Mitsubishi Electric PLC Accessories, xtension Equipment Accessory, MELSEC-F Series, Application: For connecting a terminal block type expansion device to the FX3UC sequencer, and for additional power when the expansion power supply (5 V DC) is not enough, Type: Expansion Power Supply Unit, Other specifications: Use this unit when there is not enough internal power available to be supplied to the expansion blocks and special blocks/units used with the FX3UC basic unit. Can additionally be used as a conversion adapter when connecting FX0N/FX2N I/O expansion blocks or special blocks/units for FX0N/FX2N to FX3UC.