A20B-2901-066
Description
Specifications
Processor: FANUC custom 32-bit RISC CPU
Memory: Typically 4 MB DRAM, 2 MB flash (system/PMC)
Power Supply: DC 24V (auxiliary), DC 5V (on-board logic)
I/O: 24 digital inputs / 16 digital outputs (24VDC); 2 analog inputs (0–10V)
Communication: 2×RS-232, 1×RS-422/485, parallel I/F, FANUC bus interface
Operating Temp: 0°C to +40°C (non-condensing)
Storage Temp: -20°C to +60°C
Humidity: 5%–95% RH (non-condensing)
Protection: Overvoltage, overcurrent, ESD, surge, and short-circuit protection
Compatibility
CNC Systems: FANUC Series 16i, 18i, 21i (legacy 16/18)
Servo/Spindle: αi/βi series amplifiers (A06B-6110/6130)
Machine I/O: FANUC I/O units, operator panels, and peripheral devices
Safety Instructions
Power off and wait ≥5 minutes for capacitor discharge before servicing.
Use an anti-static wrist strap to prevent ESD damage to sensitive components.
No hot-plugging of cables or connectors; power down first.
Do not modify on-board circuits or jumpers; this will void warranty and risk damage.
Installation
Shut down main power and lockout/tagout the system.
Insert the board into the designated CNC slot and secure with screws.
Connect 24V DC power, communication cables (RS-232/422), I/O wiring, and FANUC bus.
Verify all connectors are fully seated and locked.
Restore power; check LED status and perform a cold start with PMC/CNC program reload.
Maintenance
Clean dust from the PCB surface and connectors quarterly.
Inspect connectors for looseness, corrosion, or bent pins.
Check on-board LED indicators for fault codes during operation.
Keep the control cabinet dry, free of oil mist, and within temperature specs.
Troubleshooting
No power/LEDs off: Check 24V DC supply and board seating.
PMC alarm: Reload PMC program; check I/O wiring and ground connections.
Communication failure: Verify RS-232/422 cables, baud rate, and handshake settings.
CNC boot failure: Check flash memory and reload CNC system software。
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