A20B-3300-0319 Fanuc PCB Board A20B33000319 A2OB-33OO-O3I9

A20B-3300-0319 | FANUC Series 21i-B and 0i-B Pentium CPU Module — 32MB DRAM / Dual-Platform Processor Card / A20B-3300-031x Family

One Module, Two CNC Platforms

The A20B-3300-0319 is confirmed for BOTH the Series 21i-B and the Series 0i-B — the "21/0 i B" designation explicitly identifies dual platform compatibility. This is unusual and worth understanding:

Series 21i-B: The Series 21i is the mid-to-high range in FANUC's i-series lineup — supporting complex machining and turning configurations with more axes and more advanced CNC options than the 0i-B.

Series 0i-B: The Series 0i is the economy-tier CNC — designed for standard machining and turning centres where cost efficiency is a priority alongside reliable CNC performance.

The fact that both platforms share the same CPU module (A20B-3300-0319) indicates a common processor architecture — different CNC software running on the same hardware, with software options and configuration determining the CNC's functional capability level.

Key Specifications

32MB DRAM — The 031x Family's Higher-Memory Configuration

Within the A20B-3300-031x Pentium module family, different DRAM configurations serve different platform requirements:

The A20B-3300-0319 at 32MB provides twice the working memory of A20B-3300-0312 (16MB for 21i-B/210i-SB). This additional DRAM supports:

Greater software option density: The 21i-B platform with advanced options — 5-axis coordinate transformation, AICC contouring, multi-spindle, and tool management — occupies more DRAM than the standard 21i-B configuration. 32MB provides headroom for these advanced configurations.

0i-B software evolution: As FANUC's 0i-B software added features and expanded its option set, 32MB ensured sufficient working memory for the growing software footprint.

Application Scenarios

21i-B CNC CPU module fault: A FANUC Series 21i-B machining centre with the 32MB CPU module develops a processor fault. The A20B-3300-0319 is identified and replaced. Processing is restored.

0i-B CNC module replacement: A Series 0i-B CNC turning centre requires CPU module replacement. The A20B-3300-0319 is confirmed from the installed module label. Replacement restores 0i-B CNC function.

FAQ

Q1: Is A20B-3300-0319 interchangeable between 21i-B and 0i-B CNC systems?

The module is confirmed compatible with both platforms — meaning it can function in either CNC's main board socket. However, whether moving a module from a 0i-B machine to a 21i-B (or vice versa) is a supported maintenance action depends on whether the main board sockets are identical. The module hardware is the same; the CNC software loaded from FROM determines the CNC's behaviour.

Q2: What distinguishes A20B-3300-0319 (32MB) from A20B-3300-0312 (16MB) for the 21i-B platform?

Both serve the 21i-B but with different DRAM. A20B-3300-0312 provides 16MB working memory; A20B-3300-0319 provides 32MB. The 32MB module accommodates more software options and more complex configurations. Whether a specific 21i-B CNC uses the 16MB or 32MB module depends on its software version and installed options — confirm from the machine's hardware configuration record.

Q3: Is A20B-3300-0319 the same as A20B-3300-0313 (32MB SDRAM for 0i-C)?

No. A20B-3300-0319 (32MB DRAM, 21i-B/0i-B) and A20B-3300-0313 (32MB SDRAM, 0i-C) are different modules. They have the same memory capacity but serve different platforms (0i-B vs 0i-C) and potentially use different memory technologies (DRAM vs SDRAM). They are not interchangeable.

Q4: Does replacing A20B-3300-0319 affect CNC parameters or programmes?

No. CNC parameters and programmes reside in SRAM and FROM modules. Replacing A20B-3300-0319 does not affect these stored values. After fitting the replacement, the CNC boots normally.