Fanuc Daughter Servo Board A20B-2900-0310 A20B29000310 A2OB-29OO-O31O

A20B-2900-0310 | FANUC Series 16 / 18 Graphic Control Module PCB — SMD Construction / F16 / F18 CNC Display Graphics

Graphics in a CNC System — What the Board Renders

The operator's display on a FANUC Series 16 or 18 CNC is not simply a text terminal. It renders graphical content that the operator depends on throughout the machining cycle:

Tool path graphics: The CNC can display the programmed cutting path in graphical form before and during automatic execution. The operator verifies the tool path geometry visually before committing to the cut — checking for collisions, confirming approach and retract moves, and inspecting the overall part profile.

Graphic diagnostics: Servo following error, current waveforms, and system status data can be displayed graphically over time. These displays support troubleshooting of servo and spindle behaviour that would be invisible in a pure text format.

Part programme display: Programme content is rendered with graphical elements — block highlighting, cursor positioning, and formatted programme text — all of which pass through the graphic control module.

The A20B-2900-0310 is the dedicated SMD module that provides the hardware graphics engine for these display functions in Series 16 and 18 CNC systems.

Key Product Information

Daughter Board Configuration — How It Installs

The A20B-2900-0310 installs as a daughter board — it plugs into or attaches to the main graphic control board within the CNC control unit. The daughter board architecture separates the graphics logic from the main CNC processing board. This separation means a graphics module failure does not affect the CNC's motion control or programme execution — the CNC continues to run even if the display loses graphics capability.

Conversely, loss of graphics functions — blank display areas, missing graphical elements, corrupted graphic rendering — without affecting CNC programme execution often points to the A20B-2900-0310 as the failed component, not the main CNC board.

Application Scenarios

Graphic display fault on Series 16 machining centre: A FANUC Series 16 machining centre's operator display loses the tool path graphic display. The programme page and parameter pages display normally. The fault is isolated to the graphic control module — the A20B-2900-0310 replacement restores full graphic display capability.

CNC maintenance refresh: During a scheduled CNC maintenance overhaul on an older Series 18 turning centre, the graphic control module is replaced as part of a board-level renewal programme to prevent age-related graphics failures on high-hours equipment.

FAQ

Q1: Does replacing the A20B-2900-0310 require any software configuration?

The graphic control module is a hardware board. In most Series 16 and 18 configurations, the module does not carry CNC parameters or programmable settings. Replacing the board restores graphics hardware capability without requiring screen configuration or parameter changes. The CNC's graphic parameter settings (screen type, display resolution options) are held in the main CNC parameter memory, not in the daughter board.

Q2: Can a failed A20B-2900-0310 cause the CNC to stop running?

In most cases, no. The CNC's motion control, programme execution, and I/O functions are handled by boards separate from the graphics module. A graphic board failure typically causes display anomalies — blank graphics areas, missing tool path display — while the machine continues to run. However, if the fault also corrupts power supply rails or bus signals shared with other boards, secondary effects on CNC operation are possible. Diagnose the specific fault before assuming the CNC will continue running with a failed graphics board.

Q3: What are the visible symptoms of A20B-2900-0310 failure?

Common symptoms include: the tool path graphic screen shows a blank or corrupted image while text pages display normally; specific graphic display modes trigger CNC alarms; the graphic display area shows partial or frozen rendering that does not update; or the screen shows graphic noise (random pixel patterns) in areas normally occupied by graphical content.

Q4: Is the A20B-2900-0310 compatible with Series 16M, 16T, 18M, and 18T variants?

The A20B-2900-0310 targets the Series 16 and 18 CNC family. Compatibility across the M (machining centre), T (turning centre), and other sub-variants within these series depends on the specific display board assembly into which the module plugs. Verify against the spare parts documentation for the specific CNC model and display unit type before ordering.

Q5: What adjacent part numbers serve different CNC generations in the graphic board family?

The A20B-2900 series covers graphic boards across multiple FANUC CNC generations. Adjacent numbers serve different systems — for example, A20B-2900-0340 and A20B-2900-0350 serve other display configurations within the FANUC family. Part numbers in the A20B-2901 and A20B-2902 sub-series cover newer-generation graphic modules. Each graphic board is system-specific — verify the installed board number directly from the label before ordering.