4256A10G01 is an original Westinghouse core control board (3MSX12 subassembly) for Emerson Ovation distributed control system, serving as the underlying logic processing motherboard of DCS control racks. It adopts multi-layer high-temperature FR-4 industrial PCB and full electromagnetic shielding layout to suppress strong electromagnetic interference in severe industrial environments such as thermal power plants and petrochemical plants. Every circuit board passes 72-hour high-low temperature cycle aging, full logic function verification and bus communication calibration before delivery. It adopts standard rack backplane plug-in design with hot-swap support, and integrates multi-stage overvoltage, overcurrent, reverse connection and surge protection circuits. This motherboard undertakes underlying signal scheduling, logic operation and cross-module data interaction of the entire control rack, greatly enhancing the overall stability of the DCS system and reducing equipment maintenance downtime.