The FANUC A02B-0327-B802 is a configurable Series 31i-B CNC control basic unit used as the central hardware platform in compatible FANUC control-system installations.

An available FANUC system configuration sheet identifies the exact A02B-0327-B802 specification as the system’s Basic Unit. The complete CNC configuration is then formed by installing the required CPU card, memory module, servo-control card, power-supply unit, main board, communication boards, software functions, and CNC options.

This means the A02B-0327-B802 should not automatically be treated as a universally complete or plug-and-play controller. Its actual functionality depends on the hardware and software fitted to the unit.

The model is commonly listed in organic search results under names such as:

• FANUC A02B-0327-B802 CNC Controller
• FANUC 31i-B Control Basic Unit
• FANUC Series 31i-B Control Unit
• FANUC CNC System Basic Unit
• FANUC 31i-LB Controller

The first four terms are suitable general SEO descriptions. The 31i-LB designation should only be used as the primary system name when the installed software, nameplate, or original machine documentation confirms a laser-control configuration.

The unit may be used as a replacement when a confirmed control-system fault causes startup failure, intermittent CNC operation, loss of communication with peripheral cards, memory or CPU-related alarms, servo-interface problems, or damage to the control-unit hardware.

• Control functions tested under an applicable FANUC configuration
  
• In stock and prepared for prompt dispatch
  
• Worldwide DHL, UPS, and FedEx shipping

Product Details

• Brand: FANUC
• Part Number: A02B-0327-B802
• Alternative Format: A02B0327B802
• Product Type: CNC Control Basic Unit
• Primary CNC Family: FANUC Series 31i-B
• Possible Configured System: Series 31i-LB when specifically equipped and confirmed
• Product Series: A02B-0327
• Hardware Structure: Configurable CNC Basic Unit
• Control-Power Class: 24VDC
• Application: Compatible FANUC CNC Control Systems
• Category: FANUC CNC Controller / Control System Basic Unit
• Condition Options: New, Refurbished, or Used, subject to available stock
• Testing: Inspected and tested before shipment

The exact A02B-0327-B802 basic unit has been documented in a populated configuration containing separate CPU, memory, servo, power-supply, communication, and main-board components.

Example Documented Hardware Configuration

One documented system using the A02B-0327-B802 basic unit includes:

• CPU Card B2 128MB: A02B-0323-H010
• FROM/SRAM Memory P: A02B-0323-H057
• Servo Card B12: A02B-0323-H071
• Power Supply Unit: A02B-0323-H115
• DeviceNet Board: A02B-0323-J301
• Main Board D2: A02B-0327-H200

These are components from one documented CNC configuration and should not be presented as the fixed contents of every A02B-0327-B802 unit. Actual installed cards and software must be confirmed from the product being supplied.

31i-B and 31i-LB Clarification

The FANUC Series 31i-B is a high-performance CNC family used across advanced machine-control applications. FANUC’s series-level documentation lists support for multiple paths, numerous controlled axes, high-speed processing, networking, PMC functions, and advanced motion control. Exact capabilities depend on the purchased options and system configuration.

The Series 31i-LB is a specialized CNC configuration developed for laser-processing systems. FANUC describes it as a laser-machine control offering functions related to laser power control, high-speed laser commands, gap control, and synchronization between the laser and machine axes.

Because the A02B-0327-B802 basic unit has also been documented in an NC System Type M configuration, the hardware number alone is not enough to classify every unit as 31i-LB.

Configuration and Data Note

Before replacing a FANUC CNC control basic unit, the original machine data should be backed up whenever possible. Depending on the system, required data may include:

• CNC parameters
• PMC ladder and PMC parameters
• Part programs and macro programs
• Tool-offset and work-coordinate data
• Pitch-error compensation data
• Servo and spindle parameters
• System software and option information
• SRAM and FROM memory contents
• Ethernet and field-network settings

A replacement basic unit may require software installation, option restoration, parameter loading, and hardware-card transfer before the machine can operate correctly.

Compatibility Note

Before ordering the A02B-0327-B802, please verify:

• Complete FANUC part number
• System designation shown during CNC startup
• Whether the system is 31i-B, 31i-LB, or another configured variant
• Main board and CPU-card numbers
• FROM/SRAM memory specification
• Servo-card model
• Installed communication and network boards
• System software series and edition
• CNC option list
• Number of paths, controlled axes, and spindles
• Display and MDI configuration
• Availability of the original SRAM and parameter backup
• Whether a bare basic unit or a fully populated controller is required

Two A02B-0327-B802 units may carry the same basic-unit number while containing different cards, memory capacities, software, and CNC options.

Common Use Cases

• FANUC Series 31i-B CNC controller replacement
• Restoration of a failed CNC control basic unit
• Troubleshooting CPU, memory, or system-startup faults
• Repair of communication and peripheral-card problems
• Rebuilding a complete FANUC CNC control configuration
• Transferring original PCBs into a replacement chassis
• Preparing a configured spare controller for maintenance
• Supporting a confirmed FANUC 31i-LB laser-control system

Sales & Support

Each A02B-0327-B802 CNC basic unit is inspected and tested with an applicable FANUC system configuration before delivery.

Worldwide shipping is available through DHL, UPS, FedEx, and other express carriers. REACO CNC provides CNC controller repair, warranty coverage, testing-video support, software and configuration assistance, and technical support for FANUC control systems.