TU891 3BSC840157R1 ABB Module Termination Unit
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Product’s description
The ABB TU891 (part number 3BSC840157R1) is a compact Module Termination Unit (MTU) used with the ABB S800 I/O system, commonly found in industrial
automation and distributed control systems. It acts as a passive termination interface that connects field wiring,
power, and communication buses to ABB I/O modules.
FAQ
Q1. What is a Module Termination Unit (MTU)?
A Module Termination Unit is a passive interface module that provides terminal points for connecting field wiring (signals and power) to modular I/O cards in an automation system. It also
passes communication signals (ModuleBus) to the attached I/O and to subsequent MTUs.
Q2. What does the TU891 specifically do?
The TU891 MTU connects field devices (via terminal blocks) to the I/O modules, distributes the ModuleBus, and ensures electrical continuity and correct addressing within
the S800 I/O system. It’s a key connecting component that does not process signals itself — it simply routes and terminates them.
Q3. What systems does it work with?
It’s built for the ABB S800 I/O architecture, a modular I/O platform used in ABB industrial control and distributed systems such as 800xA,
and pairs with a variety of analog and digital I/O modules (e.g., AI890, DI890).
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