FANUC A20B-2901-0581 PMC-NB CPU control module. The A20B-2901-0581 runs with Fanuc 16A, 18A, 16B, 18B, 16C, 18C controls. A20B-2901-0581 provides features in order to run the 16 / 18 motherboard with PMC ladder. A20B29010581 pcb is available today, 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!