The FANUC A20B-2100-0251 is a servo control PCB used in compatible FANUC Alpha Series two-axis servo amplifier modules.

FANUC maintenance documentation identifies this board as the old-specification printed circuit board number corresponding to A20B-2100-0541. It is used in selected A06B-6096 SVM2 servo amplifier modules equipped with an FSSB interface.

Within the compatible servo amplifier, the board supports servo-control processing and communication between the CNC control system and the associated two-axis amplifier hardware.

The A20B-2100-0251 is commonly described in organic search results as an Axis Control Board, Alpha SVM Control Board, Servo Control Board, or Alpha SVM2 Servo Drive Board.

This is a legacy FANUC board number. Official documentation lists A20B-2100-0541 as the newer printed-circuit-board specification, with A20B-2100-0251 shown in parentheses as the earlier specification. Compatibility and replacement requirements must be verified before installation.

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

Product Details

• Brand: FANUC
• Part Number: A20B-2100-0251
• Alternative Format: A20B21000251
• Type: Servo Control PCB / Axis Control Board
• Common SEO Name: Alpha SVM2 Servo Drive Board
• Axis Configuration: Two Axis
• Communication Interface: FSSB
• Amplifier Family: FANUC Alpha SVM2
• Referenced Amplifier Series: A06B-6096
• Newer PCB Specification: A20B-2100-0541
• Product Series: A20B-2100
• Application: FANUC CNC Servo Amplifier Systems
• Function: Two-axis servo control and amplifier communication
• Status: Legacy / Old-Specification Board
• Category: FANUC Servo Amplifier PCB / CNC Drive Control Board

Referenced Servo Amplifiers

FANUC documentation associates the A20B-2100-0251 old-specification PCB with the following two-axis FSSB servo amplifier modules:

• A06B-6096-H201 — SVM2-12/12
• A06B-6096-H202 — SVM2-12/20
• A06B-6096-H203 — SVM2-20/20
• A06B-6096-H204 — SVM2-12/40
• A06B-6096-H205 — SVM2-20/40
• A06B-6096-H206 — SVM2-40/40

The same manual lists A20B-2100-0253 / A20B-2100-0543 for the larger H207–H209 SVM2 configurations, so those amplifiers should not automatically be included under A20B-2100-0251.

Compatibility Note

Before ordering, please verify:

• Complete servo amplifier model number
• Full PCB number and revision suffix
• Two-axis SVM2 configuration
• FSSB interface requirement
• Original wiring-board number
• Connector and component layout
• Whether the old A20B-2100-0251 or newer A20B-2100-0541 specification is required
• Whether HRV3 control is used

FANUC states that HRV3 configurations require the applicable A16B wiring board and A20B-2100-054X printed circuit board to be used together. Therefore, replacing only one board without checking the complete configuration may cause incompatibility.

Common Use Cases

• FANUC Alpha SVM2 control-board replacement
• A06B-6096-H201 through H206 servo amplifier maintenance
• Troubleshooting FSSB communication faults
• Repair of two-axis servo amplifier startup problems
• Replacement of damaged servo-control components
• Restoration of unstable or intermittent axis operation
• Preparation of a tested legacy spare board

Sales & Support

Each A20B-2100-0251 servo control board is inspected and tested under applicable conditions before delivery.

Worldwide shipping is available through DHL, UPS, FedEx, and other express carriers. REACO CNC provides PCB repair service, warranty coverage, testing-video support, and technical assistance for FANUC servo amplifier boards and CNC drive components.