A20B-3300-0445 Fanuc PCB Board A20B33000445 A2OB-33OO-O445

A20B-3300-0445 | FANUC FSSB 1-Path 4-Axis Servo Module B11 — Single-Path Servo Expansion / Standard Axis Config / A20B-3300 Series

1-Path 4-Axis — The Compact Standard Module

The A20B-3300-0445 is the compact end of the 044x servo module family — 1-path control and 4 servo axes. While the B24 (16-axis, 2-path) and B26 (2-path) modules serve complex multi-path CNC systems, the B11 serves the most fundamental CNC axis configuration.

Four axes on a single FSSB path covers the full range of standard CNC machine tool configurations: 3-axis machining centre: X, Y, Z as the three principal linear axes, plus a fourth axis for tool magazine positioning or a rotary table — 4 axes total. The most common vertical machining centre configuration worldwide. 4-axis CNC lathe: Z, X, C-axis (spindle orientation for milling operations), and a Y-axis or tool magazine index — 4 axes total for a capable CNC turning centre. 3-axis CNC machine with 1 auxiliary servo: A grinding machine, wire EDM, or special-purpose CNC with 3 machining axes plus one servo-controlled auxiliary function.

Key Specifications

A20B-3300-044x Family — Choosing the Right Module

The three A20B-3300-044x FSSB servo modules serve fundamentally different machine complexity levels:

The B11 (0445) serves the single-path, lower-axis machines that represent the majority of the CNC machine tool population. Most machining centres and turning centres in 

Application Scenarios

30i CNC 4-axis machining centre servo fault: A FANUC 30i machining centre with X, Y, Z, and rotary table (4 axes) develops FSSB servo alarms. The A20B-3300-0445 is identified as the fault. Replacement restores all 4-axis FSSB communication.

Single-path CNC servo module maintenance: A FANUC CNC using the 1-path 4-axis B11 module undergoes control maintenance. The A20B-3300-0445 is replaced as part of the servo module renewal.

FAQ

Q1: Can A20B-3300-0445 (B11, 4 axes) be used as a starting point and expanded to more axes later?

The B11 module itself is a fixed 4-axis configuration. Expanding to more axes requires fitting a higher-capacity module (B24, B26) or adding a second servo module. The CNC platform's total axis capacity is ultimately limited by the main board specification and installed software options — confirm the expansion path from the FANUC 30i/31i/32i hardware documentation.

Q2: Is A20B-3300-0445 suitable for FANUC 30i 5-axis CNC applications?

5-axis simultaneous machining requires 5 servo axes. The B11 module provides 4 axes. For a 5-axis configuration, a module with 5 or more axis capacity is needed (the B24 at 16 axes, or a combination of modules). Confirm the axis requirement from the machine specification before selecting the servo module.

Q3: Does A20B-3300-0445 support HRV3 servo control?

FSSB servo modules in the A20B-3300-044x family support the servo control modes available on the FANUC 30i platform. Whether HRV3 is active for the axes served by A20B-3300-0445 depends on the servo parameter settings and the servo drive hardware connected to this module. HRV3 capability is confirmed in the FANUC 30i servo parameter documentation.

Q4: Does replacing A20B-3300-0445 require servo parameter changes?

No. All servo parameters for the 4 axes reside in the CNC's main SRAM. After fitting the replacement, the CNC reloads parameters automatically. Verify servo response at low speed on all 4 axes before returning to production.

Q5: Is A20B-3300-0445 also used in robot controller applications?

The A20B-3300-044x modules serve the FANUC 30i/31i/32i and R-30i platforms. The R-30i robot controller is within the confirmed application range for these FSSB servo modules. Whether A20B-3300-0445 (B11, 1-path, 4 axes) is specified for R-30i applications with 4 joint axes is confirmed from the R-30i hardware documentation.