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GE Genius IC660BBA104 115 VAC Current Source Analog I/O blocks are used to interface a GE PLC controller to devices that provide or accept 4mA to 20mA analog signals. An IC660BBA104 Current Source Analog I/O block has four 4 to 20mA current inputs. Each input provides a 24 volt current loop power supply and is isolated from all other circuits within the block. The two output channels on the IC660BBA104 provide power and control of two 4-to-20mA current loops.