Fanuc Backpanel (3 slots) for 16i/ 18i/ 21i A20B-2003-0230

A20B-2003-0230 is a CNC control PCB (Printed Circuit Board) used in systems manufactured by FANUC.

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📌 Basic Information

• Part Number: A20B-2003-0230

• Type: Printed Circuit Board (PCB)

• Category: I/O Interface Board

• Used In: FANUC CNC controllers (commonly Series 0 / 0-Mate / early 0i systems)

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⚙️ Main Functions

The A20B-2003-0230 board is typically used as an I/O interface board that connects the CNC controller to machine signals.

Typical roles include:

• Processing input signals from machine switches and sensors

• Sending output signals to relays, solenoids, and machine devices

• Communication between the CNC control and machine electrical system

• Supporting PMC (Programmable Machine Control) operations

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🧩 Installation Location

This board is normally installed:

• Inside the CNC control cabinet

• On the control rack or I/O base unit

• Connected to other CNC boards through the FANUC backplane

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🔎 Typical Machine Signals Connected

The board may handle signals such as:

• Limit switches

• Tool change signals

• Hydraulic / pneumatic controls

• Machine door signals

• Coolant and auxiliary equipment

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✅ Simple explanation:
A20B-2003-0230 = FANUC CNC I/O interface PCB used to connect the CNC controller with machine electrical signals and devices. 🔧