The FANUC A20B-8100-0261 is a C Language Option PCB used in compatible LCD-mounted FANUC i-Series CNC configurations. FANUC documentation identifies it as the C Language Board or C Board, with hardware identification 0xCD.

The board provides dedicated hardware for a properly configured FANUC C Language Executor application. This function can support custom screen displays and machine-specific operations developed for the applicable CNC environment. Operation depends on the CNC software, licensed options and original machine application.

• 100% function tested before shipment
• In stock and prepared for prompt dispatch
• Worldwide DHL, UPS and FedEx shipping
• Testing video provided upon request

Product Details

Brand: FANUC
Part Number: A20B-8100-0261
Alternative Format: A20B81000261
Official Product Type: C Language Board / C Board
Common Product Name: C Language Option PCB
Hardware Identification: 0xCD
Board Interface: JNA F-BUS Backplane Connector
Product Series: A20B-8100
Application: Compatible FANUC C Language Executor configurations
Installation: Selected LCD-Mounted i-Series CNC units
Associated DRAM: A20B-3900-0042, 4 MB; configuration dependent
Availability: In stock
Core Exchange: Not accepted at this time
Testing: Board initialization and applicable functions checked in a compatible FANUC CNC configuration

C Language Board Function

FANUC describes the C Language Executor as a function that integrates FANUC libraries with a user application developed for the applicable CNC environment. It can be used for customized displays and user-specific operations when the required board, CNC option, system software and application files are present.

The A20B-8100-0261 does not contain a universal, ready-to-use machine application. Replacement may require restoration of the correct application data. Preserve available CNC, SRAM, option and application backups before removing the original PCB.

Hardware Identification

The A20B-8100-0261 connects through the JNA F-BUS backplane connector. FANUC lists it separately from serial communication, PMC, Ethernet and data-server boards, so it should not be classified as any of those product types.

FANUC renewal-parts information identifies A20B-8100-0151 as the older C Board and A20B-8100-0261 as the newer listed part. This does not guarantee plug-and-play substitution; the CNC hardware, software and original application must be checked.

Documented Control Families

FANUC maintenance information lists the board in selected LCD-mounted hardware configurations covered by:

• FANUC Series 16i / 160i / 160is
• FANUC Series 18i / 180i / 180is
• FANUC Series 21i / 210i / 210is

The PCB is not necessarily compatible with every control in these families. Compatibility depends on the motherboard, option slot, CNC software, C Language Executor option, board revision and machine-tool builder configuration.

Compatibility Check

Before ordering, verify:

• Complete PCB number A20B-8100-0261
• Board revision and additional label information
• CNC series, model and software series
• LCD-mounted hardware and F-BUS slot arrangement
• C Language Executor option status
• Custom application and backup availability
• Whether the DRAM module is fitted and required
• Existing system alarms

Send photographs of the original PCB, CNC label and installed slot if you need assistance confirming compatibility.

Replacement Note

Replacement may be considered after a confirmed board fault causes custom-application failure, initialization errors, option-board detection problems or visible damage. Similar symptoms can result from missing data, incompatible software, the backplane or incorrect CNC configuration, so diagnosis is recommended first.

Sales and Support

REACO CNC supplies the A20B-8100-0261 FANUC C Language Option PCB for compatible legacy CNC systems. Each unit is inspected and tested before delivery.

Contact us for pricing, warranty details and delivery time. Worldwide express delivery is available through DHL, UPS and FedEx.