The FANUC A16B-3200-0270 is a main CPU PCB used in compatible FANUC Series 21/210-Model B CNC control configurations.

Organic product references consistently identify the board as a 21/210-B Control Main CPU PCB, while documented controller assemblies show the A16B-3200-0270 installed in selected Series 21-MB control units.

As the main control board, it forms the central hardware platform for processing CNC system software and coordinating compatible memory, servo-control, PMC, display, communication, and optional control modules.

FANUC documentation shows that Series 21/210-B main-board configurations may include modules or functions associated with:

• CNC control software
• Flash ROM and SRAM
• Spindle-control data
• PMC functions
• Servo-axis control
• Display and graphics control
• Optional communication and interface functions

The exact installed functions depend on the board edition and the modules fitted to the supplied PCB.

The A16B-3200-0270 may be suitable for replacing a confirmed faulty main board associated with CNC startup failure, CPU alarms, watchdog alarms, memory errors, unstable system operation, loss of communication with control modules, or damage to the PCB circuitry.

• Main-board startup and control functions tested before shipment
  
• In stock and prepared for prompt dispatch
  
• Worldwide DHL, UPS, and FedEx shipping

Product Details

• Brand: FANUC
• Part Number: A16B-3200-0270
• Alternative Format: A16B32000270
• Product Type: Main CPU PCB
• Common Product Name: CNC Control Main Board
• Referenced CNC Family: FANUC Series 21/210-Model B
• Documented Application: Selected Series 21-MB control units
• Product Series: A16B-3200
• Board Structure: Configurable / Module-Dependent
• Application: Compatible FANUC CNC Control Systems
• Category: FANUC Main Board / CNC CPU PCB
• Testing: Inspected and tested under an applicable FANUC configuration
• Stock Configuration: Bare, partially populated, or fully populated subject to the supplied unit

Because the installed memory and control modules can vary, the bare PCB number alone does not define the complete CNC hardware or software configuration.

Board Configuration Note

The A16B-3200-0270 may be supplied in different populated configurations.

Depending on the original CNC system, the board may contain or work with different:

• Memory and spindle modules
• Flash ROM and SRAM capacities
• Servo-control modules
• PMC hardware or software
• Graphics and display-control functions
• Communication interfaces
• Optional feature modules
• System software series and editions

FANUC’s Series 21/210-B maintenance documentation provides separate system-configuration screens for identifying the PCBs, modules, software series, and software versions installed in a control.

For this reason, two boards carrying the same base number may not be ready for direct exchange when their mounted modules, software, or hardware revisions differ.

Data Backup Warning

Before removing or replacing the main CPU PCB, the original CNC data should be backed up whenever the system remains accessible.

FANUC specifically warns that replacing the main board can cause all data stored in memory to be lost, after which the NC data must be entered or restored again.

Depending on the machine configuration, the required backup may include:

• CNC parameters
• PMC ladder and PMC parameters
• Part programs
• Macro programs and variables
• Tool offsets
• Work-coordinate data
• Servo and spindle parameters
• Pitch-error compensation data
• System software and option information
• SRAM or memory backup files

A replacement board may require module transfer, software loading, parameter restoration, and system initialization before normal operation can resume.

Compatibility Note

Before ordering the A16B-3200-0270, please verify:

• Complete FANUC board number
• PCB revision printed after the base number
• CNC system model and series
• Whether the control is 21-TB, 21-MB, 210-TB, or 210-MB
• Existing memory and spindle modules
• Servo-control configuration
• PMC type and ladder data
• Display and graphics configuration
• Installed communication or option boards
• System software series and version
• Required axis and spindle configuration
• Availability of the original NC data backup
• Whether a bare or fully populated board is required

The board should be matched according to the complete control configuration rather than the A16B-3200-0270 base number alone.

Common Use Cases

• FANUC Series 21/210-B main-board replacement
• Repair of a CNC control that cannot complete startup
• Troubleshooting CPU or watchdog alarms
• Diagnosis of memory and system-configuration faults
• Repair of intermittent CNC control operation
• Transfer of original modules to a replacement PCB
• Restoration of a legacy FANUC control system
• Preparation of a tested spare main CPU board

Sales & Support

Each A16B-3200-0270 main CPU PCB is inspected and tested under an applicable FANUC control configuration before delivery.

Worldwide shipping is available through DHL, UPS, FedEx, and other express carriers. REACO CNC provides main-board repair service, warranty coverage, testing-video support, data-restoration guidance, and technical assistance for FANUC CNC control systems.