TU840 3BSE020846R1 Overview

The ABB TERMINATION UNIT TU840 3BSE020846R1 is a termination unit for redundant I/O configurations, connecting two optical modems (TB840/TB840A) to the ModuleBus and featuring mechanical keying and cluster address setting.

Features and benefits

Redundant Support: Designed for redundant I/O configuration with Optical ModuleBus Modems TB840/TB840A.

Address Configuration: Features a rotary switch for setting the cluster address (1-7).

Mechanical Keying: Uses four keys (36 combinations) to prevent insertion of incorrect module types.

Robust Bus Connection: Provides a double ModuleBus connection for reliable communication.

Easy Installation: DIN-rail mountable with a latching device for secure locking and grounding.

Power Flexibility: Operates on 24V DC input and supports both vertical and horizontal mounting.

FAQ

Q1: What is the primary function of the TU840?

A1: It is a termination unit for connecting two TB840/TB840A optical modems in a redundant I/O configuration.

Q2: How is the cluster address configured?

A2: A rotary switch is used to set the cluster address from 1 to 7.

Q3: How does it prevent incorrect module insertion?

A3: It uses four mechanical keys, offering 36 different configurations to block incompatible modules.

Q4: What is its power requirement?

A4: It operates on a 24V DC power supply (19.2-30V range).

Q5: How is it physically installed?

A5: It is DIN-rail mounted with a latching device for secure locking and grounding.