Description
🔧 A20B-2003-0420 — Description
A20B-2003-0420 is a FANUC CNC/PLC control PCB (printed circuit board) used as an add-on control or I/O board in industrial CNC systems.
📌 Full Technical Description
- Manufacturer: FANUC
- Part Number: A20B-2003-0420
- Type: PLC / control PCB (add-on board)
- Series: A20B-2003
- Application: CNC control cabinet / machine control system
⚙️ Function (What it does)
- Acts as a control / PLC add-on board inside the CNC system
- Handles:
- Relay output control (machine actuators, relays)
- Signal processing for machine control
- Interface between CNC controller and external devices
👉 In simple terms:
It is a control board that helps operate machine outputs and control logic inside a FANUC CNC system.
🔍 Key Features
- Integrated on-board transformers
- Provides relay output signals for machine operations
- Used as a PLC/add-on control board
🏭 Where it is used
- FANUC CNC control systems
- Industrial machines such as:
- CNC lathes
- Machining centers
- Automated production systems
👉 Typically installed inside the CNC control cabinet, working with:
- Main CPU boards (A20B / A16B series)
- Servo & spindle drives (A06B series)
🧩 System Role
CNC CPU → A20B-2003-0420 (PLC/control board) → Relay outputs → Machine devices
⚠️ Important Notes
- ❗ Discontinued by manufacturer
- ❗ Usually available as:
- Refurbished
- Repair/exchange unit
- ❗ Must match exact system configuration
- ❗ Failure symptoms:
- Machine outputs not working
- Relay faults
- CNC control signal issues
👍 Summary
A20B-2003-0420 = FANUC PLC / control add-on PCB
➡️ Provides relay outputs and control interface
➡️ Used inside CNC control cabinet
➡️ Connects CNC system to machine electrical components