ABB DO818 3BSE069053R1 Digital Output Module

The ABB DO818 (3BSE069053R1) is a high-density 32-channel digital output module designed for the S800 I/O distributed process control system. This module provides reliable 24 V DC transistor-based output switching, organized into two electrically isolated groups of 16 channels each. It is engineered to support demanding industrial environments, featuring integrated process voltage supervision and robust diagnostic capabilities.

Features

• 32-channel digital output capacity with 24 V DC signal support.
• Two isolated groups, each containing 16 channels and one dedicated process voltage supervision input.
• High-side driver technology with built-in short-circuit and over-temperature protection.
• Current-sourcing outputs with integrated current limiting for load protection.
• Optical isolation barrier between the field signals and the ModuleBus.
• Inductive load suppression and EMC protection components on every channel.
• Integrated LED status indicators for individual channel monitoring.

Technical Specifications

Applications

• Oil & Gas: Control of flow manifolds, chemical injection systems, and burner management logic.
• Chemical Processing: Reactor venting, bulk material transfer, and hazardous area isolation.
• Power & Water: Switchgear tripping, cooling fan control, and backwash valve actuation.
• Pulp & Mining: E-stop cascades, lime kiln control, and automated sorting gates.

Installation Guidelines

• Mounting: Install horizontally on standard DIN rails. Vertical mounting is possible but necessitates a reduction in maximum allowable ambient temperature 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). The module is conformal coated to meet G3 severity levels for corrosive atmospheres.
• Handling: Ensure the system is powered down before inserting or removing the module from the I/O rack to prevent electrical arcing or bus communication errors.

FAQ

What is the primary function of the DO818 module?

The DO818 is a 32-channel digital output module for the ABB S800 I/O system, used to interface control logic with field devices like valves, relays, and contactors.

How does the short-circuit protection function?

The module uses a multi-level protection strategy. It first limits current to 1.4 A. If a fault persists or temperature exceeds 135 degC, it enters a low-duty cycle PWM mode to prevent thermal damage to the internal drivers.

Can I monitor the health of the output voltage?

Yes, each of the two isolated groups includes a process voltage supervision input. If the supply voltage drops below 11 V, the module detects the loss and reports an error signal via the ModuleBus.