Product Introduction
When your automation system demands precise and protected control of actuators, the ABB DO840 Digital Output Module delivers. This module provides 16 digital outputs, each capable of a maximum continuous output current of 0.5 A. The outputs are current limited and protected against over temperature, ensuring reliable operation even under fault conditions. The DO840 is part of the ABB S800 series, designed for modular and scalable I/O solutions. Its outputs are divided into two isolated groups of eight channels, each with its own voltage supervision input, enhancing system integrity.
Technical Specifications Breakdown
The DO840 operates with a 24 V d.c. signal specification (19.2 - 32 V d.c.) and supports current sourcing outputs. Key specifications include:
- Channel Count: 16 channels, split into two isolated groups of eight.
- Output Current: 0.5 A per channel, with short circuit proof current limiting.
- Power Consumption: Typ. 4.3 W, with current consumption of 130 mA on the +5 V Modulebus and 200 mA on the +24 V external supply.
- Isolation: Groupwise isolated from ground with a rated insulation voltage of 50 V and dielectric test voltage of 500 V a.c.
- Diagnostics: Front LEDs for Fault, Run, Warning, and OSP status, plus individual channel status indicators. Supervision of process power per group.
These specifications ensure the module can handle demanding loads while providing clear diagnostic feedback for maintenance.
Industry Applications
The DO840 is ideal for discrete manufacturing and process control applications. For example, in a packaging line, its 16 outputs can control solenoid valves and motor starters. The current limiting and over-temperature protection prevent damage during short circuits or overloads, reducing unplanned downtime. In a water treatment plant, the two isolated groups allow separate control of different process sections, enhancing safety and reliability. The module's ability to set outputs to a predetermined state upon error detection (OSP function) is critical for fail-safe operations.
Installation & Setup Guidance
Mount the DO840 on a DIN rail within an S800 I/O system. Ensure proper grounding according to Class I requirements (earth protected). Connect field wiring to the compatible MTU (e.g., TU810V1) using a maximum cable length of 600 meters (656 yards). The module supports redundant or single applications, so configure the system accordingly. Use the keying code CE to ensure correct module placement. For vertical mounting in compact MTUs, note the maximum ambient temperature is 40 °C (104 °F).
Maintenance & Reliability
The DO840 features robust diagnostics including Module Error, Module Warning, and Channel error indicators. Regular inspection of the front LEDs can quickly identify faults. The module operates in temperatures from 0 to +55 °C (+32 to +131 °F) and stores from -40 to +70 °C (-40 to +158 °F). Its IP20 protection class suits clean indoor environments. The corrosion protection meets ISA-S71.04: G3, ensuring reliability in harsh conditions. Periodic cleaning of the enclosure and checking connections will extend service life.
Compatibility & Integration
The DO840 integrates seamlessly with ABB S800 I/O systems. It is compatible with MTUs including TU810, TU812, TU814, TU830, TU833, TU842, TU843, and TU852. The module communicates via the Modulebus, requiring +5 V and +24 V external power. It supports redundant configurations for high-availability systems. The module does not support HART or SOE, but its advanced diagnostics compensate for these features in many applications.
Buying Guide & Purchasing Advice
Before purchasing the ABB DO840 (article number 3BSE020838R1), verify your system's compatibility with the S800 series and required MTU. Ensure your power supply can deliver the necessary currents: 130 mA on +5 V Modulebus and 200 mA on +24 V external. The module weighs 0.15 kg (0.33 lbs) and measures 45 mm wide, 102 mm deep (111 mm with connector), and 119 mm high. SpareTechPLC offers this module with reliable availability and support. Contact us to confirm lifecycle status and stock before ordering.
Frequently Asked Questions
Q: What is the maximum output current per channel on the DO840?
A: The maximum continuous output current per channel is 0.5 A.
Q: How are the outputs grouped on the DO840?
A: The 16 outputs are divided into two isolated groups of eight channels, each with its own voltage supervision input.
Q: Does the DO840 support redundant configurations?
A: Yes, the module supports redundant or single applications.
Q: What certifications does the DO840 hold?
A: It has CE mark, electrical safety per EN 61010-1 and UL 61010-1, hazardous location approvals (C1 Div 2, C1 Zone 2, ATEX Zone 2), and marine certification DNV.
Q: What is the operating temperature range for the DO840?
A: The operating temperature is 0 to +55 °C (+32 to +131 °F), with approvals issued for +5 to +55 °C.
