The Omron C200HW-BI051 PLC Backplane Expansion Unit provides 5 I/O slots for extending modular Programmable Logic Controller architectures used in C200H control systems. It supports installation of compatible control modules while providing the internal connections required for signal transfer between components within the rack architecture. The unit operates with a 5 VDC supply and has a current consumption of 0.15 A. Its five-slot configuration provides additional module capacity for machine and factory automation systems that require a moderate expansion of the existing controller platform. The C200HW-BI051 supports modular C200HW expansion and belongs to the 5-slot PLC expansion rack range used across Omron machine control systems.