Configured for high-voltage discrete signal switching in S800 I/O distributed control network platforms, the ABB DO820 (3BSE008514R1 Digital Output Module) provides direct physical electrical execution via 8 individually galvanically isolated relay channels.

Model Identification and Configuration

• Base Model: DO820
• Part Number: 3BSE008514R1
• Output Type: Relay (Normally Open)
• Series: S800 I/O

Hardware Specifications

Backplane Communication and Deterministic Performance

The DO820 integrates with the S800 I/O backplane to facilitate deterministic network control. The module architecture is engineered for I/O density scaling, allowing for coherent integration into existing control nodes without exceeding backplane power budgets. Firmware compatibility ensures stable bus communication, with specific attention to synchronization within the Modulebus. The logic interface is optimized for deterministic response times, maintaining status consistency under varying load conditions.

Ordering Information

• 1 unit: DO820 Digital Output Module
• 1 set: Technical documentation and conformity certificates
• 1 unit: Protective dust cover for Modulebus connector

Field Installation and Operational Guidelines

• Mechanical Installation:
  • Ensure the S800 Module Termination Unit (MTU) is properly secured to the DIN rail.
  • Align the DO820 connector with the MTU backplane slot and lock the mechanical latch.
• Wiring and Signal Routing:
  • Maximize field cable distance up to 600 meters, ensuring appropriate gauge for current load.
  • Utilize shielded conductors for high-voltage (230 VAC) paths to comply with electromagnetic compatibility (EMC) requirements.
  • Verify individual channel isolation before applying field power to prevent cross-channel voltage back-feed.

Frequently Asked Questions

• Q: Is the DO820 capable of hot-swapping?

  A: Yes, this module supports hot-swapping within the S800 I/O system, allowing for replacement without interrupting the power to the backplane or the primary controller.

• Q: What is the rated switching current for the relay contacts?

  A: Each channel is rated for a continuous switching current of 3 A. Users must derate this based on load type (inductive vs. resistive).

• Q: Are the channels individually isolated?

  A: Yes, each of the 8 channels features galvanic isolation to prevent fault propagation between independent field circuits.

• Q: How much current does the module draw from the backplane?

  A: The module consumes 60 mA from the +5 V supply and 140 mA from the +24 V Modulebus rail.

• Q: What is the function of the 2000 VAC dielectric test rating?

  A: This verifies the insulation integrity of the galvanic barrier, ensuring safety and signal isolation under high-voltage conditions up to 250 VAC.

• Q: Does this module support redundant configuration?

  A: Yes, when utilized with appropriate S800 MTUs and system controller settings, this module supports redundant output pair configurations.

• Q: What is the event recording accuracy?

  A: The module maintains an event recording accuracy of -0 ms to +1.3 ms, sufficient for standard sequence-of-event (SOE) tracking.

• Q: Is the relay contact configuration fixed?

  A: The DO820 provides Normally Open (N.O.) contact outputs for all 8 channels as standard.