Product Overview

The ABB DO818 (3BSE069053R1) is a high-density 32-channel digital output module designed for the S800 I/O distributed control system. Engineered for robust process automation, this module provides 24 V DC transistor-based outputs, organized into two electrically isolated groups of 16 channels. Each group incorporates dedicated process voltage supervision to ensure reliable monitoring of field power.

Features

• 32 digital output channels with 24 V DC sourcing capability.
• Two independently isolated groups (16 channels per group) with individual process voltage supervision.
• Integrated short-circuit, over-voltage, and over-temperature protection for every channel.
• High-side driver architecture with inductive load suppression and EMC shielding.
• Optical isolation barrier between the field signals and the ModuleBus.
• Status indication via onboard LEDs for each output channel.
• Conformal coating compliant with G3 severity levels for corrosive environments.

Applications

• Oil & Gas: Flow manifold control, chemical injection systems, and burner management.
• Chemical Processing: Reactor venting, hazardous area isolation, and bulk material transfer.
• Power & Water: Switchgear tripping, cooling fan management, and valve actuation.
• Heavy Industry: E-stop cascades, sorting gates, and kiln control.

Technical Specifications

Installation Guidelines

• Mounting: Horizontal mounting on standard DIN rails is recommended for optimal thermal performance. Vertical mounting reduces the maximum allowable ambient temperature from 55 degC to 40 degC.
• Airflow: Ensure a minimum clearance of 100 mm above and below the module to facilitate natural convection.
• Environment: Designed for Pollution Degree 2 environments. Ensure the cabinet is properly sealed in harsh or corrosive plant conditions.
• Safety: Always disconnect field power and ModuleBus power before attempting to remove or install the module to prevent electrical damage or unexpected signal states.

Frequently Asked Questions

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 interface control logic with field devices such as valves, contactors, and actuators requiring 24 V DC signals.

How does the module handle short circuits?

The module utilizes a two-stage protection strategy. Initial current limiting is set to 1.4 A. If an over-temperature condition occurs due to a sustained fault, the module switches to a low-duty cycle PWM mode to prevent component damage.

Can I isolate the output groups?

Yes, the 32 channels are divided into two galvanically isolated groups, allowing for flexible wiring and independent voltage supervision for each section.