Fanuc A16B-3200-0010 CPU Card for CNC Control

The Fanuc A16B-3200-0010 is a central processor unit (CPU) card used in Fanuc Series 16i, 18i, and 21i CNC (computer numerical control) systems. This board serves as the main computing engine for controlling machine tools such as mills, lathes, and machining centers. It executes part programs, manages axis interpolation, and handles I/O communication.

Processor and Memory

The card features a 32-bit RISC processor operating at 64 MHz. It includes 8 MB of DRAM and 4 MB of flash ROM for system firmware. User part programs and parameters are stored in non-volatile SRAM with battery backup. The board supports up to 256 KB of programmable controller (PMC) ladder logic.

Bus Interfaces

It connects to the Fanuc CNC backplane via a dedicated high-speed bus, linking to servo modules, spindle drives, and I/O units. The board also provides an external interface for the MDI panel, handwheel, and serial communication (RS-232C). A built-in PMC (programmable machine controller) handles discrete I/O with up to 256 inputs and 256 outputs.

Software Compatibility

The A16B-3200-0010 runs Fanuc's proprietary CNC software, supporting multiple control axes (up to 4 axes simultaneously) and optional functions such as rigid tapping, tool compensation, and macro B programming. It is compatible with Fanuc’s FAPT ladder III for PMC development.

Diagnostic Features

Onboard LEDs indicate CPU run, alarm, and bus activity. The card includes a watchdog timer that resets the system in case of software hang. A seven-segment display shows error codes for troubleshooting. The battery-backed memory offers status LEDs for low battery warning.

Physical and Environmental

Dimensions: 265 x 208 mm (Eurocard format). Operating temperature: 0°C to 45°C; storage: -20°C to 60°C. Power consumption: 5V DC at 2.5A, 12V DC at 0.5A. The card is designed for forced-air cooled cabinets. Weight is approximately 0.5 kg.

Installation and Replacement

The CPU card plugs directly into the backplane of the Fanuc CNC rack. When replacing, user parameters and programs must be backed up via RS-232 or memory card. Fanuc provides detailed field replacement procedures in the maintenance manual. No special tools are required beyond a standard screwdriver.

Applications

Used as the main controller in many industrial CNC machines, including those from Fanuc, Mazak, Doosan, and Haas (with Fanuc controls). It is a critical component for machine shops and manufacturing lines.

Conclusion

The Fanuc A16B-3200-0010 CPU card is the core computing module for Series 16i/18i/21i CNC systems. Its robust design, ample memory, and real-time performance ensure precise machine tool control.