Fanuc A16B-2201-0470 Series 21 I/O Board. Normally this input output board supports the machine interface and interacts with the ladder to make sure that all the switching throughout the machine is working according to the ladder. Running the FS-21M or 21T config in which this I/O interfaces between the NC and the MC.
This board was designed to run with any spindle and servo interfaces including digital, serial and rarely analogue configurations. A16B22010470 input output PCB is seldom available, either as exchange or on an outright basis stock dependent with full testing and repair services are available also. Warranty is 180 days on repair or exchange!