Product Details
Description
The DO840 module provides 16 current-sourcing 24 V DC outputs for actuators such as solenoids, relays, and lamps. It supports redundant operation for uninterrupted control and includes diagnostics for short- and open-circuit detection, ensuring reliability in critical oil, gas, and power applications.
Specifications
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Manufacturer: ABB
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Country of Origin: Sweden
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Model Number: DO840
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Order Number: 3BSE020838R1
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Product Series: S800 I/O
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Number of Channels: 16 (Sourcing)
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Nominal Voltage: 24 V DC
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Maximum Output Current: 0.5 A per channel
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Approximate Weight: 0.28 kg
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Redundancy: Supported (Dual module configuration)
Features
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Redundancy Capability: Designed for high-availability architectures to prevent single points of failure in control loops.
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Comprehensive Diagnostics: Real-time monitoring of field wiring integrity, including short-circuit and open-circuit fault detection.
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Galvanic Isolation: Group-wise isolation protects the internal system logic from field-side electrical interference and surges.
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Enhanced Maintenance: Supports hot-swappable replacement, allowing technicians to swap modules without interrupting the process or disconnecting power.
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Front Panel Indicators: Integrated LEDs provide immediate status updates for each channel, power health, and fault conditions.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.