A350-2002-T324 Fanuc Circuit Board

A350-2002-T324 | FANUC A350 PCB Fabrication Number — A20B-2002 I/O and Interface Board Family / CNC Operator Panel PCB

A350-2002 — The Fabrication Identity for A20B-2002 Boards

Just as the A350-2101-Txxx fabrication numbers correspond to A20B-2101 drive boards, the A350-2002-Txxx numbers identify boards in the A20B-2002 commercial series. The A20B-2002 series covers a range of CNC interface and I/O boards that sit between the CNC controller and the machine's operator-facing components.

The A350-2002-T324 is the fabrication label for a specific board in this family. Its T324 suffix is the drawing revision identifier within the A350-2002 fabrication series.

Key Product Information

The A20B-2002 Board Family — I/O, Backplane, and Operator Interface

The A20B-2002 series serves multiple functions within FANUC CNC control systems:

Operator Panel I/O Boards: The most widely recognised products in this series include the 48DI/32DO operator panel I/O boards — including the A20B-2002-0520 (with MPG interface) and A20B-2002-0521 (without MPG). These boards sit between the operator's physical controls (pushbuttons, switches, indicator lamps) and the CNC's PMC, handling 48 digital inputs from panel switches and 32 digital outputs to panel lamps via the I/O Link serial bus.

Backplane and Rack Interface Boards: Other boards in this series serve as backplane PCBs for CNC control rack assemblies, providing the bus infrastructure for multi-slot CNC card assemblies. These boards physically connect multiple module cards in the same rack through a shared backplane bus.

Interface Modules: Additional A20B-2002 variants provide specialised interface functions — such as MPG connection units and operator panel communication modules — that extend the CNC's connectivity to machine panel devices.

The A350-2002-T324 fabrication number maps to one specific board within this functional family.

Application Scenarios

Operator panel I/O fault: An i-series CNC develops random operator panel behaviour — specific pushbuttons not responding, indicator lamps failing to illuminate correctly. The board-level fault is traced to the A350-2002-T324. Replacing the board restores complete operator panel I/O function.

Panel interface board identification: During maintenance, a technician identifies the A350-2002-T324 from the board's label during a CNC control unit inspection. Cross-referencing this fabrication number with the maintenance documentation confirms the board's function and the correct replacement.

FAQ

Q1: How does the I/O Link connect the A350-2002-T324 to the CNC?

The A20B-2002 family boards communicate with the CNC via the FANUC I/O Link — a high-speed serial protocol that connects I/O units and operator panel boards to the CNC's PMC over a single twisted-pair cable (or optical fibre). The I/O Link master is in the CNC; the A350-2002-T324 (or its A20B-2002 equivalent) is a slave node. All 48 input states and 32 output commands are transmitted in each I/O Link scan cycle. This replaces the need for individual wired connections from every switch and lamp to the CNC.

Q2: What is the difference between A350-2002-T324 and the commercial A20B-2002-xxxx number?

The A350-2002-T324 is the PCB fabrication number — FANUC's internal manufacturing drawing reference printed on the board. The A20B-2002-xxxx is the commercial order number used for purchasing and in maintenance manuals. Both references identify the same physical PCB. The fabrication number is read from the board label; the commercial number is found in spare parts lists and purchase documentation.

Q3: Can an A350-2002 board be replaced without updating the CNC's PMC programme?

Yes. The PMC ladder programme addresses I/O by I/O Link address — not by the specific board hardware version. Replacing a failed A350-2002-T324 with a correctly configured replacement board at the same I/O Link address restores the PMC's I/O communication transparently. No PMC programme changes are needed for a like-for-like board replacement.

Q4: How many A350-2002 (A20B-2002) boards can be connected in one CNC system?

The I/O Link supports multiple slave nodes in a daisy-chain configuration. The maximum number of nodes depends on the CNC's I/O Link capacity — each node occupies a defined number of I/O Link addresses. For most i-series CNC systems, the I/O Link supports enough nodes to accommodate multiple operator panel boards alongside I/O units for machine I/O, power magnetics cabinet, and other peripheral interfaces.

Q5: Does replacing the A350-2002-T324 require any I/O Link address reconfiguration?

Only if the replacement board is configured with a different I/O Link node address than the failed board. Standard replacement with an identically configured board at the same address requires no reconfiguration — the PMC resumes communication automatically after the board is powered up. If the replacement board has a different address configuration, the CNC's I/O Link parameter settings must be updated to match. Verify the address configuration from the machine's electrical documentation before fitting the replacement.