A20B-3300-0479 Fanuc PCB Board A20B33000479 A2OB-33OO-O479
A20B-3300-0479 | FANUC D3 CPU Module — 128MB DRAM / Plug-In Processor Card / CNC and Industrial Automation
D3 — The High-Memory CPU Generation
The A20B-3300-0479 belongs to the family of 128MB DRAM CPU modules within the A20B-3300 series — the high-memory generation that succeeded the Pentium-class modules with 16 or 32MB DRAM.
The "D3" CPU designation identifies the processor platform and capability level of this module. Within the A20B-3300 series, the 047x range covers high-performance modules with 128MB DRAM — a significant step up from the earlier generation's 16 or 32MB:
| Board | CPU Designation | Memory | Notes |
|---|---|---|---|
| A20B-3300-0471 | B3 | 128MB | Series 16i-B/18i-B/21i-B |
| A20B-3300-0475 | A3 | 128MB | Higher-spec platforms |
| A20B-3300-0479 | D3 | 128MB | Industrial CNC |
All three modules provide 128MB DRAM — the D3 designation identifies the specific processor architecture, interface characteristics, and platform compatibility that distinguish 0479 from its 047x siblings.
Key Specifications
| Parameter | Value |
|---|---|
| CPU Designation | D3 |
| Memory | 128MB DRAM |
| Weight | 0.1kg |
| Type | Plug-in CPU module |
| Series | A20B-3300 |
| Warranty | 12–36 months depending on supplier |
Revision Specificity — Order Correctly
Industrial Automation Co specifically notes: "Due to potential revision specificity, it is crucial for customers to provide revision details when placing an order." This is a critical ordering note.
The A20B-3300-0479 exists in multiple revision variants. The installed revision affects compatibility with the host CNC's main board and software version. Before sourcing a replacement:
- Read the installed module's revision suffix from its label (e.g., /01A, /02B)
- Confirm this revision with the supplier
- Ensure the replacement carries a matching or compatible revision
Application Scenarios
CNC CPU module fault: A FANUC CNC develops CPU-level boot failures or processing errors. The A20B-3300-0479 D3 module is identified as the fault. After confirming the correct revision, replacement restores CNC processing.
CNC memory capacity upgrade: A FANUC CNC with an older Pentium-class CPU module (16 or 32MB) is upgraded to the A20B-3300-0479 D3 module with 128MB DRAM to support additional software options or advanced contouring modes.
FAQ
Q1: What is the "D3" CPU designation in A20B-3300-0479?
"D3" identifies the processor platform and hardware generation of this module within the A20B-3300-047x family. Similar to "A3" (A20B-3300-0475) and "B3" (A20B-3300-0471), the D3 designation specifies which FANUC CNC hardware generation and main board architecture this module is matched to. Confirm the correct designation from the installed module's label.
Q2: Is A20B-3300-0479 a direct replacement for A20B-3300-0471 (B3) or A20B-3300-0475 (A3)?
All three are 128MB DRAM CPU modules in the 047x family, but different CPU designations (B3, A3, D3) indicate different platform compatibility. They are not interchangeable without confirming that the specific module type matches the CNC main board's socket and software requirements. Always match the installed module's designation.
Q3: Does replacing A20B-3300-0479 affect CNC parameters or programmes?
No. CNC parameters and programmes reside in separate SRAM and FROM modules. Replacing the CPU module does not affect these stored values. After fitting the replacement, the CNC boots from FROM and reads parameters from SRAM.
Q4: Why is the weight only 0.1kg?
The A20B-3300-0479 is a compact plug-in module — its 0.1kg weight reflects a small PCB with processor and DRAM chips in surface-mount packaging. The module's compact form factor allows it to plug horizontally onto the CNC main board without requiring a separate card slot.
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