A16B-2200-0775 Fanuc PCB Board A16B22000775 AI6B-22OO-O775

FANUC A16B-2200-0775 | 32-Bit Remote Buffer DNC 2 PCB — Series 0 Zero C CNC / A16B-2200 

DNC 2 on the Zero C CNC — Direct Numerical Control in the Machine

The A16B-2200-0775 is the 32-bit remote buffer DNC 2 PCB for FANUC's Series 0 Zero C control — the board that enables Direct Numerical Control (DNC) operation, where part programmes are transmitted from a host computer to the CNC while the machine runs, rather than stored entirely within the CNC's own memory.

In the Zero C CNC architecture, DNC 2 is a specific communication option that provides a buffered serial interface to a host DNC computer or CAM system. The 32-bit remote buffer on this PCB holds incoming programme data as it streams from the host, allowing the CNC to execute the programme from the buffer in real time. The "remote buffer" function keeps the

CNC running even when the host transmission has brief pauses — the buffer absorbs timing variations between host output and CNC consumption. Without a functioning DNC board, the machine cannot run in DNC mode and must work entirely from programmes stored in the CNC's local memory.

FANUC's Zero C (Series 0-C) was a foundational CNC platform spanning CNC lathes (0-TC, 0-TTC), machining centres (0-MC), EDM and grinding machines. Many Zero C installations remain in active production service, maintaining demand for this board through the aftermarket.

Key Specifications

DNC Mode — Programme Streaming in Production

On a machine operating in DNC mode, the part programme does not need to fit within the CNC's limited onboard memory — it streams from a connected host computer through the DNC interface as the CNC executes it. This is especially relevant for programmes generated by CAM systems for complex 3D contour work, where programme size can exceed the CNC's local storage capacity many times over.

If the A16B-2200-0775 fails, DNC operation ceases entirely. The machine can still run programmes stored in its own memory, but any workflow dependent on live programme streaming from a host computer is interrupted until the board is replaced.

FAQ

Q1: What FANUC CNC series uses the A16B-2200-0775?

The A16B-2200-0775 is confirmed for FANUC Series 0 Zero C CNC controls. The Zero C family covers 0-MC (machining centre), 0-TC (turning centre), 0-TTC (twin turret turning), 0-MD, and 0-TD variants. All use the same A16B-2200 series board family. Confirm the board's position in the specific machine's CNC hardware configuration before ordering.

Q2: What is DNC 2 and how does it differ from DNC 1?

DNC (Direct Numerical Control) allows part programmes to stream from a host computer to the CNC in real time. DNC 2 is a specific FANUC implementation with a 32-bit remote buffer that holds incoming data ahead of execution — the buffer smooths transmission timing variations between the host and the CNC. DNC 1 is an earlier, simpler interface without this buffering architecture. The specific DNC type in a Zero C installation is determined by the board fitted and the CNC option configuration.

Q3: If the A16B-2200-0775 fails, can the machine still operate?

Yes, for programmes stored in the CNC's local memory. DNC mode only requires the board when the machine is executing a programme streamed from a host computer. Internal programmes stored in the CNC's programme memory are unaffected by the DNC board's status. DNC-dependent workflows (large programmes, CAM-direct machining) cannot continue without the board.

Q4: Can the A16B-2200-0775 be repaired?

Board-level repair is available through FANUC Zero C CNC specialists. Common failure points include the serial communication ICs, buffer memory, and connector contacts. A FANUC A16B-2200 repair centre can diagnose and repair the board and verify DNC function through a CNC test before returning.

Q5: Where is the A16B-2200-0775 sourced?

Through the FANUC Zero C CNC aftermarket — FANUC board dealers, repair services, and tested surplus suppliers. The Zero C platform has a large global installed base, sustaining aftermarket availability. Confirm A16B-2200-0775 specifically from the installed board's label before ordering.