1 PC Used Fanuc A20B-2000-0880 PCB Board A20B20000880 A2OB-2OOO-O88O

A20B-2000-0880 | FANUC 2-Slot Backplane PCB — A02B-0218-B502 / A02B-0177-B511 / Series 20/21-TB CNC and LR-Mate Robot

One Backplane PCB, Two Generations, Two Applications

CNC-Shopping confirms the A20B-2000-0880 is the internal PCB inside two distinct backplane assemblies — and within each, it serves both CNC machine tool and robot applications:

A02B-0218-B502 (Series 21-TB): The yellow backplane "for inserting a Fanuc mainboard type LR-Mate by Fanuc Robotics or a system 21 Main CPU and a Fanuc I/O board for Fanuc CNC Robot or CNC machine-tools."

A02B-0177-B511 (Series 20-TA): The 20-TA generation uses the same A20B-2000-0880 PCB — confirming the board's cross-generation compatibility.

A single A20B-2000-0880 PCB serves:

• The FANUC Series 21-TB CNC (machining and turning centre controller)
• The FANUC LR-Mate compact industrial robot
• The FANUC Series 20-TA CNC

This dual-application flexibility reflects FANUC's approach of sharing card cage architecture across product lines.

Key Product Information

Two Slots — Compact Controller Architecture

The 2-slot configuration provides two card positions:

Series 21-TB CNC: Slot 1 holds the main CPU board; Slot 2 holds the I/O board. The A20B-2000-0880 distributes the shared bus and power rails between both boards.

LR-Mate robot: The robot main board occupies one slot; a second card (I/O or communication) occupies the other.

Application Scenarios

Series 21-TB CNC backplane fault: A FANUC Series 21-TB CNC develops bus communication errors. The A20B-2000-0880 inside the A02B-0218-B502 assembly is identified as the fault. Replacement restores bus communication.

LR-Mate robot backplane replacement: A FANUC LR-Mate robot's backplane develops a fault. The A20B-2000-0880 PCB is replaced.

FAQ

Q1: Is A20B-2000-0880 the complete backplane assembly or just the PCB?

The A20B-2000-0880 is the PCB inside the complete assembly. The A02B-0218-B502 is the complete 2-slot backplane (yellow housing + connectors + PCB). For isolated PCB replacement, A20B-2000-0880 is the component. CNC-Shopping supplies the complete A02B-0218-B502 assembly as the standard service item.

Q2: How does A20B-2000-0880 compare to A20B-2002-0771 (also a 2-slot backplane PCB)?

The A20B-2002-0771 is the PCB inside A05B-2400-C060 — a robotics-specific backplane. The A20B-2000-0880 is the PCB inside A02B-0218-B502 and A02B-0177-B511 — serving both Series 20/21 CNC and LR-Mate robot. Different product lines, different assemblies, not interchangeable.

Q3: Does replacing A20B-2000-0880 require data backup?

The backplane PCB does not store CNC parameters or robot programmes. Replacing A20B-2000-0880 does not affect stored data. As a precaution, always perform a full backup before any controller hardware maintenance.

Q4: What bus signals does A20B-2000-0880 carry between its 2 slots?

The backplane routes address bus, data bus, control signals, and power rails between both card slots. A fault on any conductor affects both installed cards simultaneously.