1 PC Used Fanuc A17B-3300-0403 Board In Good Condition A17B33000403 A17B-33OO-O4O3

FANUC A17B-3300-0403 | NURBUS CPU Module — A17B-3300 Series

NURBUS CPU — Communications Processing in the A17B-3300 Family

The A17B-3300-0403 is the NURBUS CPU module from FANUC's A17B-3300 series. Within this series, different module variants handle different control functions — the 6-axis and 8-axis hi-speed servo modules handle FSSB servo communication, while the NURBUS CPU module handles the NURBUS communications bus processing. The NURBUS is a FANUC-specific bus architecture that manages network and inter-system communication within the controller, separate from the servo motion control path.

As a CPU module, the A17B-3300-0403 is a processing board — it runs the NURBUS communication protocol, manages the bus topology, and handles data transfer between connected system elements. When this module fails, the controller loses NURBUS communications functionality. The specific impact depends on which functions in the installed system depend on the NURBUS path.

The A17B-3300 series modules are plug-in cards designed to install horizontally on the main controller host PCB. The A17B-3300-0403 coexists on the same host board with other A17B-3300 modules (servo control cards) and A20B-3300 memory modules.

Key Specifications

Exact Part Number Confirmation Required

The A17B-3300 series contains multiple CPU and control module variants with different communication functions. Adjacent suffixes in the series serve entirely different roles. The A17B-3300-0403 NURBUS CPU is not interchangeable with servo control or other CPU modules in the same series without confirming compatibility with the installed controller's architecture. Confirm the installed module's label reads A17B-3300-0403 before ordering a replacement.

FAQ

Q1: What is NURBUS and what does this CPU module do?

NURBUS is a FANUC-specific communication bus architecture used in certain FANUC CNC and robot controller platforms. The A17B-3300-0403 is the CPU module that processes NURBUS communications — it manages the NURBUS data path within the controller, handling inter-system data transfer via this bus. Loss of the module causes failure of the communications functions that depend on the NURBUS path.

Q2: How does the A17B-3300-0403 fit into the overall A17B-3300 module family?

The A17B-3300 series covers several distinct plug-in module types for FANUC controller systems. The -0200 and -0201 variants are axis servo control cards; the -0403 is the NURBUS CPU module with a different, independent communications function. These modules coexist on the same host PCB but serve different functions. Identifying the specific variant by suffix is essential for correct replacement.

Q3: Does replacing the A17B-3300-0403 require data backup?

The communications bus configuration and related parameters are typically stored in the controller's main memory modules (SRAM), not in this CPU card. However, confirm the specific controller architecture before assuming data is preserved. Always maintain a current backup of all controller parameters and programmes before replacing any control board.

Q4: What are the symptoms of a failed A17B-3300-0403?

Failure of this module typically produces communication alarms or error codes related to the NURBUS bus path. The specific alarm codes depend on the controller model. The servo axes and other controller functions that do not depend on NURBUS may continue to operate normally. Compare the alarm codes against the controller's maintenance manual to confirm NURBUS as the fault location before ordering this module.

Q5: Where is the A17B-3300-0403 sourced?

Through the FANUC A17B-3300 module aftermarket — FANUC controller PCB specialists and industrial automation parts dealers. Confirm the exact suffix A17B-3300-0403 from the installed board label. The A17B-3300 series has multiple variants; the part number suffix is the only reliable identification.