Brief Product Description

BC810K02, part number 3BSE031155R1, is a CEX‑bus interconnection unit kit designed for ABB AC 800M and System 800xA DCS platforms. This bus‑segmentation hardware splits the CEX‑bus communication expansion bus into independent segments, isolating faults to avoid total bus failure caused by a single faulty communication module. Optimized for redundant CPU configurations, it enables online CPU base‑plate replacement without interrupting CEX‑bus traffic. Hot‑swap capable and built for continuous operation, it improves communication reliability for high‑availability industrial control racks.

Product ID:3BSE031155R1

ABB model name :BC810K02

Directory Description :BC810K02 CEX-bus Interconnection Unit

Product net depth: 127.5mm

Product clear height: 185mm

Product net width: 59mm

Net weight of the product: 1.55kg

2 pcs BC810, Interconnection Unit

- 2 pcs TP857, Baseplate

- TK851, Interconnection Cable

- 2 pcs TB850, CEX-Bus Terminator

The BC810 can be used with PM857, PM861A, PM862, PM863, PM864A, PM865, PM866, PM866A, PM867 and PM891

Core Product Functions

• Segment CEX‑bus into independent sections to limit fault spread across communication modules
• Support fully redundant AC 800M CPU configurations with primary‑standby controller pairs
• Allow online replacement of CPU base‑plate without breaking existing CEX‑bus communication traffic
• Compatible with CI‑series communication interface modules mounted on CEX‑bus segments
• Hot‑swap capable for module replacement while control rack remains powered on
• Expand the maximum quantity of communication interface units supported per controller rack
• Hardware‑level bus isolation reduces system downtime caused by single communication card failure
• Front‑panel LED indicators for status monitoring and basic hardware fault diagnostics
• Full configuration support via ABB Control Builder M engineering software

Application Scenarios

• Power‑plant DCS control cabinets with redundant AC 800M controllers for boiler and turbine control
• Petrochemical, refinery and oil‑gas plant high‑availability process automation systems
• Chemical, pulp‑and‑paper and metallurgical industrial distributed control installations
• Water‑treatment and municipal utility SCADA systems requiring fault‑tolerant communication
• Retrofit and upgrade projects for legacy ABB 800xA / AC800M redundant control racks
• Spare replacement interconnection unit for maintenance of existing CEX‑bus control systems

FAQ (Frequently Asked Questions)

• Q: Partial CEX‑bus segment loses communication after module installation?
  A: Check module seating, interconnection cable TK851 connection, CEX‑bus terminator TB850 status and segment configuration parameters.
• Q: One faulty CI module brings down the whole CEX‑bus network?
  A: Confirm BC810K02 segmentation setup is correctly configured; verify physical bus‑segment division and termination installation.
• Q: Can BC810K02 be hot‑swapped while the control rack stays energised?
  A: Module hot‑swap is supported, yet replacement of BC810 itself will stop traffic on its connected CEX‑bus segment; plan maintenance accordingly.
• Q: Will this interconnection unit work with third‑party PLC or non‑AC800M hardware?
  A: It is dedicated for ABB AC 800M / 800xA CEX‑bus, cross‑platform compatibility is not supported.

• Q: Is 3BSE031155R1 available for brand‑new DCS construction projects?
  A: This legacy unit has reached end‑of‑life. Only surplus and refurbished spare‑part kits are offered for existing‑site maintenance work.

BC810K02 3BSE031155R1.pdf