A20B-3300-0632 Fanuc PCB Board A20B33000632 A2OB-33OO-O632

A20B-3300-0632 | FANUC A20B-3300 Series CPU Module — 063x Processor Card / CNC Control Platform / Plug-In Module

A20B-3300 — The CPU Module Series

The A20B-3300 series is FANUC's comprehensive family of plug-in CPU modules — the processor cards that provide the central processing capability in FANUC CNC main boards. Confirmed through this session, the series spans an extensive range of processor generations and CNC platforms:

486-class modules (029x range):

• A20B-3300-0291: 486 processor, 16MB — Series 15i/16i/18i/21i (i-A generation)
• A20B-3300-0292: 486DX2, 32MB — Series 15i/16i and robots
• A20B-3300-0293: 486, 16MB — FANUC CNC platforms

Standard Pentium modules (031x range):

• A20B-3300-0311: Pentium, 16MB — Series 16i-B/18i-B
• A20B-3300-0312: Pentium, 16MB — Series 21i-B/210i-SB
• A20B-3300-0313: Pentium, 32MB SDRAM — Series 0i-C

Pentium MMX modules (060x range):

• A20B-3300-0600: Pentium MMX, 16MB — Series 16i-B/18i-B
• A20B-3300-0602: Pentium MMX, 16MB — Series 21i-B
• A20B-3300-0603: Pentium MMX, 32MB — Series 21i-B

High-memory and advanced modules:

• A20B-3300-0471: 128MB DRAM — Series 16i-B/18i-B/21i-B (B3 generation)
• A20B-3300-0475: A3 type, 128MB — Higher-spec platforms
• A20B-3300-0551: GUI module, 128MB — Graphical interface processor

The A20B-3300-0632 at the 063x position extends the module family — in the range immediately beyond the confirmed Pentium MMX modules (060x), indicating an advanced or extended-capability processor module for a specific FANUC CNC or automation platform.

Key Product Information

CPU Module Architecture — Common Features Across the A20B-3300 Family

All A20B-3300 modules share the plug-in architecture:

Board-to-board connection: The CPU module plugs into a defined socket on the CNC main board. All power, data bus, address bus, and control signals transfer through this connector interface.

Modular replaceability: The processor and its on-board DRAM are replaced as one unit. Main board, FROM, and SRAM modules are undisturbed during CPU module replacement.

Non-destructive data replacement: Replacing a CPU module leaves all stored CNC data intact — parameters in SRAM, system software in FROM, programmes in SRAM are unaffected.

Application Scenarios

CNC processor fault: A FANUC CNC system develops CPU-level faults — boot failures, processing errors, or platform-specific alarms pointing to the processor module. The A20B-3300-0632 is identified from its installed board label. Replacement restores processing capability.

Platform upgrade: A FANUC CNC system is upgraded to a higher-capability CPU module. The A20B-3300-0632 provides enhanced processing for the specific platform it serves.

FAQ

Q1: How do I confirm A20B-3300-0632 is the correct module for my FANUC CNC?

Read the part number from the installed module's label. If it reads A20B-3300-0632, this is the confirmed replacement. Cross-reference with the applicable FANUC CNC maintenance manual's spare parts table to confirm the module's exact function and processor specification for the host CNC model.

Q2: What processor does A20B-3300-0632 use?

The A20B-3300-063x position — immediately beyond the confirmed Pentium MMX 060x range — suggests an advanced processor architecture. Whether it is Pentium MMX with extended memory, a RISC processor variant, or a later-generation Intel processor is confirmed from the specific module's label and the applicable FANUC hardware documentation.

Q3: Does replacing A20B-3300-0632 affect CNC parameters or programmes?

No. CNC parameters and programmes reside in SRAM and FROM modules separate from the CPU module. Replacing A20B-3300-0632 does not affect stored data. The CNC resumes normal operation using existing parameters and software after fitting the replacement.

Q4: Can A20B-3300-0632 substitute for modules in the 060x Pentium MMX range?

Whether A20B-3300-0632 is interchangeable with 060x modules depends on whether the processor specification and connector interface are compatible. Different A20B-3300 variants serve platform-specific configurations — confirm compatibility from the applicable maintenance documentation before substituting.