Yokogawa Primary Power Distribution Unit A2FU2 CENTUM VP Base Plate (for FCU) constitutes Field Control Unit (FCU) with each function module such as Power Supply Module, Processor Module, Bus Interface Module and I/O Module. In addition, Base Plate (for FCU) selects an external interface by combining with HKU Interface Unit (A2FU1) or Primary Power Distribution Unit (A2FU2).