Fanuc A20B-3300-0280 Video Card Used In good condition A20B33000280 A2OB-33OO-O28O

FANUC A20B-3300-0280 | 10.4-Inch Color LCD Graphic Control Module with Ethernet — Series 16i-B / 18i-B, Japan Origin

Part Number: A20B-3300-0280

Manufacturer: FANUC Corporation (Japan)

Product Type: Graphic Control Module with Embedded Ethernet (PC Card)

Board Series: A20B-3300

Compatible Systems: FANUC Series 16i-B, 18i-B, 21i-B, 0i-B

Display: 10.4-inch Color LCD

Connectivity: Embedded Ethernet

Weight: 0.1 kg

Overview

The A20B-3300-0280 is a 10.4-inch color LCD graphic control module with integrated Ethernet for FANUC Series 16i-B, 18i-B, 21i-B, and 0i-B CNC systems. It is the display driver PCB that plugs directly onto the back of the operator panel or into the main CPU board of the CNC controller and performs two functions simultaneously: it drives the 10.4-inch color display and provides the controller's embedded Ethernet communication interface.

Having display control and Ethernet on the same module is a defining feature of the B-series generation. Earlier FANUC CNC generations required separate hardware for network connectivity.

The A20B-3300-0280 integrates both. The Ethernet port the machine uses for DNC data transfer, remote monitoring, FOCAS communication, or network-based parameter management is provided by this board.

The graphical display that the operator watches is also driven by this board.

The A20B-3300-0280 pairs with graphic software series 60V6 and embedded Ethernet control software series 656A.

These software packages must be present in the CNC's FROM for the board's full capabilities to be active.

The hardware provides the physical interface; the software enables the specific functions.

Key Specifications

Two Functions, One Module

The graphic controller and the Ethernet interface are separate circuits on the A20B-3300-0280, but they share a single physical module.

This matters from a maintenance perspective. A fault on this board can manifest as a display problem, a network problem, or both — depending on which circuit has been affected.

The display section generates the video signal for the 10.4-inch color panel. It handles the full screen output: axis position readouts, program screens, parameter pages, alarm displays, and tool path graphics.

The Ethernet section provides the physical layer and protocol support for the controller's network interface. FOCAS/FOCAS2 communication, DNC program transfer, remote parameter access, and data logging all depend on this Ethernet interface being functional.

When diagnosing a fault on a machine with this module, it is worth testing both functions independently.

Ethernet loss with a working display, or display loss with Ethernet intact, helps narrow the fault to a specific circuit section within the board. Both failing together is more consistent with a power supply problem or a complete board failure.

Embedded Ethernet — What It Enables

The embedded Ethernet on this module connects the CNC controller to a factory network. This connection supports a range of operational functions that matter in modern manufacturing environments.

DNC — Direct Numerical Control — allows part programs too large for the CNC's internal memory to stream directly from a network server as the machine runs. The program does not need to be stored in the CNC's SRAM; it arrives over the network as the machine needs it.

The A20B-3300-0280's Ethernet interface is what makes this possible.

FOCAS communication allows external software on a PC or server to read CNC data in real time — spindle load, axis positions, alarm states, cycle times, program names. This data feeds production monitoring systems, MES platforms, and maintenance scheduling tools.

Without the Ethernet interface on this board, those external systems have no path to CNC data.

Remote parameter backup and restore — uploading and downloading parameters over the network rather than via memory card — is also supported through this interface.

B-Series Context — 16i-B / 18i-B Compatibility

The "-B" suffix on the Series 16i and 18i controllers identifies the Model B generation — the generation that introduced embedded Ethernet and the enhanced graphic controller hardware represented by the A20B-3300-0280 family.

The -0280 is the 10.4-inch color variant. The same family includes the -0281 (8.4-inch color), -0282 (9.5-inch monochrome), and -0283 (7.2-inch monochrome) for other display configurations.

The A20B-3300-0280 is not compatible with earlier i-series models (the Model A generation) even when those models use 10.4-inch color displays.

The graphic module family changed between generations. Always confirm the controller's specific model designation — 16i-B or 18i-B, not just 16i or 18i — before sourcing a replacement.

FAQ

Q1: The machine lost Ethernet connectivity but the display still works normally. Could the A20B-3300-0280 be the fault?

Ethernet loss with intact display function indicates the Ethernet circuit on the board has failed while the graphic circuit remains functional.

This is a valid failure mode for this board. Before replacing the board, check the Ethernet cable and the network switch port — a cable fault or switch port failure produces the same symptom. If the cable and switch are confirmed good, the board's Ethernet circuit is the next suspect.

Q2: The display is blank after replacing the A20B-3300-0280 with a refurbished unit. The controller appears to boot. What should be checked?

Confirm the replacement module is fully seated in its socket — partial seating breaks the display signal path entirely. Also check the display panel's video cable connection at the module end.

A blank display immediately after a board swap is almost always a physical connection issue rather than a board fault.

Re-seat the module firmly and reconnect the video cable, then power cycle.

Q3: The machine's Ethernet worked before. After changing the IP address parameters, Ethernet stopped responding. Is the board faulty?

This is almost certainly a parameter configuration issue rather than a board fault. An incorrect IP address, subnet mask, or gateway parameter prevents network communication even though the Ethernet hardware is fully functional.

Verify the network parameter settings in the CNC's Ethernet configuration screen and confirm they are consistent with the factory network segment the machine is connected to. Restore the previous settings if a backup exists.

Q4: Can the A20B-3300-0280 be used in a Series 21i-B controller?

Yes. The A20B-3300-0280 is listed in the Series 21i-B hardware configuration as a compatible graphic and Ethernet module when Ethernet functionality is required.

The Series 21i-B uses the same A20B-3300-0280/0281/0282/0283 family as the 16i-B and 18i-B for its Ethernet-capable display configurations.

Q5: The graphic software and Ethernet software must be loaded — does replacing this board require a software reload?

The graphic software and Ethernet software are stored in the CNC's FROM memory, not on this board.

Replacing the A20B-3300-0280 does not affect FROM contents. The software that was present before the swap remains available after the swap. 

No software reload is required for the replacement module to function, provided the FROM contains the correct graphic and Ethernet software series for this board type.