KFAS LLC confirms: "A20B-3300-0311 is commonly used in Fanuc 16iB, Fanuc 18iB series controls." The maintenance manual reference B-63525EN covers the 16i-B, 18i-B, and 21i-B platform — placing the A20B-3300-0311 within FANUC's second-generation (Model B) i-series CNC hardware.
The A20B-3300-0311 is the base Pentium CPU module for the 16i-B/18i-B platform — the processor card that executes the CNC system software from its on-board working memory. It represents the standard processor configuration that established the 031x-family CPU module generation for this platform.
| Parameter | Value |
|---|---|
| Compatible | Series 16i-B, 18i-B |
| Manual | B-63525EN (16i-B/18i-B/21i-B) |
| Type | Plug-in CPU module |
| Family | A20B-3300-031x |
| Series | A20B-3300 |
The 031x range established the Pentium-class CPU module generation for the FANUC i-series B platform. Confirmed variants serve different i-B series CNC models:
| Board | Platform | Notes |
|---|---|---|
| A20B-3300-0311 | 16i-B, 18i-B | Base Pentium module |
| A20B-3300-0312 | 21i-B, 210i-SB | Pentium 16MB |
| A20B-3300-0313 | 0i-C | Pentium 32MB SDRAM |
| A20B-3300-0317 | 16i-B, 18i-B | TORNOZ 166MHz variant |
| A20B-3300-0319 | 21i-B, 0i-B | Pentium 32MB |
The 031x family served the full i-B generation across multiple CNC platforms — each variant matched to its specific CNC's main board socket and software requirements.
16i-B CPU module fault: A FANUC Series 16i-B machining centre develops CNC boot failures. The A20B-3300-0311 is identified as the fault. Replacement restores the CNC processing function.
18i-B CNC controller maintenance: A Series 18i-B turning centre undergoes planned electronics maintenance. The A20B-3300-0311 is replaced as part of a comprehensive CPU module renewal.
Q1: Is A20B-3300-0311 specific to 16i-B/18i-B or also used in 21i-B?
Whether 0311 is directly compatible in a 21i-B slot depends on the specific main board configuration — confirm from the hardware documentation.
Q2: What is the processor and memory specification of A20B-3300-0311?
The 031x family uses Pentium-class processors. The specific clock speed and DRAM capacity of A20B-3300-0311 are confirmed from the installed module's label and the Fanuc 16i-B/18i-B Maintenance Manual B-63525EN. Related 031x modules include: 0312 (16MB), 0313 (32MB SDRAM), and 0319 (32MB) — confirming the 031x family's memory range.
Q3: Does replacing A20B-3300-0311 affect CNC parameters or programmes?
No. CNC parameters and programmes reside in SRAM and FROM modules separate from the CPU module. Replacing A20B-3300-0311 does not affect stored data. After fitting the replacement, the CNC boots from FROM and reads parameters from SRAM automatically.
Q4: What main board types does A20B-3300-0311 plug into?
The Series 16i-B and 18i-B use multiple main board configurations — standalone cabinet-mount boards and LCD-integrated board assemblies. The A20B-3300-0311 plugs into the CPU module socket on the applicable main board for either configuration. Confirm the host main board type from the machine's hardware documentation.
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