Fanuc control board A20B-2900-0143 A2OB-29OO-O143 A20B29000143

FANUC A20B-2900-0143 PMC Module with PMC-RA1

The FANUC A20B-2900-0143 is a control-side PCB used in the PMC section of a CNC system. Public listings consistently describe it as a PMC module, and more specifically as a PMC module with PMC-RA1 and without SLC.

That makes it a board intended for PMC control tasks rather than spindle drive, display handling, or memory expansion.

For repair or replacement work, this kind of module is usually selected by exact board reference and installed control configuration.

In practice, the important point is not just that it is a FANUC PCB, but that it belongs to the PMC control layer of the machine. 

Public sources also show revision-style suffixes in the field, such as /04A and /07A, which means label-level verification remains important before ordering.

Key Product Data

Typical Applications

This module is most relevant in CNC systems where the PMC control section needs board-level replacement without changing the surrounding architecture.

It is typically suited to PMC-related troubleshooting, legacy FANUC control repair, and exact-reference replacement work where the original board function needs to remain unchanged. 

FAQ

Q1. What type of board is the A20B-2900-0143?
It is a PMC module. Public sources repeatedly identify it as a PMC module with PMC-RA1 and without SLC, which places it in the PMC control section of the CNC rather than in the display, spindle, or memory section.

Q2. What does this module do in the system?
Its role is tied to PMC control. Based on the public product descriptions, it should be understood as a board used in the machine-control logic side of the FANUC system, not as a power-stage board or operator display card. 

Q3. What should be checked when selecting A20B-2900-0143?
The main checks are the exact part number, the installed control family, and the board label including any suffix or revision mark. Since public listings show versions such as A20B-2900-0143/04A and /07A, the full label on the installed board is worth confirming before replacement.

Q4. How should the “PMC-RA1 & w/o SLC” description be understood?
That wording is the most useful functional identifier publicly available for this part. It distinguishes this board from other A20B-2900 modules that belong to different control or I/O functions, so it should be treated as a matching point rather than ignored as a secondary label.

Q5. What is most important to confirm before replacement?
Before replacement, confirm the exact board number, the installed PMC configuration, and whether the machine already uses the same PMC-RA1 / no-SLC arrangement. If the original module label includes an added suffix, that full code should be matched rather than relying on the base part number alone.