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ABB 3BSE042560R1 TU849

1. Product Overview

The ABB TU849 (3BSE042560R1) is a Module Termination Unit (MTU) designed for the ABB S800 I/O system. It is used with the TB840/TB840A Optical ModuleBus Modem in redundant configurations and provides the electrical interface, power connections, and termination functions required for reliable I/O communication.

The TU849 is a passive termination unit that supports 1+1 TB840/TB840A modem configurations, with dual power supply connections and a single electrical ModuleBus connection.

2. Technical Parameters

3. Product Features

Dual Power Supply Connection

• Provides separate power connections for each TB840/TB840A modem.
• Improves system availability by supporting redundant power arrangements.

ModuleBus Interface

• Provides a single electrical ModuleBus connection between the modem interface and the S800 I/O system.
• Supports reliable communication between field I/O modules and controllers.

Mechanical Keying Protection

• Equipped with configurable mechanical keys.
• Prevents incorrect module insertion and improves installation safety.
• Supports multiple key combinations for configuration flexibility.

DIN Rail Installation

• Designed for standard DIN rail mounting.
• Includes a mechanical latch for secure mounting and grounding.

4. Structural Composition

The ABB TU849 mainly consists of:

• MTU base assembly
  • Provides mechanical mounting and electrical termination.
• TB840/TB840A modem interfaces
  • Supports two Optical ModuleBus Modems in a redundant arrangement.
• Power supply terminals
  • Dual 24 V DC power input connections.
• ModuleBus termination components
  • Includes required termination accessories such as TB807 ModuleBus terminator.
• Rotary cluster address switch
  • Used for cluster address configuration (1–7).

5. Application Fields

The TU849 is commonly used in industrial automation environments, including:

• Process control systems
• Power generation plants
• Oil & gas facilities
• Chemical and petrochemical industries
• Water treatment plants
• Large manufacturing automation systems

Typical application:

• Connecting ABB S800 I/O stations to System 800xA controllers.
• Supporting redundant optical ModuleBus communication networks.
• Providing stable field I/O communication infrastructure.

6. Advantages

• High reliability for continuous industrial operation
• Supports redundant TB840/TB840A communication architecture
• Compact DIN rail installation
• Compatible with ABB System 800xA automation platforms
• Designed for harsh industrial environments with CE and industrial certifications

7. Conclusion

The ABB TU849 (3BSE042560R1) is a key interface component in ABB’s S800 I/O and System 800xA automation platforms. As an MTU for redundant TB840/TB840A Optical ModuleBus Modems, it provides secure power distribution, ModuleBus termination, and reliable communication connectivity. It is widely applied in high-availability industrial control systems where stable and redundant I/O communication is required.