A20B-8100-0665 Fanuc 21i-B Ethernet 5VDC/24VDC Main CPU Board

Description

Fanuc A20B-8100-0665 is a high-performance main CPU printed circuit board measuring approximately 250 mm x 200 mm, designed for the 21i-B series CNC control systems. The multi-layer board integrates an Ethernet communication interface and PMC-SB7 logic processing capabilities to manage high-speed data exchange and machine sequence control. It features dedicated slots for CPU processors, servo cards, and surface-mount device modules including ROM and SRAM/DRAM components. The hardware architecture is built on a yellow backplane interface, utilizing high-density edge connectors for signal integrity and noise immunity within the control cabinet environment.

A20B-8100-0665 Specifications
Model Number: A20B-8100-0665
Brand: Fanuc
Category: Main CPU Control Board
Series: 21i-B (Model B)
Logic Type: PMC-SB7
Communication: Integrated Ethernet Port
System Compatibility: A02B-0285-Bxxx
Processor Compatibility: A20B-3300-031x
Input Voltage: 5 VDC / 24 VDC
Operating Temperature: 0 to 60 °C
Storage Temperature: -20 to 70 °C
Humidity: 10 to 90 % RH
Board Construction: Multi-layer FR-4
Interface: RJ45 Ethernet, Multi-pin Edge Connectors
Module Support: ROM, SRAM, DRAM, Servo Cards
Weight: 0.55 kg

A20B-8100-0665 Applications
Primary applications include integration into Fanuc 21i-MB and 21i-TB CNC control systems used for multi-axis milling and turning centers. Deployed within A02B-0285-Bxxx series control cabinets to coordinate communication between the central processor, servo drives, and peripheral I/O modules in automated production lines.