Product Details
Description
The TU842 module termination unit supports redundant 24 V DC output modules like the DO840, ensuring continuous actuator control during faults or module replacement. It features shared field wiring, isolated power groups, and hot-swap capability, ideal for high-uptime, safety-critical applications in energy, water, and chemical industries.
Specifications
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Manufacturer: ABB
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Country of Origin: Estonia / Sweden
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Model Number: TU842
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Order Number: 3BSE020850R1
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Product Series: S800 I/O
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Mounting Type: Dual-slot for redundancy
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Rated Voltage: 24 V DC
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Maximum Current: 8 A per unit
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Process Connections: 16 channels (Group isolated)
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Approximate Weight: 0.55 kg
Features
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Redundancy Support: Dual-module mounting capability eliminates single points of failure for critical output loops.
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Seamless Field Wiring: Consolidates wiring for 16 channels into a single, organized terminal block for both primary and backup modules.
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Hot-Swap Performance: Internal circuitry allows for the extraction and insertion of I/O modules while the station remains under power.
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Mechanical Security: Includes individual mechanical keying for each slot to prevent the installation of incorrect module types.
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Enhanced Protection: Built-in fuse points and isolation barriers protect the ModuleBus from field-side electrical disturbances.
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
Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.
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.