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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-8200-0360 |
The A20B-8200-0360 is the 4-axis servo control module for FANUC's 0i-C CNC platform — the PCB that handles servo axis command output and feedback processing for up to four controlled axes within the 0i-C control unit. In the 0i-C's internal architecture, this module sits between the main CPU board and the servo amplifier system: it processes axis movement commands from the CNC interpolation stage and manages the servo communication interface to the drive system.
The 4-axis designation defines the module's functional capacity and is the primary compatibility checkpoint for replacement. A different servo module with a different axis count — such as a 2-axis or 3-axis variant within the same A20B-8200 family — serves a different position in the control's axis architecture and cannot substitute without CNC configuration changes. Confirm the installed module specifies 4-axis from its label before sourcing a replacement.
| Parameter | Value |
|---|---|
| Part Number | A20B-8200-0360 |
| Series | A20B-8200 |
| Axis Count | 4 |
| Compatible CNC | FANUC 0i-C |
| Type | Servo control PCB |
| Origin | Japan |
The FANUC 0i-C was FANUC's compact CNC platform for the generation that introduced full digital servo with FSSB communication in a cost-effective package for small-to-medium CNC machine tools. The 0i-C control hardware is still found in a large number of active CNC lathes, machining centres, and mill-turn machines manufactured through the 2000s and early 2010s.
When the servo control module in an 0i-C develops a fault, the affected axes lose control — the CNC typically generates servo communication or FSSB alarms across the axes that route through this module.
Service listings for the A20B-8200-0360 note that firmware or series selection may be relevant for replacement. The module may carry firmware that is specific to the 0i-C platform revision or axis configuration. Before fitting a replacement, confirm with the supplier that the module's firmware is compatible with the specific 0i-C control version installed in the machine.
This is especially relevant if the machine has undergone a software update since original build.
Q1: What does the 4-axis designation mean in practice?
It means this module controls the servo communication for four machine axes simultaneously. On a typical 0i-C machining centre, these four axes correspond to X, Y, Z, and a fourth axis (such as a fourth linear or rotary axis). The module handles axis command distribution and position feedback processing for all four simultaneously. A different axis-count variant of the A20B-8200 series is not a substitute without CNC axis configuration changes.
Q2: What symptoms indicate this module has failed?
Servo or FSSB communication alarms affecting multiple axes simultaneously — particularly all four axes that route through this module — is the characteristic failure pattern. If a single axis faults while others remain normal, the fault is more likely in the specific axis's amplifier, motor, or encoder cable. Loss of all four axes simultaneously at power-up, without wiring faults, points to the servo control module.
Q3: Does replacing the A20B-8200-0360 require CNC parameter changes?
For a like-for-like 4-axis replacement with matching firmware, no axis parameter changes are typically required — servo parameters and motor type settings are stored in the CNC's SRAM memory and are unaffected by the module swap. If the replacement carries a different firmware revision, additional commissioning steps may be needed. Verify firmware compatibility with the supplier before installation.
Q4: Can A20B-8200 variants with different axis counts be used as substitutes?
No. The A20B-8200 family includes servo control modules with different axis capacities for different 0i-C configurations. Substituting a module with a different axis count changes the control's axis routing and requires CNC axis parameter reconfiguration — it is not a direct replacement. Always match the 4-axis specification and confirm the full part number A20B-8200-0360.
Q5: Where is the A20B-8200-0360 sourced?
Through the FANUC 0i-C CNC aftermarket — 0i-C servo module specialists and FANUC CNC parts dealers. Confirm the full part number and ask the supplier to verify firmware compatibility with the specific 0i-C revision in the machine. ESD-safe handling is required during installation.
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