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      ABB TK856
      ABB TK856

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      1 m RCU control-link cable

      TK856

      Spare Part Number

      PN3BSE057021R1

      Product Information:

      ABB identifies TK856, article 3BSE057021R1, as a 1.0 m Redundant Control Unit control-link cable for PM891. It carries role-selection and CPU-identity assignment between the redundant processors. Use it only between the documented redundant PM891 units. Match TK856, article 3BSE057021R1, 1.0 m length, PM891 controller pair, cable routing and RCU control-link ports.


      Product image is representative; revision or series may vary. Contact us to request a specific version.
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        • PRODUCT OVERVIEW

          What is this product?

          ABB TK856 is documented as a 1 m RCU control-link cable for ABB AC 800M redundant PM891 controllers. ABB identifies TK856, article 3BSE057021R1, as a 1.0 m Redundant Control Unit control-link cable for PM891. It carries role-selection and CPU-identity assignment between the redundant processors. Match TK856, article 3BSE057021R1, 1.0 m length, PM891 controller pair, cable routing and RCU control-link ports.

          Official source

          ABB AC 800M controller hardware guide. Exact article, 1.0 m length, PM891 use and RCU control-link purpose.
        • APPLICATIONS

          Where it may be used

          Use it only between the documented redundant PM891 units. Record upper/lower CPU assignment, isolate as required by the maintenance procedure and route the cable without strain or tight bends. Verify both CPU identities, primary/backup roles, RCU diagnostics and controlled switchover after connection.

          Redundant CPU link

          Connects the documented control-link ports of the PM891 pair.

          Upper lower identity

          Supports the CPU role/identity relationship defined by ABB.

          One-metre routing

          Keeps the specified length free of tension, damage and excessive bend.

          Switchover proof

          Confirms redundancy diagnostics and controlled role transfer after service.
      Technical specifications for

      TK856

      0 TECHNICAL PARAMETERS
      • Manufacturer:
        ABB
      • Product Category:
        DCS Systems
      • Spare Part Number:
        3BSE057021R1
      • Cable Type:
        TK856 RCU control-link cable
      • Cable Length:
        1.0 m
      • Used With:
        Redundant PM891 controllers
      • Control Function:
        Role selection and CPU identity assignment
      • Endpoint Check:
        PM891 RCU control-link ports
      • Stock Availability:
        6
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      BUYER INFORMATION

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        New and current product sourced through the manufacturer or authorized supply channel when expressly confirmed in the quotation.

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      Alternative Names

      TK856 3BSE057021R1 3BSE057021R1 TK856

      Information

      Overview Manuals PM891 Cable Identity CPU Role Assignment Redundancy Test

      Features:

      • ABB identifies TK856, article 3BSE057021R1, as a 1.0 m Redundant Control Unit control-link cable for PM891. It carries role-selection and CPU-identity assignment between the redundant processors.
      • Match TK856, article 3BSE057021R1, 1.0 m length, PM891 controller pair, cable routing and RCU control-link ports.
      • Verify both CPU identities, primary/backup roles, RCU diagnostics and controlled switchover after connection.

      TK856 must be selected from the complete manufacturer identity and the receiving-system evidence. Use it only between the documented redundant PM891 units. Record upper/lower CPU assignment, isolate as required by the maintenance procedure and route the cable without strain or tight bends.

      Official source: ABB AC 800M controller hardware guide. Exact article, 1.0 m length, PM891 use and RCU control-link purpose.
      TK856 official technical documentation and related ABB resources.Important Notice: Confirm the complete article number and installed configuration before replacement. Each link opens in a new page.

      Use TK856 article 3BSE057021R1; TK855 data-link and TK857 cables have different roles.

      The control link participates in upper/lower identity and primary/backup coordination.

      Verify both processors, RCU alarms and controlled switchover after the cable is replaced.

      Technical notes

      TK856 must be controlled by its complete identity. Exact article, 1.0 m length, PM891 use and RCU control-link purpose. Record upper/lower CPU assignment, isolate as required by the maintenance procedure and route the cable without strain or tight bends. Verify both CPU identities, primary/backup roles, RCU diagnostics and controlled switchover after connection.

      RCU Control Function

      TK856 is not the RCU data-link cable. ABB assigns it to the PM891 control link, where it supports role selection and CPU identity assignment between the redundant processors.

      Online Link Verification

      After routing the 1 m cable between the correct ports, confirm upper/lower identities, primary/backup indication and a clear RCU diagnostic state. Perform only the switchover procedure allowed by the running-system maintenance plan.

      Customs & shipping dimensions / weight

      • Packed shipping dimensions
        Confirmed after final packing
        1.0 m cable length
      • Packed shipping weight
        Confirmed after final packing
        0.1 kg listed item weight
      • HS / customs code
        Preliminary HS heading 8544.42
        Confirm destination-country classification before shipment.
      • Country of origin
        Not officially confirmed
        Verify against the supplied item nameplate or certificate of origin.
      • Ships from
        Xiamen, Fujian, China
        Dispatch location is confirmed in the written quotation.
      • Customs documents
        Confirmed for the destination
        Available document scope is stated in the written quotation.
      PRODUCT & ORDER FAQS

      Questions buyers ask about TK856

      • How is the exact TK856 identified?

        ABB identifies TK856, article 3BSE057021R1, as a 1.0 m Redundant Control Unit control-link cable for PM891. It carries role-selection and CPU-identity assignment between the redundant processors. Use every printed article, suffix and revision together.

      • What must match before installing TK856?

        Match TK856, article 3BSE057021R1, 1.0 m length, PM891 controller pair, cable routing and RCU control-link ports.

      • What technical role does TK856 perform?

        Use it only between the documented redundant PM891 units.

      • Which preparation is required before replacing TK856?

        Record upper/lower CPU assignment, isolate as required by the maintenance procedure and route the cable without strain or tight bends.

      • How should TK856 be commissioned?

        Verify both CPU identities, primary/backup roles, RCU diagnostics and controlled switchover after connection.

      • Which source supports the listed TK856 information?

        ABB AC 800M controller hardware guide. Exact article, 1.0 m length, PM891 use and RCU control-link purpose.

      • Are unverified nearby-model specifications used for TK856?

        No. Values that cannot be tied to the complete TK856 identity are withheld rather than copied from a visually similar product.

      • What ordering evidence should be supplied for TK856?

        Provide the required quantity, clear nameplate photographs, the receiving equipment identity, installed revision and delivery destination so the exact supply scope can be confirmed.
      All FAQ
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            Availability and lifecycle status are confirmed for the exact TK856 article at quotation.

            Moore Automated verifies the supplied condition, included items and installed-system match against the complete manufacturer identity.

            The replacement must be commissioned with the checks listed in the technical sections.

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          Moore Disclaimer: Moore Automated's sales automation equipment and related solutions are intended for industrial automation and business operational efficiency improvement purposes only. Product information, technical parameters, and application cases are for reference only and do not constitute an absolute guarantee of performance for any specific industry, scenario, or final application. Actual equipment performance may vary depending on factors such as the usage environment, system integration method, and maintenance conditions. Users should confirm compatibility and safety based on professional technical assessments. Moore Automated assumes no liability for any direct or indirect losses caused by improper use, modification, or failure to operate according to specifications, to the extent permitted by law.

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