Product Overview

The ABB TK851 (Product ID: 3BSC950192R1) functions as a specialized CEX-bus (Communication Extension Bus) termination cable within the AC800M controller architecture. This 0.7-meter prefabricated cable provides the necessary electrical impedance matching for the system's extension bus. Specifically, any configuration utilizing the TK850V007 connection requires the TK851 to act as the terminal reference point. This ensures signal reflection suppression and maintains high-speed data integrity between the primary controller and its expanded communication modules. We provide this unit as 100% Brand New and original, ensuring your control network operates without data loss or bus errors.

Technical Specifications

Engineering Advantages

The TK851 3BSC950192R1 solves critical communication stability issues inherent in high-speed industrial bus extensions through a precise termination design.

• Signal Reflection Suppression: The TK851 provides the specific resistive load required to terminate the CEX-bus. This prevents signal echoes that cause data corruption, which is vital when extending the bus via the TK850V007 link.

• Optimized Dimensional Profile: With a height of only 6 mm and a width of 13 mm, this cable fits into the narrow routing channels of standard industrial control racks. This low-profile design prevents mechanical interference with adjacent I/O modules.

• Factory-Terminated Reliability: As a prefabricated cable, the TK851 eliminates the need for manual on-site soldering or crimping. Factory-molded connectors ensure a gas-tight seal and a low-resistance path, protecting the link from oxidation in humid or corrosive environments.

• Essential System Symmetry: Using the TK851 ensures that the AC800M controller correctly identifies the end of the physical bus segment. This allows the system firmware to stabilize timing parameters for all modules connected to the CEX-bus.

FAQs

• Why does my system require the TK851 when using a TK850V007 cable?

  The TK850V007 extends the CEX-bus to another rack or module. Without the TK851 acting as a terminator at the end of this extension, the bus remains "open," leading to signal degradation and potential controller "Bus Off" faults.

• Can I use a standard 0.7m Ethernet cable instead of the TK851?

  No. The TK851 3BSC950192R1 contains specific internal termination logic and connector pinouts designed exclusively for the Woodward/ABB CEX-bus electrical standard. Using non-specified cabling will likely damage the communication ports.

• Is this a Brand New original ABB part?

  Yes. We supply the TK851 3BSC950192R1 in its original factory state. Reliability is a mechanical necessity for bus terminators; therefore, we provide only 100% Brand New units to ensure long-term system uptime.

• What mounting precautions should I take?

  Ensure the connectors seat fully into the bus port. Because of the 0.7m length, avoid tight bends (less than a 50mm radius) to prevent internal stress on the high-speed data pairs and the termination circuitry.