Overview

The ABB TU849 Termination Unit is engineered to provide robust connectivity and redundancy in distributed control systems. It supports dual power supply connections, redundant modem configurations, and secure electrical ModuleBus integration. Moreover, the TU849 is DIN‑rail mounted with a mechanical latch for easy installation and maintenance. In addition, its rotary switch allows cluster address settings from 1 to 7, enabling flexible system design. Therefore, it is widely adopted in ABB’s 800xA and AC 800M automation platforms where high availability and fault tolerance are essential.

Technical Data

Typical Applications

• Redundant communication setups: Ensures continuous operation in ABB S800 I/O networks.

• Process industries: Provides secure modem termination for chemical, oil & gas, and pharmaceutical plants.

• Power generation: Supports redundant communication in turbine and boiler control systems.

• Water treatment facilities: Enhances reliability in distributed control systems for pumps and mixers.

• Manufacturing automation: Used in high‑availability production lines requiring fault‑tolerant communication.

For instance, engineers often deploy the TU849 in redundant ModuleBus configurations to guarantee uninterrupted communication. In addition, its mechanical keys and rotary switch simplify configuration changes, while DIN‑rail mounting ensures quick installation.

FAQ

Q1: What is the primary function of the TU849?
A1: It serves as a passive termination unit for redundant TB840/TB840A optical modems.

Q2: How is redundancy achieved with the TU849?
A2: By supporting dual power supplies and two optical modems, ensuring continuous communication.

Q3: Can the TU849 be easily installed?
A3: Yes, it is DIN‑rail mounted with a mechanical latch for secure and simple installation.

Q4: How many cluster addresses can be set?
A4: The rotary switch allows settings from 1 to 7 for flexible system design.

Q5: What accessories are included with the TU849?
A5: It comes with one power supply connector and one TB807 ModuleBus terminator.