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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-8200-0843 |
The A20B-8200-0843 is the A3U variant of the main PCB for FANUC's 0i-Model D CNC — the board at the centre of the 0i-D control system that defines its processing capability, PMC specification, feature set, and hardware revision. In FANUC's modular CNC architecture, the main PCB is the platform board: it determines which peripheral boards, memory modules, and communication options can be combined in that controller configuration.
The A3U designation identifies a specific hardware revision and feature build within the 0i-D main board family. FANUC's 0i-Model D platform covers several CNC variants — 0i-TD (turning), 0i-MD (machining centre), and 0i-Mate-D — and each may use a specific main board variant matched to its axis count, PMC specification, and available option slots. The 40B0
PMC and 0043B hardware ID associated with this board help confirm the specific configuration when cross-referencing during replacement planning.
USB capability is noted in service listings as a feature on this board — relevant for program transfer, data backup, and field firmware updates in 0i-D systems.
| Parameter | Value |
|---|---|
| Part Number | A20B-8200-0843 |
| Designation | 0i-D Main PCB A3U |
| Series | A20B-8200 |
| Platform | FANUC 0i-Model D (0i-TD, 0i-MD) |
| PMC | 40B0 |
| Hardware ID | 0043B |
| USB | Yes |
| Origin | Japan |
Unlike passive interface boards or backplane PCBs, the main PCB is closely tied to the installed firmware. Service channels for A20B-8200-0843 note that firmware or series confirmation may be needed before fitting a replacement — a main board carrying different firmware than the installed CNC's configured version can produce axis parameter mismatches, PMC incompatibilities, or feature set differences that require additional setup before the machine runs correctly.
Before ordering:
The main PCB itself does not store CNC parameters — those reside in the SRAM/FROM memory modules. A like-for-like main board replacement does not require parameter re-entry if the memory modules are retained and undisturbed. Firmware loading at the BOOT screen may be required if the replacement board carries a different software version
Q1: What is the A20B-8200-0843 and what does A3U mean?
It is the main PCB for FANUC's 0i-Model D CNC — the core control board for 0i-TD (turning) and 0i-MD (machining centre) systems. A3U identifies the specific hardware revision and feature build of this main board variant within the 0i-D family. The designation matters because different A3x variants serve different 0i-D configurations and are not interchangeable.
Q2: Does replacing the main PCB require re-entering CNC parameters?
Not for a like-for-like replacement if the SRAM and FROM memory modules are retained. CNC parameters, tool offsets, and programs are stored in the memory modules, not in the main PCB. However, if the replacement board carries a different firmware version from the installed control, firmware loading via the BOOT screen may be needed before normal operation. Confirm firmware compatibility before installation.
Q3: What are the 40B0 PMC and 0043B identifiers?
40B0 identifies the PMC (Programmable Machine Controller) specification built into this main board — the PMC ladder execution capacity, step count, and I/O address range. 0043B is the hardware ID that distinguishes this specific board build. These details help cross-reference the correct replacement when multiple A20B-8200 variants exist and the board label is difficult to read.
Q4: Can the A20B-8200-0843 work in a 0i-MF (newer 0i generation) system?
The A20B-8200-0843 is designed for the 0i-D platform. The 0i-MF is a later hardware generation that typically uses a different main board series. Fitting a 0i-D main PCB into a 0i-MF system requires firmware and hardware compatibility confirmation — this is not a straightforward substitution. Confirm with a FANUC service resource before attempting cross-generation fitting.
Q5: Where is the A20B-8200-0843 sourced?
Through the FANUC 0i-D aftermarket — CNC main board specialists and legacy FANUC CNC parts dealers. Confirm the A3U designation and request information on the firmware version loaded on the replacement board before purchase. Core exchange programmes may be available from some suppliers, allowing credit against the returned failed board.
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