system bus |
| Operating Temperature | -25°C to +70°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Dimensions | 45 x 102 x 119mm |
| Weight | 0.23 kg |
| CE, UL, cUL, RoHS |
Product Advantages
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High Reliability: Built-in diagnostics and protection features extend system lifespan and safety.
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Efficient Integration: Seamlessly connects with ABB AC 800M DCS systems and TU800 series terminal units.
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Compact & Scalable: Fits in modular S800 I/O racks, allowing scalable installation with minimal panel space.
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Real-Time Performance: Fast switching and stable performance ideal for time-critical industrial operations.
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Visual Feedback: Each channel has an LED indicator, enabling quick troubleshooting and operational visibility.
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Flexible Load Handling: Supports a wide range of DC loads, from solenoids to relays and lamps.
Industry Applications
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Power Generation & Distribution: Actuator and breaker control in substation automation systems
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Chemical & Petrochemical Plants: Valve and pump control in hazardous areas
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Food & Beverage Industry: Machine control for packaging and bottling systems
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Pulp & Paper Mills: Distributed I/O for monitoring and switching drive systems
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Water & Wastewater Treatment: Process control for pumps, mixers, and aerators
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Automotive Manufacturing: Conveyor control and robotic system switching
Frequently Asked Questions (FAQ)
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Q: What type of outputs does the DO821 provide?
A: It provides 16 PNP (sourcing) transistor outputs rated at 24 V DC. -
Q: Can the DO821 handle inductive loads?
A: Yes, it can drive resistive and inductive loads with short-circuit protection. -
Q: What is the maximum current supported per output channel?
A: Each output can handle up to 0.5 A. -
Q: Is the module compatible with ABB AC 800M controllers?
A: Yes, it integrates fully with AC 800M using S800 I/O. -
Q: Does the module support diagnostic functions?
A: Yes, it offers short-circuit, overload, and thermal protection diagnostics. -
Q: What is the recommended terminal base unit for the DO821?
A: It is typically mounted on a TU813 or TU830 terminal unit. -
Q: What is the operating temperature range for the DO821?
A: The module operates from -25°C to +70°C. -
Q: Does the module offer galvanic isolation?
A: Yes, between field outputs and system circuitry. -
Q: What is the weight and size of the DO821?
A: 0.23 kg, dimensions: 45 x 102 x 119mm. -
Q: Is the DO821 hot-swappable?
A: Yes, with the appropriate terminal base, it can be replaced without shutting down the system.
Related or Compatible Models (Same Series)
| Model | Description |
|---|---|
| DO820 | 16-channel digital output module (similar function) |
| DI820 | 16-channel digital input module |
| AO845 | 8-channel analog output module |
| AI845 | 8-channel analog input module |
| TU830 | Terminal unit base for S800 modules |
| CI867 | TCP/IP communication interface module |
Popular ABB Models (Same Brand)
| Model | Description |
|---|---|
| PM864 | AC 800M High-performance CPU Module |
| AI810 | 8-channel analog input module |
| DO630 | 32-channel digital output module |
| DI830 | 16-channel digital input module |
| AO844 | 8-channel analog output with voltage/current output |
| CI854A | PROFIBUS DP-V1 communication interface module |
