FANUC A05B-2400 Series Modules — A05B-2400-C060

Technical Dossier

Product Details And Specifications

FANUC A05B-2400 Series: Comprehensive Module Range and Technical Overview

The FANUC A05B-2400 series represents the core control hardware platform for FANUC Series 16, 18, and 21 CNC systems — among the most widely deployed CNC architectures in global heavy industry. These control units are installed across chemical processing plants, nuclear facility machining centers, petroleum refinery automation lines, automotive body-in-white production, and aerospace component manufacturing. The A05B-2400 designation covers the main control printed circuit board assemblies (PCBAs) and integrated control unit modules that govern axis interpolation, PMC ladder execution, spindle control interface, and operator panel communication within the FANUC FS16/18/21 architecture. Their long production lifecycle and broad OEM adoption have made them a critical spare parts category for facilities operating legacy CNC equipment with 10–25 year service horizons.

The Evolution of A05B-2400 Architecture

The A05B-2400 series emerged as FANUC transitioned from the earlier Series 0 and Series 10/11 platforms to the modular, high-speed bus architecture of the Series 16/18/21 in the early 1990s. The initial hardware revisions used discrete ASIC-based axis control with parallel backplane communication. Mid-generation revisions introduced FSSB (FANUC Serial Servo Bus) integration directly onto the main control board, reducing wiring complexity and improving servo loop bandwidth. Later production runs incorporated enhanced PMC (Programmable Machine Controller) memory capacity and expanded SRAM for part program storage. The A05B-2400 platform is fully compatible with FANUC Series 16i/18i/21i-A and -B control software when paired with the appropriate servo amplifier and I/O link modules. As of 2026, the entire A05B-2400 hardware family has entered the end-of-production phase; FANUC's current equivalent platform is the Series 30i/31i/32i-B, using the A05B-2600 and A05B-2518 board families. For facilities that cannot migrate to the 30i platform, long-term maintenance sourcing of A05B-2400 assemblies is the primary continuity strategy.

A05B-2400 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the A05B-2400 series, classified by functional category:

Main Control & CPU Boards

• A05B-2400-C060: Main CPU control unit board for FANUC Series 16/18/21 CNC systems; governs axis interpolation and PMC execution.
• A05B-2400-C061: Variant of C060 with extended SRAM capacity for larger part program storage requirements.
• A05B-2400-C062: High-speed CPU board revision with enhanced FSSB servo bus throughput for multi-axis configurations.
• A05B-2400-C064: Main control board for Series 21i-A; reduced axis count variant for 2–3 axis turning center applications.
• A05B-2400-C065: Series 18i-A main board; supports up to 6 controlled axes with dual-path PMC architecture.

I/O Link & Digital I/O Modules

• A05B-2400-C070: I/O Link master module; manages distributed I/O communication across the machine tool panel and peripheral devices.
• A05B-2400-C071: Digital input expansion module; 32-point DI interface for operator panel and limit switch integration.
• A05B-2400-C072: Digital output expansion module; 32-point DO interface for relay and solenoid valve control.
• A05B-2400-C073: Combined DI/DO module; 16-point input / 16-point output for compact machine tool panel wiring.
• A05B-2400-C074: High-density I/O module; 64-point DI/DO for large machining center and transfer line applications.

Communication & Network Adapter Modules

• A05B-2400-C080: RS-232C / RS-422 serial communication board; supports DNC program transfer and external device interfacing.
• A05B-2400-C081: Ethernet communication board for FANUC Series 16i/18i; enables network-based program management and remote diagnostics.
• A05B-2400-C082: PROFIBUS-DP slave adapter; integrates FANUC CNC into Siemens and third-party PROFIBUS fieldbus networks.
• A05B-2400-C083: DeviceNet slave communication module for integration with Allen-Bradley and Omron DeviceNet master controllers.

Power Supply Modules

• A05B-2400-C090: Primary DC power supply unit for A05B-2400 control rack; outputs +5V, +12V, +24V regulated rails.
• A05B-2400-C091: Redundant power supply module for high-availability CNC installations in continuous-process manufacturing environments.

Sourcing Hard-to-Find & Obsolete A05B-2400 Parts

The A05B-2400 series has been out of standard FANUC production since the mid-2010s. OEM new-old-stock (NOS) inventory is exhausted at most authorized distributors. DriveKNMS maintains a dedicated inventory of tested, refurbished, and NOS A05B-2400 assemblies sourced through controlled decommissioning programs, factory surplus acquisitions, and verified secondary market channels. For facilities operating FANUC Series 16/18/21 machines under long-term service agreements — particularly in nuclear, petrochemical, and defense manufacturing — DriveKNMS provides lifecycle extension support including board-level repair, firmware-matched replacement units, and cross-reference identification for revision-specific compatibility. Customers requiring multiple units for critical spares programs are encouraged to submit consolidated RFQ lists for volume pricing and lead-time commitments.

Quality Control for the A05B-2400 Range

All A05B-2400 modules processed by DriveKNMS undergo a structured multi-stage inspection protocol. Visual inspection covers PCB trace integrity, capacitor condition, connector pin alignment, and EPROM/SRAM chip seating. Functional testing is performed on dedicated FANUC Series 16/18/21 test rigs that replicate live machine backplane conditions, including FSSB servo bus communication verification, PMC ladder scan cycle confirmation, and I/O link polling response validation. Communication boards are tested against known-good master controllers to verify protocol handshake integrity. Power supply modules are load-tested across full rated current ranges with ripple and regulation measurements recorded. Each unit is issued a test report with pass/fail criteria documented prior to shipment.