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ABB 3BSE021445R1 TU844

ABB 3BSE021445R1 (TU844) is a Redundant Module Termination Unit (MTU) used in the ABB S800 I/O system for ABB System 800xA / Freelance control systems. It provides the terminal interface between field wiring and redundant I/O modules.

1. Basic Information

2. Compatible I/O Modules

The TU844 is designed for use with:

• ABB S800 I/O modules:
  • AI845
  • AI880
  • AI880A
  • DP840

3. Technical Parameters

4. Main Features

• Redundant I/O capability for high-availability automation applications.
• Provides field wiring termination and power distribution for S800 I/O modules.
• Supports two ModuleBuses, distributing communication between I/O modules and adjacent MTUs.
• Mechanical keying prevents installation of incompatible I/O modules.
• DIN rail mounting with grounding latch mechanism.

5. Structure and Connections

The TU844 consists mainly of:

• Terminal block assembly for field wiring
• Redundant module interface connectors
• ModuleBus distribution connections
• Mechanical coding keys
• DIN rail mounting and grounding mechanism
• Optional shunt stick interfaces for signal configuration

6. Application Fields

Typical applications include:

• Power generation plants
• Oil & gas facilities
• Chemical and process industries
• Water treatment systems
• Large industrial automation installations

It is commonly used where continuous operation and redundant control I/O availability are required.

7. Related Accessories

Common accessories include:

• TY801K01 shunt sticks (used with AI845 / AI880A applications)
• TY804K01 shunt sticks (used with DP840 applications)
• TY805K01 shunt sticks (current-limited transmitter applications)

8. Summary

The ABB TU844 (3BSE021445R1) is a redundant 8-channel, 50 V Module Termination Unit for ABB S800 I/O systems. It is mainly used with redundant analog input and pulse counter modules, providing reliable field termination, signal conditioning support, and redundant communication paths in critical industrial control systems.