ABB TK851 3BSC950192R1 CEX-Bus Terminator

Technical Overview

The TK851 (3BSC950192R1) is a critical CEX-Bus (Communication Extension Bus) terminator designed for the ABB AC 800M controller series. While often categorized under extension accessories, the TK851 serves as the end-of-line resistor required to maintain signal integrity. Whenever a CEX-Bus is extended using a cable (such as the TK850), the TK851 must be installed at the final module to prevent signal reflections and ensure stable high-speed communication between the CPU and its interface modules.

Detailed Technical Specifications

• Manufacturer: ABB

• Article Number: 3BSC950192R1

• Model Identification: TK851

• Product Type: CEX-Bus Terminator (End-of-Line)

• Weight: 20g (Ultra-lightweight, compact design)

• Country of Origin: USA

• Compatibility: ABB AC 800M Controller CEX-Bus

• Installation: Plug-in termination for the last module in a CEX-Bus chain

• Function: Impedance matching and signal stabilization

Key Features

• Signal Integrity: Eliminates "electrical echoes" or reflections that can occur at the end of a high-speed parallel bus.

• Compact Footprint: Designed to fit directly into the CEX-Bus port of the final communication module (CI8xx series) without requiring additional cabinet space.

• Essential for Expansion: A mandatory component for any configuration where the CEX-Bus is extended beyond the primary controller rail.

• Easy Installation: Passive component that requires no software configuration; simply plug and secure to complete the bus circuit.