FANUCA20B-8100-0460Main CPU Motherboard PCB for Series 160i-A CNC Control, Revision 07E

Product Description

What this part is

A Fanuc A20B-8100-0460 main CPU board, revision 07E — the processor motherboard of a Fanuc Series 160i-A CNC control. This is the top-tier board in the control: it carries the CNC processor, the working DRAM, the flash memory that holds the CNC system software, and the sockets and connectors for the plug-in option modules, the LCD unit and the servo and spindle interfaces. Everything else in the control hangs off it.

This is a CPU-tier board, not an expansion or option card. Supplied as a bare board.

Decoding the order code

A20B: Fanuc printed-circuit-board prefix. On the i-series controls A20B covers the integrated CPU motherboards as well as the smaller sub-boards; A16B is the prefix used on the older large multi-layer master cards.

8100: the control generation group. The 8100 group belongs to the Fanuc i-series generation, this board specifically to the Series 160i-A.

0460: the specific board within that generation.

/07E: the board edition, or revision level. A revision suffix, not a different part. Editions of the same base number are normally interchangeable, but on a CPU board the edition can matter because the CNC system software must be a version the hardware edition supports.

Published specifications

Function: main CPU board / motherboard, Fanuc Series 160i-A CNC.

Processor: integrated Intel MMX Pentium class, 100 MHz.

Working memory: 64 MB DRAM.

System memory: 8 MB FROM (flash ROM).

Expansion: provision for LCD mounting and for plug-in modules covering memory, graphics and I/O expansion.

Capability: supports multi-axis servo and spindle coordination and the 160i built-in PC functions.

What these specs mean in practice

The 8 MB is FROM — flash ROM — rather than SRAM. That distinction matters: FROM holds the CNC system software and any custom macro or C Executor application, while the volatile SRAM that holds parameters, tool offsets and part programs is battery-backed and lives elsewhere in the control. The FROM contents belong to the machine, and a board from a different machine may carry a different software series and edition.

Because the Series 160i is the CNC-with-built-in-PC variant, boards from the plain Series 16i/18i/21i family are a different base number and are not substitutes. The number silk-screened on the board is the one to match.

Quantity and configuration

Sold as 1 piece — one bare main CPU board, edition 07E. New old stock, in an opened box. The CNC system software, ladder and parameter set belong to the machine and are loaded from the machine owner’s own backup at commissioning.

Interchange guidance

Searchable equivalents of the same part number: A20B-8100-0460, A20B81000460, A20B 8100 0460, A20B-8100-0460/07E, A20B81000460 07E. Other editions of the same base number are the same part at a different revision level. Adjacent 8100-group numbers such as A20B-8100-0620 or A20B-8100-0661 are different boards, not equivalents.