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The ABB DO818 (3BSE069053R1) is a high-density 32-channel digital output module designed for the S800 I/O distributed process control system. It provides reliable 24 V DC transistor-based output switching, organized into two electrically isolated groups of 16 channels. Each group includes an integrated process voltage supervision input to monitor supply health.

Features

  • 32 digital output channels configured as current sourcing with current limiting.
  • Two individually isolated groups (16 channels per group) with dedicated process voltage supervision.
  • High-side driver technology featuring short-circuit, over-voltage, and over-temperature protection.
  • Integrated EMC protection and inductive load suppression for robust operation in industrial environments.
  • Optical isolation barrier between the field signals and the internal ModuleBus.
  • Status indication LEDs provided for each output channel.

Applications

  • Oil & Gas: Control of flow manifolds, chemical injection systems, and burner management.
  • Chemical & Petrochemical: Hazardous area isolation, reactor venting, and bulk transfer control.
  • Power Generation & Water Treatment: Management of cooling fans, backwash valves, and switchgear trip signaling.
  • Pulp, Paper, & Mining: Implementation of sorting gates, lime kiln controls, and emergency stop cascades.

Technical Specifications

Model DO818 (3BSE069053R1)
Channels 32
Signal Type 24 V DC (12 - 32 V DC range)
Output Current 0.5 A per channel (max continuous)
Power Dissipation Typ 2.8 W
ModuleBus Consumption 70 mA (+5 V)
Insulation Voltage 50 V rated / 500 V AC dielectric test
Max Cable Length 600 meters

Installation Guidelines

  • Horizontal Mounting: Mount the module horizontally on standard DIN rails to ensure optimal thermal dissipation. Vertical mounting reduces the maximum operating temperature rating from 55 degC to 40 degC.
  • Airflow: Maintain a minimum clearance of 100 mm (4 inches) above and below the module to facilitate convection cooling.
  • Environment: Designed for Pollution Degree 2 environments (IEC 60664-1). Conformal coating is applied to meet G3 severity levels for corrosive atmospheres.
  • Safety: Always disconnect power before inserting or removing the module from the I/O base to prevent electrical arcing or damage to the ModuleBus pins.

FAQ

What is the primary function of the DO818 module?

The DO818 is a digital output module for the ABB S800 I/O system, used to drive field devices such as solenoids, relays, or indicators within the 800xA control environment.

How does the module handle short circuits?

The module utilizes current limiting. If a short circuit occurs, the output enters a pulsed mode to limit current. If temperatures exceed 135 degC, the module performs a selective thermal shutdown to protect the internal circuitry.

Can I isolate different voltage segments?

Yes, the 32 channels are divided into two isolated groups. This allows for the separation of power segments or different voltage domains within the allowed 12-32 V DC range.

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