Fanuc PCB Backup Unit for 16i/ 18i/ 21i A20B-2100-0820

A20B-2100-0820 is a Printed Circuit Board (PCB) – Servo/Control interface board used in CNC systems manufactured by FANUC.

📌 Description

• Part Number: A20B-2100-0820

• Category: Control / interface PCB

• Series: A20B-2100 board family

• Application: Used inside the CNC control unit for communication and signal processing between control modules.

⚙️ Main Function

This board typically performs functions such as:

• Processing control signals between the CNC main CPU and peripheral modules

• Supporting servo interface communication

• Managing data exchange between internal boards of the CNC control system

🧩 Typical Installation

The A20B-2100 series boards are installed in the CNC control rack and connected with:

• Main CPU boards

• I/O interface boards

• Servo control modules

These boards are commonly found in CNC controls like:

• FANUC 16i

• FANUC 18i

• FANUC 21i

🧠 Summary

A20B-2100-0820 = Control/servo interface PCB used inside FANUC CNC control systems to manage communication and signal processing between the main control unit and peripheral modules.

If you want, I can also help you with a quick reference table of FANUC board prefixes (A02B, A08B, A13B, A20B) so you can identify the type of part just by looking at the number.