FANUC A16B-3200-0030 is a digital I/O PCB A for compatible FANUC Series 21-TB CNC control configurations. FANUC hardware documentation specifies 96 digital inputs and 64 digital outputs for the 9-inch configuration.

This board connects CNC/PMC control logic with machine-side signals. It is not the servo amplifier or main CPU board; the Series 21-TB main board is identified separately as A16B-3200-0020.

A16B-3200-0030 Product Information

96-Input / 64-Output Machine Interface

The A16B-3200-0030 transfers machine status signals—such as switches and sensors—to the CNC/PMC and sends programmed output commands to machine devices through the configured electrical interface. Actual signal assignments, external relays and machine functions are determined by the machine-tool builder and PMC ladder.

Exact-Model and Replacement Checks

Match the complete A16B-3200-0030 number and PCB revision. Do not confuse it with A16B-3200-0031, which has 48 inputs and 32 outputs, or A16B-3200-0035, the 96/64 version for a 7.2-inch configuration. FANUC documentation pairs A16B-3200-0030 with A16B-2203-0040 as a compatible board, but connector layout, control unit, back panel, wiring and PMC configuration must still be confirmed.

Testing and Installation Notes

REACO CNC checks the model marking, PCB condition, connectors, board power, input/output circuits and system operation as applicable. Before replacement, back up CNC parameters and PMC data, label every connector and isolate machine power. Installation should be completed by qualified CNC personnel using anti-static protection.

Related resources: FANUC CNC and robot parts and FANUC CNC board repair service.