Fanuc Basic Unit for 16i A02B-0281-B502

A02B-0281-B502 is a CNC control module used in controllers manufactured by FANUC.

📌 Description

• Part Number: A02B-0281-B502

• Type: Main CPU / CNC control board

• Series: FANUC 0i-series CNC controller

• Category: CNC main control module

⚙️ Function

This module acts as the central processing unit of the CNC system. It performs:

• NC program (G-code) processing

• Axis interpolation and motion control

• Communication with servo amplifiers and spindle drives

• PMC (Programmable Machine Control) ladder execution

• Management of machine I/O signals

🧩 Where It Is Installed

The A02B-0281-B502 board is mounted inside the CNC main unit rack together with other modules such as:

• Power supply module

• Servo interface modules

• Memory / system software modules (for example A87L-0001-0173 series)

• I/O interface boards

🔧 Typical Use

This module may be replaced when:

• The CNC CPU board fails

• During control unit repair

• When upgrading or replacing the main CNC control unit

🧠 Simple Summary

👉 A02B-0281-B502 = FANUC 0i-series CNC main CPU control board module.

✔ The difference between B500 and B502 versions is usually related to hardware revision or option configuration within the same FANUC control series.