Specifications

• Memory: 128 KB SRAM (battery-backed), 3.5 MB DRAM

• Processor: FANUC custom 32-bit RISC CPU

• Power Supply: DC 5V/1A (on-board logic)

• Interfaces: RS-232, serial spindle, analog spindle, FANUC system bus

• Operating Temp: 0°C to +55°C

• Storage Temp: -20°C to +70°C

• Humidity: 5%–95% RH (non-condensing)

• Protection: Overvoltage, overcurrent, ESD, short-circuit, and battery-backup protection

Compatibility

• CNC Systems: FANUC Series 21i-T/21i-M

• Spindle Amplifiers: αi series (A06B-6111), βi series

• Application: CNC machining centers, lathes, and grinding machines

Safety Instructions

1. Power off and wait ≥5 minutes for capacitor discharge before servicing.

2. Use an anti-static wrist strap to prevent ESD damage.

3. No hot-plugging of cables; power down first.

4. Replace the backup battery every 2–3 years to avoid data loss.

Installation

1. Shut down main power and lockout/tagout.

2. Insert the board into the designated CNC slot and secure screws.

3. Connect DC 5V power, RS-232, spindle control, and system bus cables.

4. Verify all connectors are fully seated.

5. Restore power; check LED status and reload CNC/PMC programs if needed.

Maintenance

1. Clean dust from PCB and connectors quarterly.

2. Inspect connectors for looseness, corrosion, or bent pins.

3. Check backup battery voltage; replace if low.

4. Keep cabinet dry and free of oil mist.

Troubleshooting

1. No power/LEDs off: Check DC 5V supply and board seating.

2. Data loss: Replace backup battery; check battery circuit.

3. Spindle alarm: Verify serial/analog wiring and amplifier communication.

4. Communication failure: Check RS-232 cable, baud rate, and handshake settings.