The FANUC A04B-0103-B303#H1A is a Series 31i-B5 CNC control unit documented for compatible FANUC ROBODRILL α-DiB5 systems. It combines CNC processing and a touch-operated interface.

FANUC documentation lists A04B-0103-B301, B303, B305 and B307 as Series 31i-B5 control-unit specifications. A documented machine order identifies the complete A04B-0103-B303#H1A number as a 31i-B5 CNC with a high-speed CPU, one slot and touch operation.

• 100% function tested before shipment
• Worldwide DHL, UPS and FedEx shipping
• Testing video provided upon request

Product Details

Brand: FANUC
Part Number: A04B-0103-B303#H1A
Base Number: A04B-0103-B303
Alternative Format: A04B0103B303H1A
Control Series: FANUC Series 31i-B5
Product Type: CNC Control Unit / CNC System Unit
Documented Application: Compatible FANUC ROBODRILL α-DiB5 configurations
Processor Configuration: High-Speed CPU
Expansion Configuration: One Slot
Operator Interface: Touch Operation
Configuration Suffix: #H1A
Category: FANUC CNC System / ROBODRILL Control
Testing: Fully function tested under an applicable FANUC configuration

31i-B5 Control Function

The A04B-0103-B303#H1A provides central CNC control and operator-interface functions within its original ROBODRILL configuration. It works with machine-specific PMC logic, CNC software, parameters, options, servo and spindle systems, I/O hardware and connected peripherals.

The high-speed CPU, single-slot structure and touch interface are documented for a #H1A order configuration. Software packages and machine options may be specified separately, so the complete operational specification cannot be determined from the A04B number alone.

B303 and Related Variants

FANUC ROBODRILL documentation distinguishes the 31i-B5 specifications A04B-0103-B301, B303, B305 and B307 from adjacent B302, B304, B306 and B308 units identified as Series 31i-B controls. Similar appearance or a shared A04B-0103 family does not establish interchangeability.

The #H1A suffix is part of the configuration. Match the complete A04B-0103-B303#H1A number wherever possible instead of selecting a replacement only by the 31i-B5 family name.

Compatibility Note

Before ordering, please verify:

• Complete A04B-0103-B303#H1A number
• ROBODRILL model, generation and machine serial number
• Existing control-unit and touch-interface configuration
• Installed slot and option hardware
• CNC software series and enabled options
• PMC ladder and machine-builder data
• Servo, spindle and I/O configuration
• Current alarms and fault symptoms

Compatibility depends on the original machine specification. This unit is not a confirmed universal replacement for every FANUC 31i-B5 control or A04B-0103 variant.

Replacement and Data Protection

The unit may replace a confirmed faulty A04B-0103-B303#H1A associated with startup, display, touch-interface or CNC system faults after the power supply, cabling, peripherals and configuration have been checked.

Before removal, back up all accessible CNC parameters, programs, offsets, macro variables, PMC data and machine-builder files. Installation may require restoration of the original software, options and machine data by a qualified technician.

Common Use Cases

• Replacement of a failed A04B-0103-B303#H1A control
• Repair of a FANUC 31i-B5 ROBODRILL system
• Restoration of CNC startup or operator-interface operation
• Maintenance of supported ROBODRILL α-DiB5 equipment

Sales & Support

Each FANUC A04B-0103-B303#H1A control unit is inspected and 100% function tested before delivery. REACO CNC provides repair evaluation, exchange options where available, warranty coverage, testing-video support and technical assistance.

Worldwide delivery is available through DHL, UPS, FedEx and other express carriers. Please send photos of the complete unit label and machine information for compatibility checking before purchase.