1. General Information

• Part Number: A16B-1211-0310 / 02A

• Manufacturer: FANUC

• Type: CNC Axis Control PCB (Digital 3rd/4th Axis Board)

• Application: FANUC Zero A (0A) series CNC systems, machine tool retrofit, additional axis expansion

• Function: Controls 3rd and 4th servo/spindle axes; handles position loop, speed loop, and I/O logic

• Board ID: A320-1211-T310

2. Key Specifications

• Power Supply: +5 V DC (±5%, 1.8 A typical), ±15 V DC (±10%)

• Axis Capacity: Dual-axis (3rd & 4th) closed-loop control

• Feedback Interface: Serial encoder (α/β type), 50-pin & 68-pin ribbon connectors

• Onboard Memory: SRAM + EPROM (system firmware & motion parameters)

• Logic: 4-layer FR-4 industrial PCB, TTL/CMOS logic, opto-isolated I/O

• Power Consumption: ~15–20 W

3. Mechanical & Environmental

• Dimensions (H×W): 280 × 190 mm

• Weight: Approx 0.45 kg

• Mounting: Vertical installation in CNC rack

• Operating Temperature: 0 °C to +55 °C

• Storage Temperature: −30 °C to +85 °C

• Humidity: 10%–90% RH, non-condensing

4. Main Functions

1. 3rd/4th Axis Motion Control: Independent position, speed, and current loop control for two additional axes

2. Spindle or Servo Drive Interface: Outputs ±10 V speed commands; processes encoder feedback

3. CNC System Expansion: Adds two axes to base 2-axis Zero A systems

4. Diagnostics & Alarms: Onboard LEDs for power, axis status, and fault indication

5. Isolation & Noise Immunity: Opto-coupled I/O and differential signaling for industrial environments

5. Compatibility

• CNC Systems: FANUC Zero A (0A), 0, 10/11/12/15 series

• Servo Amplifiers: α-series, 6076 series

• Motors: α AC servo, spindle motors

• Replacement: Interchangeable with A16B-1211-0310 (any revision)

6. Common Alarms

• SV-01: Overcurrent (motor wiring/insulation fault)

• SV-02: Overvoltage (regeneration circuit issue)

• SV-03: Undervoltage (power supply/fuse fault)

• SV-04: Overheat (cooling/fan failure)

• SV-05: Speed deviation (encoder/cable fault)

• SV-06: Encoder signal error (connection/encoder fault)

7. Handling & Maintenance

• ESD Protection: Use anti-static wristband when handling

• Cleaning: Remove dust from connectors and PCB every 3–6 months

• Inspection: Check for swollen capacitors, burnt components, or loose pins

• Power Check: Verify +5 V and ±15 V before power-up

8. Safety Notes

• High Voltage: Power off and discharge capacitors (≥10 min) before service

• Qualified Personnel: Only trained technicians to install/repair

• Genuine Parts: Use FANUC OEM replacements for reliability