Digital guide
You are here:
FANUC A20B-2001-006506A
Product Name: FANUC Series 0-C Master PCB / Main CPU Motherboard
Product Introduction: The FANUC A20B-2001-006506A is the core processing motherboard for FANUC Series 0-C and 0-D CNC control systems. It hosts the central processing architecture, memory interfaces, and axis control loops, serving as the central intelligence hub for vintage machine tool controls.
Detailed content
Technical Specifications:
|
Parameter
|
Value
|
|---|---|
|
Manufacturer
|
FANUC
|
|
Part Number
|
A20B-2001-0065 (including /06A revision variant)
|
|
Compatible Series
|
FANUC Series 0-C, 0-D (0-MC, 0-TC, 0-MD, etc.)
|
|
Board Type
|
Master PCB / Main CPU Motherboard
|
|
Processor
|
32-Bit High-Speed CPU (Intel 486DX2)
|
|
Mounting Style
|
Full-Size Rack / Chassis Backplane Mount
|
|
Cooling Method
|
Natural Convection / Enclosure Airflow
|
|
Operating Temperature
|
0°C to 45°C
|
|
Axis Support
|
Up to 8 axes (2/3/4/6/8 configurations)
|
|
Memory Support
|
PMC-L or independent PMC-M PCB; 40/40, 80/56, or 104/72 I/O
|
Functional Features:
- 32-bit split architecture distributing processing across memory, axes, I/O via backplane
- Supports serial servo interface for AC spindle and Alpha spindle drives
- Executes NC programs, ladder logic (PMC), and servo control algorithms
- Backplane-based communication with graphics, I/O, and axis control boards
Structural Characteristics:
- High-density multi-layer surface-mount PCB construction
- Gold-plated edge connector for backplane interface
- Dedicated slots for sub-CPU, memory, and graphics cards
Installation Requirements:
- Install in clean, dry CNC cabinet with adequate ventilation
- Maintain ambient temperature 0–55°C
- Keep fans and filters in good operating condition
- Seat board evenly in backplane; secure with screws and brackets
Usage Notes:
- Always wear grounded ESD wrist strap; handle PCB by edges only
- Back up CNC parameters, PMC, and program data before removal
- Verify SRAM backup battery voltage before and after replacement
- Never force board into rack slots; align carefully to avoid pin damage
- Confirm exact revision (/06A) compatibility with existing system
