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TK856

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The ABB TK856 is a 1-meter prefabricated RCU control link cable designed for reliable communication between the PM891 controller and ABB AC 800M or 800xA systems.
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Technical specifications for TK856

  • Manufacturer:
    ABB
  • Part Number:
    TK856
  • Product Family:
    ABB Advant OCS and Advant-800xA
  • Product Type:
    Prefabricated Cable
  • Rated Voltage:
    ≤ 30V DC
  • Application:
    RCU Control Link with PM891
  • RoHS Status:
    No declaration needed
  • WEEE Scope:
    Not in scope
  • SCIP (SVHC):
    No SVHC present
  • Connector Type:
    Pre-fitted (factory terminated)
  • Weight:
    0.09 kg
  • Estimated shipping dimensions:
    0.7x0.7x100 cm
  • Tariff Code:
    8544421100
  • Country of origin:
    Sweden
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Monitoring & Control Safety & Compliance Applications

Features:

  • Prefabricated Design for Error-Free Installation
  • Optimized for PM891 RCU Control Links
  • Environmentally Compliant with Global Trade Readiness
The ABB TK856 comes factory-terminated, eliminating the need for on-site soldering or crimping. This prefabricated construction reduces installation errors, speeds up cabinet assembly, and ensures consistent electrical performance across every unit.

Specifically engineered for use with the ABB PM891 controller, the ABB TK856 delivers dedicated RCU control link connectivity. Unlike general-purpose cables, it is verified for signal integrity under the electrical conditions found in AC 800M and 800xA systems, supporting deterministic control loop operation.

The ABB TK856 contains no SVHC substances under EU SCIP regulations and is outside WEEE scope, simplifying end-of-life management. Its HS Code 85444210 is internationally recognized, enabling fast customs clearance for global shipments.

The TK856 ABB Prefabricated RCU Control Link Cablet may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
ABB TK856 Prefabricated RCU Control Link Cablet Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
ABB TK856 Prefabricated RCU Control Link Cablet

General

  • Manufacturer ABB
  • Model TK856
  • Condition New Original ready stock
  • Product Family TK851,TK850,TK855
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Deterministic Signal Transmission – The ABB TK856 ensures repeatable timing for RCU control links, which is critical for sequence-of-events recording and interlock logic in process automation.
  • Passive Link – No Configuration Overhead – As a passive cable, the ABB TK856 introduces no latency, addressing, or firmware dependencies, making it transparent to system diagnostics.
  • Physical Layer Integrity Check – System diagnostics on the PM891 can verify the presence of the ABB TK856 by monitoring control link status; an open circuit indicates cable disconnection.
  • Compact Cabinet Integration – With a 7mm diameter and 0.09kg weight, the ABB TK856 supports high-density control cabinet layouts where space and weight are constrained.
  • No SVHC Under EU SCIP – The ABB TK856 contains no Substances of Very High Concern, allowing its use in regulated industrial facilities and simplifying compliance reporting for system integrators.
  • WEEE Exempt – The ABB TK856 falls outside the scope of the Waste Electrical and Electronic Equipment Directive, reducing end-of-life disposal obligations in EU member states.
  • RoHS Status – No Declaration Needed – While not formally RoHS declared, the ABB TK856 meets typical industry expectations for restricted substance levels in automation cabling.
  • Internationally Recognized HS Code – Classified under 85444210, the ABB TK856 is eligible for streamlined customs processing in most global markets, reducing supply chain delays.
  • AC 800M Controller-to-RCU Connectivity – The ABB TK856 links the PM891 controller to remote control units in distributed control systems, supporting auxiliary I/O and status monitoring.
  • 800xA System Cabinet Wiring – Used for internal cabinet wiring between controllers and termination units like the ABB TU860, reducing loose cabling and improving system organization.
  • Control System Retrofit Projects – Ideal for replacing aged or damaged RCU link cables in existing ABB AC 800M or 800xA installations without modifying system architecture.
  • Low-Voltage Control Signal Transmission – Suited for 30V DC control loops where shielded prefabricated cabling is required for noise immunity over short distances (≤1m).
Description
The ABB TK856 is a dedicated RCU control link cable manufactured as a prefabricated solution for ABB’s AC 800M and 800xA DCS environments. Engineered for use with the PM891 controller, this 1-meter cable establishes a physical control link between the controller and remote control units, ensuring deterministic signal transmission for critical process automation tasks. Its pre-terminated design eliminates field wiring errors, reducing installation time and improving system reliability.

In typical system configurations, the ABB TK856 works in conjunction with the ABB TU860 termination unit to form a complete control loop. The cable transmits low-voltage control signals under 30V DC, making it suitable for auxiliary and monitoring circuits within safety and non-safety applications. Its compact 7mm x 7mm profile allows easy routing within crowded control cabinets, while the 0.09kg net weight minimizes mechanical stress on connected interfaces.

For maintenance and system upgrades, the ABB TK856 offers a straightforward replacement pathway. The cable is RoHS exempt and contains no SVHC substances, supporting environmental compliance targets in regulated markets like the EU. It is classified globally as an insulated electric conductor fitted with connectors, simplifying international logistics for automation suppliers and system integrators.

Alternative Names
3BSE057021R1 TK856 3BSE057021R1 TK856 3BSEO57O21R1 TK856 3BSE05702IRI TK851 TK850 TK855
Technical notes
When integrating the ABB TK856 into an AC 800M-based control system, ensure that the cable is paired with a compatible termination unit such as the ABB TU860 to maintain signal integrity. The ABB TK856 should not be used for high-speed data links; it is optimized for RCU control link applications with voltage ratings not exceeding 30V DC.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Can the ABB TK856 be used for high-speed communication?
No. The ABB TK856 is intended for low-voltage control link applications (≤30V DC) and is not rated for high-speed data or fieldbus communication like PROFIBUS or Ethernet/IP.
Does the ABB TK856 require any special configuration after installation?
No. The ABB TK856 is a passive prefabricated cable. Once physically connected between the PM891 and the RCU or termination unit such as the ABB TU860, no software configuration or addressing is required.
Is the ABB TK856 compliant with EU environmental regulations?
Yes. The ABB TK856 contains no SVHC substances under the EU SCIP regulation and is not within the scope of WEEE. While RoHS status is marked as “no declaration needed,” it meets typical material compliance requirements for industrial automation exports.
What should I check if the ABB TK856 fails to establish a control link?
Verify that the cable is correctly seated in the PM891’s RCU port and that the connected termination unit (e.g., ABB TU860) is powered and functional. Because the ABB TK856 has no active electronics, failure is almost always mechanical or related to the connected modules.

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