Description

ABB TU842 3BSE020850R1 Redundant Module Termination Unit (MTU)

Product Overview

The ABB TU842 3BSE020850R1 is a 16-channel redundant module termination unit (MTU) designed for ABB’s S800 I/O system, serving as a critical interface between field devices and I/O modules in industrial automation. As a passive signal distribution hub, it enables reliable connection and management of analog/digital signals while distributing the module bus to downstream MTUs and I/O modules. The TU842 is optimized for high-availability applications and offers enhanced isolation and redundancy support compared to standard MTUs, making it suitable for industries requiring robust signal integrity in harsh environments .

Key attributes include a rugged polycarbonate housing (IP20-rated), supporting DIN rail or panel mounting, and compatibility with a wide range of S800 I/O modules (e.g., AI 843, AO 845, DI 840). The TU842 plays a pivotal role in distributed control systems (DCS) like ABB’s Advant 800xA, ensuring seamless integration of sensors, actuators, and process equipment across industries such as oil & gas, power generation, and chemical processing .

Technical Specifications

Parameter	Value
Product Model	ABB TU842 3BSE020850R1
Manufacturer	ABB
Product Type	Redundant Module Termination Unit (MTU) for S800 I/O system
Function	Signal distribution hub for field devices and I/O modules
Rated Voltage	50 V AC/DC
Maximum Current	3 A per I/O channel; 10 A per process connection
Operating Temperature	0°C to +55°C (horizontal mounting); 0°C to +40°C (vertical mounting)
Storage Temperature	-40°C to +70°C
Humidity	5–95% non-condensing
Physical Dimensions	64 mm (depth) × 186.5 mm (height) × 124 mm (width)
Weight	0.6 kg (net)
Mounting Type	DIN rail or panel-mounted
Channels	16 channels (2×8 signal terminals)
Isolation Voltage	500 V AC (dielectric test voltage)
Protection Class	IP20
Compatibility	S800 I/O modules (AI 843, AO 845, DI 840, DO 840, etc.)

Key Features and Advantages

Redundant Signal Management:
The TU842 supports dual redundant I/O configurations, ensuring high system availability in critical applications (e.g., offshore platforms or power plants). It features two individually isolated process voltage groups (each with a 6.3 A fuse), allowing independent power distribution for redundant systems .
High-Density Signal Distribution:
- 16 Channels: Manages up to 16 field devices in a compact form factor, reducing cabinet space requirements.
- Mechanical Keying: 6-position keys enable 36 configurations, preventing incorrect insertion of I/O modules and ensuring compatibility with specific signal types (e.g., analog vs. digital) .
Enhanced Environmental Resilience:
- Temperature Range: Operates reliably from 0°C to +55°C (horizontal) or 0°C to +40°C (vertical), withstanding extreme conditions in offshore platforms or power plants .
- Certifications: CE, UL, CSA, ATEX (Zone 2), and marine certifications (ABS, BV, DNV-GL) ensure compliance with global safety standards .
Tool-Free Installation:
Spring terminals enable fast, secure wiring without tools, reducing downtime during maintenance. The lightweight design (0.6 kg) and compact form factor simplify installation in space-constrained cabinets .
Multi-Industry Compatibility:
Supports seamless integration with ABB’s Advant 800xa DCS, AC500 PLCs, and third-party systems via Profibus DP or Ethernet/IP. It is widely used in oil & gas, water treatment, and manufacturing sectors .

Application Areas

The TU842 excels in industries requiring reliable high-channel density signal management and modular I/O connectivity:

Oil & Gas: Manages wellhead pressure sensors, valve actuators, and flow meters in offshore platforms and refineries.
Power Generation: Integrates turbine control systems, boiler sensors, and grid stabilization equipment.
Chemical Processing: Controls reactor temperature transmitters, distillation column valves, and safety interlocks.
Water Treatment: Manages pump stations, pH sensors, and anaerobic digesters in wastewater treatment plants.
Manufacturing: Connects robotic arm sensors, conveyor belt actuators, and quality control equipment in automotive production lines .

Comparison with Related Models

Model	Channels	Rated Voltage	Isolation Voltage	Key Applications
TU842	16	50 V AC/DC	500 V AC (test)	High-availability, redundant systems
TU811	8	250 V AC/DC	2000 V AC	High-voltage industrial environments
TU830V1	16	50 V AC/DC	50 V AC	General-purpose I/O distribution

The TU842’s redundant design and dual isolated process voltage groups distinguish it from the TU810/TU830 series, making it suitable for applications where system reliability is critical .

Installation and Maintenance

Installation Steps:

Mounting: Secure the TU842 on a DIN rail in a dry, well-ventilated area.
Wiring: Connect field wiring (24 V DC power and signal cables) using the spring terminals.
Key Configuration: Adjust mechanical keys to match the connected I/O modules (e.g., AI 843 vs. DI 840) .

Maintenance Recommendations:

Periodic Inspections: Check for loose connections or corrosion, especially in humid or corrosive environments.
Firmware Updates: Ensure compatibility with the latest DCS software versions via ABB’s Automation Builder tool.
Diagnostic Monitoring: Use ABB’s diagnostic tools to monitor signal integrity and module health .

Product Availability

Warranty: 1 year against defects in materials and workmanship. Some distributors offer extended warranties (e.g., 2 years) .
Inventory: Limited stock available globally, with expedited delivery options (e.g., 3–5 days for Xiamen, China-based orders) .

HS:7326909000

Contact info

WhatsApp: +86 18030182217
Email: sandydcsplc@gmail.com
Phone: +86 18030182217
Wechat: +86 18030182217
Website: www.xiongbaparts.com