DO820 ABB S800 I/O Relay Output Module 8-Channel 230V Original

Global PLC Spare HUB's Insight

From a technical standpoint, the DO820 is the premier choice for mixed-voltage isolation requirements. Its 2000 V a.c. dielectric test rating ensures that different potential levels can coexist in a single S800 I/O rack without risk of cross-talk. A key diagnostic feature is the relay supply voltage supervision; if the 24 V distributed power disappears, the DO820 immediately triggers a Warning LED and reports the error via the ModuleBus. This level of transparency allows technicians to identify power distribution issues before they escalate into system-wide failures. The built-in OSP (Output Set Predetermined) function further enhances process safety by driving outputs to a known state during communication loss.

Technical Parameters & Performance

• Brand: ABB
• Model: DO820
• Article Number: 3BSE008514R1
• I/O Series: S800 I/O
• Number of Channels: 8 Isolated Channels
• Signal Specification: 230 V a.c./d.c. (Range: 5 - 250 V)
• Maximum Output Current: 3 A Continuous
• Isolation Type: Individually isolated, channel-to-channel and to common
• Dielectric Test Voltage: 2000 V a.c.
• Rated Insulation Voltage: 250 V
• Power Dissipation: 2.9 W (Typical)
• ModuleBus Consumption: 60 mA (+5 V) / 140 mA (+24 V)
• Corrosion Protection: ISA-S71.04: G3 Rated
• Operating Temperature: 0°C to +55°C (Vertical mounting: max 40°C)

Installation & System Compatibility

• Mounting: Compatible with S800 ModuleBus on horizontal or vertical DIN rails.
• MTU Pairing: Specifically matches with TU811V1 for standard field wiring.
• Field Cable Length: Supports up to 600 meters (656 yards) without signal degradation.
• Hot Swap: Supports ModuleBus online insertion and removal (ensure site safety protocols).

Diagnostic Capabilities

• F (Fault): Red LED indicates internal module or hardware error.
• R (Run): Green LED indicates active communication and operation.
• W (Warning): Yellow LED signals missing 24 V relay supply voltage.
• O (OSP): Yellow LED confirms Output Set Predetermined mode is active.
• Channel Status: 8 dedicated LEDs provide real-time relay state indication.

Application Scenarios

• Solenoid valve control for oil and gas processing units.
• Motor starter interlocking in large-scale water treatment plants.
• Power plant auxiliary relaying for non-safety critical shutdown loops.
• Marine machinery control requiring high vibration and corrosion resistance.

Shipping & Warranty

• Global Logistics: Fast delivery via FedEx, UPS, and DHL.
• Dispatch Time: Orders are shipped within 24-48 hours.
• Warranty Period: Guaranteed with a 12-month professional warranty.
• Weight: 0.23 kg (0.5 lbs.) for easy handling and installation.

FAQ

Question: Can I control a mix of AC and DC loads on a single DO820 module?

Answer: Yes, since each channel is individually isolated, you can mix different voltage types and levels across the 8 channels.

Question: What happens to the DO820 relays if the controller communication fails?

Answer: The OSP (Output Set Predetermined) function will drive the relays to your pre-configured safe state.

Question: Is it possible to disable the 24 V relay power monitoring?

Answer: Yes, the supervision can be enabled or disabled via a software parameter through the ModuleBus.

Question: Why does the DO820 have a lower temp rating for vertical mounting?

Answer: Vertical orientation limits natural heat dissipation; reducing the ambient limit to 40°C prevents internal thermal stress.

Question: Does the DO820 support Sequence of Events (SOE) recording?

Answer: No, this module is a standard digital output; it does not support high-resolution SOE timestamping.

Selection & Buying Guide

• Current Verification: Ensure your total load per channel does not exceed the 3 A continuous rating.
• Article Number Check: Verify the 3BSE008514R1 code to ensure you receive the correct S800 hardware revision.
• Critical Spares: For 24/7 process industries, maintain one DO820 in inventory to minimize MTTR (Mean Time To Repair).
• Environment Check: If using in high-sulfur or humid areas, the G3 coating on the DO820 provides essential protection.

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