Product Short Description
Product Introduction
The ABB DO820 is an 8‑channel relay output module within the ABB S800 I/O series, designed for direct integration with AC 800M controllers and 800xA DCS platforms. It provides galvanically isolated relay outputs to switch AC and DC field loads, supporting a wide voltage range and high current capability for reliable actuation of valves, contactors, relays, alarms, and other industrial devices. Each channel features individual electrical isolation, comprehensive protection, and onboard diagnostics to ensure stable operation in harsh industrial environments. The module supports hot‑swap, pluggable terminals, and Output Safe Position (OSP) functionality to simplify installation, maintenance, and system safety.
Description
Technical Specifications
Output Configuration
- Number of Output Channels: 8 digital relay outputs, normally open (NO)
- Output Type: Galvanically isolated relay
- Voltage Range: 5 V – 250 V AC / DC
- Continuous Current: 3 A per channel
- Maximum Switching Power: 42 W DC, 600 VA AC
- Power Factor: cos φ > 0.4
- Response Time: ≤ 10 ms
- Isolation Voltage: 250 V rated
- Dielectric Test Voltage: 2000 V AC
- Maximum Field Cable Length: Up to 600 m (shielded)
Isolation & Protection
- Channel Isolation: Full galvanic isolation between channels and system electronics
- Overvoltage Category: II
- Pollution Degree: 2
- EMC Compliance: IEC 61000‑6‑2, IEC 61000‑6‑4
- Relay Power Supervision: Monitors relay coil voltage and reports faults
Power Specifications
- Modulebus +5 V DC: 60 mA typical
- Modulebus +24 V DC: 140 mA typical
- External Power: Not required
- Power Dissipation: 2.9 W typical
Physical & Mechanical Data
- Dimensions: 45 mm (W) × 119 mm (H) × 102 mm (D)
- Weight: 0.23 kg
- Mounting: Compatible with S800 I/O MTU
- Compatible MTUs: TU811, TU813, TU831, TU836, TU837, TU851
- Terminals: Pluggable screw terminals
- Ingress Protection: IP20
Environmental Ratings
- Operating Temperature: 0 °C to +55 °C
- Storage Temperature: -40 °C to +70 °C
- Relative Humidity: 5% – 95% non‑condensing
- Corrosion Class: ISA‑S71.04 G3
- Vibration/Shock: Complies with IEC 61131‑2
Certifications & Compliance
- Safety: CE, UL, CSA, EN 61010‑1, UL 61010‑1
- Marine: ABS, BV, DNV, LR
- RoHS: EU RoHS compliant
Functional Features
- 8 Isolated Relay Channels: Individual galvanic isolation for high safety and noise immunity
- Wide AC/DC Compatibility: Supports 5–250 V AC/DC loads for versatile field control
- High Load Capacity: 3 A per channel to directly drive valves, contactors, and alarms
- Output Safe Position (OSP): Automatically sets outputs to a predefined safe state on communication loss
- Comprehensive Diagnostics: LED indicators for Fault, Run, Warning, OSP, and individual channel status
- Relay Power Supervision: Continuous monitoring of coil voltage with real‑time error reporting
- Hot‑Swap Capability: Installation and replacement without system shutdown
- Pluggable Terminals: Fast wiring and easy maintenance
- Event Recording: Supports SOE with ±1.3 ms time stamp accuracy
- Robust Design: G3 corrosion resistance and marine‑grade certification for harsh environments
- Seamless Integration: Native compatibility with ABB S800 I/O, AC 800M, and 800xA systems
Application Scenarios
- Process Industries: Oil & gas, chemical, pharmaceutical, pulp & paper
- Power Generation: Thermal, hydro, wind, solar, and substation automation
- Water & Wastewater: Pumping stations, valve control, treatment systems
- Manufacturing Automation: Automotive, assembly lines, material handling
- Marine & Offshore: Shipboard systems, offshore platforms, vessel control
- Building Automation: HVAC, lighting, fire safety, access control
- Utilities: Energy distribution, pipeline monitoring, industrial alarms
- System Retrofits: Legacy DCS/PLC modernization with reliable relay outputs
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