A20B-3300-0470 Fanuc PCB Board A20B33000470 A2OB-33OO-O47O

A20B-3300-0470 | FANUC B2 Pentium CPU Module — 64MB DRAM / Series 16i-B and 18i-B / Predecessor to B3 / 0–60°C

B2 — The 64MB Pentium CPU for Series 16i-B/18i-B

DNC Electronics confirms the A20B-3300-0470: "B2 Processor + DRAM Module Series 16i and 18i Controls. Pentium CPU with 64MB DRAM model B. Fitted upon later model B generation of series 16i and 18i controls."

The A20B-3300-0470 (B2, 64MB) and A20B-3300-0471 (B3, 128MB) are the two CPU module options for the FANUC Series 16i-B and 18i-B platforms:

The B2 (0470) at 64MB bridges between the Pentium MMX generation's 16MB and the B3's 128MB — providing substantial working memory headroom for the 16i-B and 18i-B without the maximum 128MB capacity of the B3 generation.

Key Specifications

64MB DRAM — Practical Working Memory

The B2 module's 64MB DRAM provides ample working memory for standard to moderately complex 16i-B/18i-B CNC configurations:

Standard software option sets: The most commonly installed 16i-B/18i-B options — rigid tapping, AICC, 5-axis transformations, servo tuning — run comfortably within the 64MB working memory allocation.

Typical programme complexity: G-code programmes for typical machining centre and turning centre applications execute from 64MB without memory constraints on look-ahead depth or execution speed.

Display and system functions: The CNC's display management, diagnostic functions, and serial communication all operate within 64MB for standard system configurations.

For the most heavily-optioned 16i-B systems, the B3 module (0471) at 128MB provides additional headroom — but the B2 at 64MB is the correct specification for the system configurations that use it.

Application Scenarios

16i-B CNC B2 CPU fault: A FANUC Series 16i-B CNC with a B2 CPU module develops processor-level failures. The A20B-3300-0470 is identified. Replacement restores the 64MB processing capability.

18i-B standalone module replacement: A Series 18i-B CNC with an A20B-3200-042x standalone main board requires B2 CPU module replacement. The A20B-3300-0470 is the confirmed replacement.

FAQ

Q1: What is the difference between B2 (A20B-3300-0470, 64MB) and B3 (A20B-3300-0471, 128MB)?

Both serve the Series 16i-B/18i-B platform with Pentium-class processing. The B3 provides 128MB DRAM — twice the working memory of the B2's 64MB. The B3 supports more heavily-optioned 16i-B/18i-B configurations and also serves the 21i-B (0471 is confirmed for 16i-B, 18i-B, and 21i-B). The B2 is specifically the 64MB module for 16i-B and 18i-B without the extended memory of the B3.

Q2: Is A20B-3300-0470 (B2) a suitable replacement for the earlier Pentium MMX module A20B-3300-0600?

Both A20B-3300-0600 (Pentium MMX, 16MB) and A20B-3300-0470 (B2, 64MB) serve Series 16i-B/18i-B. Whether the 0470 can directly plug in where the 0600 was fitted depends on the main board socket specification. Confirm from the applicable hardware documentation before substituting.

Q3: Does replacing A20B-3300-0470 affect CNC parameters or programmes?

No. CNC parameters and programmes reside in SRAM and FROM modules separate from the CPU card. Replacing A20B-3300-0470 does not affect stored data. After fitting the replacement, the CNC boots from FROM and reads parameters from SRAM normally.

Q4: Can A20B-3300-0470 be fitted in a main board designed for B3 (A20B-3300-0471)?

The B2 and B3 are different capacity modules for the same platform. Whether a B2 module is compatible in a main board socket that supports the B3 depends on the memory interface specification — a B2 may function correctly but only provide 64MB working memory rather than 128MB. Confirm from the FANUC 16i-B hardware documentation before fitting a lower-capacity module as a substitute.