ABB TU840 Module Termination Unit (MTU)

Description

Technical Specifications

Core Redundancy & Communication Specifications

• Product Type: S800 I/O Module Termination Unit (MTU)
• Order Code: 3BSE020846R1
• Primary Function: Supports 1+1 redundant TB840/TB840A Optical ModuleBus Modems
• ModuleBus Configuration: Dual redundant ModuleBus paths (electrical)
• Included Components: 1x Power Supply Connector; 2x TB807 ModuleBus Terminators
• I/O Module Support: Compatible with all standard S800 I/O modules (AI, AO, DI, DO, PI)
• Redundancy Type: Full communication and power redundancy for TB840/TB840A modems

Electrical & Power Specifications

• Power Input: 24 V DC nominal (19.2 V – 30 V DC)
• Power Distribution: Fused redundant 24 V DC power to connected I/O modules
• ModuleBus Power: Supplies 5 V DC / 1.5 A and 24 V DC / 1.5 A to I/O modules
• Insulation Rating: Rated insulation voltage 50 V; Dielectric test voltage 500 V AC
• Power Dissipation: Maximum 2.0 W
• Wire Compatibility: Solid: 0.2 – 2.5 mm²; Stranded: 0.2 – 2.5 mm² (24 – 12 AWG)
• Terminal Torque: Recommended 0.5 Nm

Mechanical & Physical Specifications

• Mounting: Standard DIN-rail mounting (EN 60715), vertical or horizontal orientation
• Protection Class: IP20 (EN 60529) for indoor control cabinet installation
• Net Weight: Approximately 0.45 kg (1.0 lbs)
• Dimensions: Compact form factor (depth: 47 mm) optimized for dense cabinet layouts
• Mechanical Keying: Prevents incorrect module insertion with 36 unique key combinations

Environmental & Compliance Specifications

• Operating Temperature: 0 °C to +55 °C
• Storage Temperature: -25 °C to +70 °C
• Humidity: 5% – 95% RH, non-condensing
• Pollution Degree: 2 (IEC 60664-1)
• Equipment Class: Class I (earth protected) per IEC 60536
• EMC Compliance: EN 61000-6-2 (immunity), EN 61000-6-4 (emission)
• Certifications: CE marking, cULus, ATEX Zone 2, IEC 61131-2 compliant

Key Features

Redundancy-Optimized Design

• Dual ModuleBus Support: Enables 1+1 redundant TB840/TB840A modems, eliminating single points of failure in optical ModuleBus communication.
• Redundant Power Distribution: Delivers fused, redundant 24 V DC power to I/O modules, ensuring continuous operation during power supply faults.
• Pre-Installed Terminators: Includes two TB807 ModuleBus terminators for immediate dual-bus termination, simplifying redundant setup.
• Seamless Failover: Supports fast, bumpless failover between primary and redundant communication paths, maintaining process continuity.

Robust Field & System Integration

• Universal I/O Compatibility: Fully interoperable with the entire S800 I/O module range, supporting analog, digital, and specialty I/O signals.
• Galvanic Isolation: Provides electrical isolation between field wiring, communication buses, and power circuits, preventing ground loops and signal interference.
• Mechanical Keying: Unique keying system ensures only compatible modules are installed, protecting against wiring errors and system damage.
• Hot-Swap Capability: Integrates with S800 I/O’s hot-swap functionality, allowing module replacement during operation without system shutdown.

Industrial-Grade Reliability

• Wide Environmental Tolerance: Operates reliably across 0 °C to +55 °C, suitable for harsh industrial environments.
• Vibration Resistance: Sturdy DIN-rail latching and construction withstand industrial vibration, ideal for heavy manufacturing and mobile applications.
• Fused Protection: Integrated power fusing safeguards against overcurrent conditions, protecting both the MTU and connected I/O modules.
• Long-Term Durability: Built with industrial-grade components for extended service life in 24/7 continuous operation.

Simplified Installation & Maintenance

• Tool-Free Setup: Pre-configured terminators and connectors reduce installation time and complexity for redundant systems.
• Clear Wiring Paths: Organized terminal layout simplifies field wiring and troubleshooting, minimizing commissioning time.
• Compact Footprint: Space-saving design maximizes control cabinet density, supporting large-scale I/O deployments.
• Diagnostic Compatibility: Works with S800 I/O diagnostic tools for real-time monitoring of redundancy status, power, and communication health.

Application Scenarios

Process Industries (High-Availability Critical)

• Oil & Gas Refineries & Pipelines: Supports redundant I/O for distillation columns, pipeline monitoring, and safety instrumented systems (SIS) where downtime is catastrophic.
• Petrochemical & Chemical Plants: Ensures uninterrupted control of reactors, separators, and hazardous material handling with dual communication paths.
• Pharmaceutical Manufacturing: Provides fault-tolerant I/O for batch processes, cleanroom automation, and regulatory-compliant production lines.
• Water & Wastewater Treatment: Delivers reliable connectivity for pump stations, filtration systems, and SCADA integration in municipal and industrial water facilities.

Power Generation & Utilities

• Thermal & Nuclear Power Plants: Integrates redundant I/O for boiler control, turbine management, and generator protection systems.
• Renewable Energy (Wind/Solar): Supports fault-tolerant I/O clusters for wind turbine arrays and solar farm inverters, ensuring grid stability.
• Electrical Substations: Enables redundant communication for protection relays, switchgear control, and power distribution automation.

Manufacturing & Heavy Industry

• Automotive Assembly: Provides high-reliability I/O for robotic welding, paint shops, and conveyor systems with zero-downtime requirements.
• Metal Processing & Mining: Operates in harsh, dusty environments for furnace control, rolling mills, and material handling equipment.
• Food & Beverage Packaging: Ensures continuous operation for high-speed packaging lines, filling machines, and quality control systems.

Infrastructure & Critical Facilities

• Data Centers: Supports redundant environmental monitoring, cooling systems, and UPS power management for 24/7 IT infrastructure.
• Airports & Transportation Hubs: Delivers fault-tolerant I/O for baggage handling, runway lighting, and terminal automation systems.
• Marine & Offshore: Operates on FPSOs and offshore platforms, providing redundant I/O for topside process systems in harsh marine conditions.

Chemical & Specialty Manufacturing

• Fertilizer & Industrial Gas Production: Ensures safe, continuous operation of high-pressure, high-temperature processes with redundant control.
• Pulp & Paper Mills: Supports redundant I/O for paper machine control, drying processes, and quality monitoring systems.