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ABB 3BSE022460R1 TU846

1. Product Introduction

ABB TU846 (3BSE022460R1) is a Module Termination Unit (MTU) used in the ABB S800 I/O system. It is designed for redundant configuration of CI840/CI840A field communication interfaces and redundant I/O modules in ABB Ability™ System 800xA and related control systems.

The TU846 is a passive connection and termination unit that provides the mechanical mounting, power distribution, communication connections, and redundancy interface between the controller communication network and S800 I/O modules.

2. Basic Information

3. Main Functions

Redundant Communication Interface Support

The TU846 supports two CI840/CI840A communication interface modules, enabling redundant communication paths for high-availability process control applications.

Redundant I/O Configuration

It is specifically designed for systems requiring redundant S800 I/O modules, improving system availability in critical industrial processes.

ModuleBus Connection

The unit provides connections for:

• Two electrical ModuleBuses
• Two CI840/CI840A modules
• ModuleBus Optical Port connection via TB842/TB846 accessories

Mechanical Keying Protection

Four mechanical keys (six positions each) provide configuration protection, preventing incorrect module insertion. This allows up to 36 different key combinations.

4. Technical Parameters

5. Features and Benefits

• Supports fault-tolerant redundant I/O architectures
• Compatible with ABB System 800xA control platforms
• Provides secure DIN rail mounting and grounding
• Reduces downtime through redundant communication paths
• Supports industrial environments with certified safety compliance
• Compact design for control cabinet installation

6. Application Fields

ABB TU846 is commonly used in:

• Oil & gas production facilities
• Chemical and petrochemical plants
• Power generation systems
• Water and wastewater treatment
• Mining and metals processing
• Large-scale process automation systems

Typical applications include systems where continuous operation and high availability are required.

7. Installation Notes

• TU846 cannot be replaced while power is applied (no hot swap capability).
• Adequate clearance is required on the left side for removal.
• Correct mechanical key configuration must be selected before installing I/O modules.
• Should be installed according to ABB S800 I/O system engineering guidelines.

8. Related ABB Components

9. Conclusion

The ABB TU846 3BSE022460R1 is a high-reliability redundant S800 I/O Module Termination Unit designed for ABB System 800xA automation environments. Its support for dual CI840/CI840A interfaces and redundant I/O makes it suitable for critical process industries requiring high availability, stable communication, and reliable field signal integration.