Description
📌 ** — Part Description**
FANUC A20B-3300-0392 is a servo controller module (axis control board) used in FANUC CNC control systems. It’s part of the A20B-3300 series of control boards that manage motion and servo tasks within a CNC controller — especially on i-Series controls such as 16i-B, 18i-B, and 21i-B.
🧠 What It Is
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Part Number: A20B-3300-0392
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Category: Servo Control PCB (Axis/Servo Module)
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Function: 4-axis servo control board — this board handles motion control for up to four servo axes via FANUC’s FSSB (Field Servo Serial Bus) interface.
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Series: FANUC A20B-3300 series PCB modules used in CNC systems.
📊 Function & Typical Use
This board plays a key role in the motion control subsystem of FANUC CNC controls:
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It interprets motion commands from the main CPU and generates servo position and velocity control instructions.
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Interfaces with servo drives and encoders through the FSSB interface to coordinate movement across multiple machine axes.
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Designed to be plugged onto the controller’s rack or backplane, alongside other boards (e.g., CPU board, display board, I/O boards).
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Common in FANUC 16i-B / 18i-B / 21i-B CNC control cabinets as a 4-axis motion control card.
🛠️ Key Features
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Axis Support: Up to 4 axes of motion control.
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FSSB Communication: Uses Field Servo Serial Bus — FANUC’s digital servo communication protocol.
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Industrial-grade PCB: Built for durable performance in CNC environments.
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Often available refurbished or new via industrial parts suppliers.