Fanuc Daughter Memory Circuit Board Card A20B-2900-0580 A20B29000580 A2OB-29OO-O58O

FANUC A20B-2900-0580 14-Bit A/D Converter Module

Overview

The A20B-2900-0580 is a 14-bit A/D converter module in the A20B-2900 family. Maintenance-manual material and board catalogs identify A20B-2900-0580 specifically as a 14-bit A/D converter module, placing it in the signal-conversion side of the control hardware rather than in the display, CPU, or power-supply section.

That board role is important in real machine service.

An A/D converter module is part of the path where analog signals are converted into usable digital information for the control system. Because of that, the board should be matched by installed function and board code, not treated as a general-purpose spare circuit board.

Some online channels describe the part only as a circuit board, while one source incorrectly markets it as a power supply.

The stronger and more technically consistent identification is the 14-bit A/D converter module, because that description is supported by manual-based parts references and dedicated FANUC board catalogs.

Technical Data

Applications

This board is suitable for installed FANUC CNC control systems where the hardware already uses the A20B-2900-0580 converter-module position.

It is especially relevant in analog-signal path repair, board replacement, and restoration work where the control depends on the same analog-to-digital conversion function already built into the machine.

It is also a practical replacement part where the broader control hardware remains serviceable but the analog acquisition side has failed or become unstable.

In those cases, preserving the exact converter-board identity is the safest way to keep the original signal-conditioning chain unchanged.

Selection Guide

When selecting A20B-2900-0580, first confirm the installed board label directly, because some generic seller channels describe it only as a circuit board without naming the converter function.

The manual-based identification as a 14-bit A/D converter module is the most useful selection reference.

Second, verify that the machine fault actually points toward the analog input or signal-conversion path rather than toward an unrelated motherboard, display, or power issue.

This board is chosen by converter role, so the fault path should make sense for that installed function.

Third, prefer board-code confirmation over broad product-name assumptions.

Because some channels misclassify the part, the exact installed code remains the strongest and safest selection method.

Replacement Guidance

Before ordering, confirm the installed label, verify the board’s position in the analog conversion path, and check whether the failure symptoms are consistent with converter-side issues.

If the machine has more than one analog-related board in the cabinet, documenting the board slot and attached harnesses before removal is strongly recommended.

If the part is being sourced through used or refurbished channels, ask for board testing information when available.

Because this module affects signal conversion quality, a functional test history is especially helpful compared with purely cosmetic condition descriptions.

FAQ

Q1: What kind of board is A20B-2900-0580?
It is a 14-bit A/D converter module. That is the strongest and most technically consistent description for this model in manual-based and board-catalog references.

Q2: Why is the A/D converter description important?
Because it identifies the board by installed function. This module belongs to the analog-to-digital conversion path of the control, so it should be replaced according to that function rather than treated as a generic board.

Q3: Why do some seller listings call it only a circuit board?
Generic stock channels often use short inventory labels. In this case, manual-based references are more useful because they identify the actual board role as a 14-bit A/D converter module, which is the better fit for technical product content.

Q4: Is this a power supply board?
That description appears in at least one seller listing, but it conflicts with stronger technical references.

The more reliable and internally consistent positioning for this model is 14-bit A/D converter module, and that is the safer description to use in your product page.

Q5: What should be checked before buying?
Check the board label directly on the machine, confirm the board sits in the analog conversion path, and verify that the installed code is A20B-2900-0580.

Those checks are the best way to avoid replacing the wrong board in systems with multiple control PCBs.