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A20B-8101-0280 | FANUC Zero i-C (Series 0i-C) Main PCB — MMX Pentium / Multi-Axis / PC Functions / Plug-In Modules

Series 0i-C — Where the Zero i Platform Matured

The FANUC Series 0i-C (Zero i Model C) is the third hardware generation of the 0i platform. Each successive 0i generation brought meaningful capability improvements:

0i-A (first generation): Established the 0i hardware architecture — a cost-optimised CNC with 486DX2 processing and a small I/O complement for basic machining and turning applications.

0i-B (second generation): Refined the board architecture, improved the servo and spindle parameter capabilities, and extended communication options.

0i-C (third generation): Upgraded to an MMX Pentium processor — a significant step up in processing performance from the 486DX2 class hardware of earlier generations. The 0i-C also introduced the built-in PC function as standard, allowing the CNC to communicate over Ethernet and support HMI applications directly on the control unit.

The A20B-8101-0280 is the main PCB (master board) for this 0i-C generation — the central hardware assembly that all option modules connect to within the CNC control unit.

Key Specifications

Built-In PC Functions — Connectivity for Modern Production Environments

The 0i-C generation's built-in PC functions allow the CNC to:

• Connect to a plant network via Ethernet for DNC programme streaming
• Run data collection tasks that report production counts and machine status to MES systems
• Support remote monitoring and diagnostics from a connected PC
• Transfer programmes and parameters between the CNC and networked storage

These capabilities were added features on earlier 0i generations; on the 0i-C, they come as part of the main board's standard architecture.

Application Scenarios

0i-C CNC main board failure: A FANUC 0i-C CNC machining centre fails to boot, displaying system alarm codes pointing to the main PCB. After confirming memory modules and power supply are intact, the A20B-8101-0280 is replaced. The system reloads from the FROM modules and resumes normal operation.

Ethernet connectivity restoration: A 0i-C CNC loses its Ethernet connection after a board-level fault. Replacing the A20B-8101-0280 restores the built-in Ethernet port function alongside all other CNC capabilities.

FAQ

Q1: What plug-in modules connect to the A20B-8101-0280?

The A20B-8101-0280 provides module slots for FROM (Flash ROM — CNC system software), SRAM (battery-backed parameter and programme storage), optional DRAM expansion modules, and graphics or communication option boards. The configuration of installed modules determines the specific capabilities of the 0i-C CNC system.

Q2: Is the A20B-8101-0280 compatible with both 0i-MC (machining centre) and 0i-TC (turning centre) configurations?

The main board hardware is common across the 0i-C platform regardless of machine type. The CNC type (M = machining centre, T = turning centre) is determined by the FROM module content — the system software image installed in the FROM. The same A20B-8101-0280 serves both, with the CNC type resolved at the software level.

Q3: What data must be backed up before replacing the A20B-8101-0280?

Before removing the main board, back up: all CNC parameters, part programmes, tool offset data, work offset data, and the PMC ladder programme. These items reside in SRAM and FROM modules, but a full backup ensures recovery even if a module develops an issue during the replacement. Store backups on memory card, USB (where supported), and RS-232C PC backup simultaneously.

Q4: Does the A20B-8101-0280's built-in PC function require separate configuration after board replacement?

The Ethernet and PC function parameters (IP address, subnet mask, gateway, DNC server settings) are stored in the CNC's parameter memory — not in the main board. After fitting a replacement A20B-8101-0280, these parameters are restored from the backup and the Ethernet function should resume normally. If the MAC address of the replacement board differs, update DHCP reservations or fixed IP assignments in the plant network configuration.

Q5: How does the 0i-C compare to the 0i-D generation in terms of main board hardware?

The 0i-D generation uses the A20B-8200-xxxx series main boards — a different hardware generation with updated processor architecture, higher DRAM capacity, and an updated PC function interface. The A20B-8101-0280 (0i-C) and A20B-8200-xxxx (0i-D) main boards are not interchangeable. Systems built on 0i-C hardware continue operating with 0i-C main boards for their entire service life.