Fanuc A16B-2200 Family CNC Control Board, Revision 10B — Series 16 / 18 / 21 Generation, Board Only (Function Not Documented)

What this part is:
A Fanuc printed circuit board, part number A16B-2200-0800, revision /10B. It belongs to the A16B-2200 board family, which Fanuc used across the Series 16, 18 and 21 CNC generations.

Correcting the source data — we have withdrawn an unsupported claim:
Our previous listing described this as an “I/O Control Board.” We could not corroborate that from Fanuc documentation or from any source we would rely on, so we have removed it rather than repeat it. One reseller index lists A16B-2200-0800 as a “serial 5/6 axis” board, which would make it an axis-control rather than an I/O card — but that is a single third-tier listing with no supporting document, and one uncorroborated claim is not better than the other. We are therefore not stating a function for this board.

That is a deliberate choice. On a Fanuc control, buying a board on a wrong functional description is expensive: it goes in the wrong slot, or it does not go in at all, and the machine stays down while a second board is ordered. An honest gap serves you better than a confident guess. Our previous copy also began with a stray digit — “3The Fanuc…” — a feed artefact, now removed.

What the part number does tell you:
A16B — Fanuc’s PCB prefix for older-generation control boards and drive units. The other prefixes in use are A17B and A20B.2200 — the board family. The A16B-2200 series is one of Fanuc’s most functionally diverse: it spans CNC main control, PMC, option expansion and robot axis boards. Documented members include A16B-2200-0900 (Series 16-A main CPU), A16B-2200-0910 (Series 16 Option 1 graphics), A16B-2200-0341 (PMC-M I/O Link ROM master) and A16B-2200-0854 (8-axis robot axis board for R-J). Family membership alone therefore tells you very little about function — which is exactly why we are not inferring one.0800 — this specific board./10B — the revision. On Fanuc boards a revision change can mean a different memory capacity or a different feature set, not just a manufacturing tweak, so record it and match it.

How to identify the board you need:
Fanuc PCBs carry a twelve-digit part number beginning with A, usually printed in yellow ink on the green board. If the board you can see is marked with an A320 or A350 number, turn it over — the A16B/A17B/A20B number is on the other side. Boards that mount to a master PCB or backplane often do not carry the full number in yellow at all; those have a yellow plastic frame with a mounting screw top and bottom, and a white barcode sticker on the top edge carrying the complete twelve-digit number.

Match the full number and the revision. A single digit’s difference in a Fanuc part number can mean a different memory capacity, and the machine’s software parameters are written against the hardware that was there.

What is not included:
Board only. Not included: the backplane or master PCB this mounts to, the rack and card cage, any daughter cards or memory modules, all cabling and mating connectors, the power supply unit, and any Fanuc system software, PMC ladder or machine data.

Quantity and configuration:
Three units in stock, new old stock, sold individually. On a discontinued Fanuc control board that is real depth — enough to cover a machine plus two shelf spares, or spares across three machines running the same control. Fanuc boards from this generation are not being made and the surplus pool only shrinks.

Interchange guidance:
Search forms include A16B-2200-0800, A16B22000800, A16B 2200 0800, A16B-2200-0800/10B, A16B-2200-0800-10B and A16B2200-0800. Related and adjacent A16B-2200 boards, listed for orientation rather than as substitutes: A16B-2200-0900 (Series 16-A main CPU), A16B-2200-0910 through -0919 (Series 16 option and graphics boards), A16B-2200-0341 (PMC-M I/O Link ROM master), A16B-2200-0854 (R-J robot axis board).

The Series 16 / 18 / 21 controls are legacy but still widely in production service, and Fanuc Corporation remains in business. Board-level repair and exchange for A16B boards is available from the legacy CNC trade — MRO Electric, FanucWorld and Radwell all handle this family. If you can identify this board’s function from your machine’s parts list or maintenance manual, tell us and we will publish it here with the source credited. We would rather correct this page than leave the gap.