TU891 3BSC840157R1 Overview

The ABB S800 I/O Module TU891 3BSC840157R1 is a compact modular terminal unit for DIN-rail mounting, providing terminal connections and bus distribution for up to 8 intrinsically safe I/O modules.

Features and benefits

Specific Application: Designed for compact installations of intrinsically safe I/O modules.

Connection Hub: Provides 27 terminal connections for field signals and 24V process power.

Bus Distribution: Distributes the ModuleBus to the connected I/O module and the next MTU.

Safety Keying: Features mechanical keys to prevent the insertion of incorrect I/O modules.

Easy Installation: Simple DIN-rail mounting with a latching device.

Compatibility: Compatible with AI890, AI893, AI895, AO890, AO895, DI890, and DO890 modules.

FAQ

Q1: What is the primary function of the TU891?

A1: It is a compact modular terminal unit (MTU) that provides field signal and power connections for intrinsically safe I/O modules.

Q2: What I/O modules is it compatible with?

A2: It is designed for use with intrinsically safe modules like AI893, DO890, AO890, DI890, AI890, AI895, and AO895.

Q3: How does it prevent incorrect module installation?

A3: It uses specific mechanical keying that only mates with the correct IS I/O modules.

Q4: How is the module address assigned?

A4: It automatically generates the correct address for its connected I/O module and manages downstream addressing.

Q5: What is its power connection specification?

A5: It provides 27 gray terminals for field signals and 24V process power, with a maximum rating of 50V and 2A per channel.