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ABB 3BSE020846R1 TU840

The ABB 3BSE020846R1 TU840 is a Module Termination Unit (MTU) used in the ABB S800 I/O system. It is designed for redundant configuration of the TB840/TB840A Optical ModuleBus Modem, providing the interface between the optical ModuleBus communication module and redundant I/O configurations.

Basic Information

Main Functions

The TU840 provides:

• Connection for two TB840/TB840A Optical ModuleBus Modems
• Support for redundant I/O architecture
• Dual electrical ModuleBus connection
• Power supply connection
• Cluster address configuration through rotary switch
• Mechanical keying to prevent incorrect module installation
• DIN rail locking and grounding mechanism

Technical Features

Communication

• Bus type: ModuleBus
• Line redundancy: Supported
• Module redundancy: Supported
• Compatible modules: TB840 / TB840A Optical ModuleBus Modem

Electrical Data

• Input voltage: 24 V DC
• Acceptable range: 19.2–30 V DC
• Rated insulation voltage: 50 V
• Dielectric test voltage: 500 V AC
• Typical power dissipation: 2 W

Mechanical Data

Structural Composition

The TU840 consists mainly of:

1. MTU base assembly
   • Provides electrical termination and mechanical support.
2. TB840/TB840A interfaces
   • Allows installation of redundant optical ModuleBus modems.
3. Power connector
   • Supplies 24 V DC system power.
4. ModuleBus connections
   • Provides redundant communication paths.
5. Rotary address switch
   • Used for cluster address settings (1–7).
6. Mechanical coding keys
   • Six-position keys allow up to 36 configuration combinations and prevent incorrect module insertion.

Application Fields

ABB TU840 modules are commonly used in:

• Oil & gas processing plants
• Power generation facilities
• Chemical and petrochemical plants
• Water treatment systems
• Industrial process automation
• ABB System 800xA control systems

Typical applications include redundant remote I/O installations where high availability is required.

Compatible Components

Commonly associated ABB components:

• TB840 / TB840A — Optical ModuleBus Modem
• S800 I/O modules
• ABB AC 800M controllers
• System 800xA automation platform

Key Benefits

• Supports high-availability redundant I/O systems
• Improves system reliability through module redundancy
• Prevents incorrect hardware installation through coding
• Compact DIN rail installation
• Designed for industrial environments with ABB automation platforms

Summary

The ABB TU840 (3BSE020846R1) is a critical S800 I/O termination component used for redundant TB840/TB840A ModuleBus modem configurations. It provides reliable communication, power distribution, and mechanical integration for ABB high-availability process control systems.