The BC810K02 complete kit is a standardized supporting component for segmental redundancy and capacity expansion of the CEX bus in the ABB AC800M control system. The full set includes all hardware required to build dual interconnection redundant links without extra accessory purchases, and it is applicable to various high-reliability process control projects. A single BC810 interconnection unit consists of a TP857 base and a power logic board. The base carries CEX bus connection terminals and a 24V external power supply interface, achieves reliable earthing on DIN rails via a metal housing, and integrates a power fault protection circuit. The logic main board integrates a 3.3V voltage conversion unit, bus driver chips, interconnection cable interfaces and fault diagnosis logic to ensure stable forwarding of data across segments.

The core value of this kit lies in bus partition isolation. It splits the originally integrated CEX backplane into independent, non-interfering communication segments. Communication faults within a single segment only affect local modules without causing overall system communication outages, perfectly meeting the expansion demands of multi-protocol redundant communication interfaces such as DP and Modbus. In a primary-standby dual CPU redundant system, the BC810 interconnection architecture allows independent disassembly and replacement of the CPU base on one side while maintaining normal data transmission on the other CEX bus throughout the process. No shutdown or load reduction is required, greatly shortening equipment maintenance time.

The device adopts an independent external power supply design, free from power intake limitations of the rack backplane and reducing power load pressure on the CPU backplane. The whole unit supports hot swapping under power, with indicator lights displaying three real-time statuses: power ready, bus online and line alarm for intuitive and efficient fault localization. Its hardware is compatible with all series PM controllers of AC800M. Multiple BC810K02 kits can be deployed in a single system to realize centralized arrangement of large-scale communication modules. Compliant with SIL standards for constructing high-reliability systems, it strengthens the fault tolerance of the DCS system at the underlying bus architecture level and satisfies stringent requirements for communication continuity and maintainability in industrial scenarios with 24/7 non-stop operation.