A20B-3300-0641 Fanuc PCB Board A20B33000641 A2OB-33OO-O64I

FANUC A20B-3300-0641 | Power Mate i 486X2 CPU Module — A20B-3300 Series / Compact CNC CPU Card

Power Mate i CPU — The Processing Core of FANUC's Compact Peripheral CNC

The A20B-3300-0641 is the CPU module card for FANUC's Power Mate i compact CNC controller. The Power Mate i is FANUC's standalone CNC for peripheral axis control, positioning applications, and machine peripherals where a full-scale i-series CNC is not required but precise closed-loop servo control is. Applications include robot positioners, pallet transport axes, rotary table indexers, and auxiliary axes on complex multi-function machines.

The "486X2" designation identifies the processor architecture — a 486-class CPU at double clock speed. This module provides the processing core for all Power Mate i CNC execution: axis interpolation, PMC ladder logic, servo command generation, and real-time control all run through this card. It plugs into the Power Mate i's main CPU board, providing the processor and associated logic.

Within the A20B-3300 series — which spans CPU modules across multiple FANUC CNC platforms — the -0641 specifically identifies the Power Mate i 486X2 variant. This is clearly distinct from A20B-3300-0601 (16iB/18iB CPU module) and other A20B-3300 variants serving different CNC systems. The part numbers are close; the functions are not interchangeable.

Key Specifications

Power Mate i — Host-Connected or Standalone CNC

The Power Mate i communicates with a host FANUC i-series CNC (16i, 18i, 21i) via the FANUC I/O Link. The host CNC issues high-level commands; the Power Mate i manages its own axis control programme independently. This distributed architecture allows complex machines to have more axes than the main CNC directly controls. Alternatively, the Power Mate i operates as a standalone controller for simple one- or two-axis applications without any host CNC.

FAQ

Q1: What FANUC CNC is the Power Mate i used with, and how does the A20B-3300-0641 fit in?

The Power Mate i connects to FANUC 16i, 18i, and 21i host CNCs via the I/O Link interface. The A20B-3300-0641 is the CPU card that provides the Power Mate i's processing core — without it, the controller cannot execute its axis control programme or communicate with the host CNC.

Q2: Does replacing the A20B-3300-0641 CPU module require programme reloading?

The CPU module carries the processor, not the programme storage. Programmes, parameters, and PMC data reside in the FROM and SRAM modules. If the FROM and SRAM modules are retained intact when only the CPU card is replaced, the Power Mate i should restore its configured operation on the next power-on. Confirm all data loads correctly at first startup after replacement.

Q3: How does A20B-3300-0641 differ from A20B-3300-0601?

The A20B-3300-0601 is the CPU module for Series 16iB/18iB CNC controls (32MB SDRAM). The A20B-3300-0641 is the CPU module for the Power Mate i (486X2 processor). These serve completely different FANUC CNC platforms and are not interchangeable in any configuration.

Q4: The Power Mate i fails to boot. Is the CPU module the likely cause?

If the Power Mate i shows no activity at power-on and the host CNC generates an I/O Link communication alarm for the Power Mate, first check the FROM and SRAM modules — corrupted FROM prevents boot. If FROM contents are confirmed intact (or restored from backup) and the controller still fails to start, the CPU module is the remaining suspect. Swap testing with a known-good A20B-3300-0641 is the definitive diagnostic.

Q5: Where is the A20B-3300-0641 sourced?

Through the FANUC Power Mate i aftermarket — FANUC CNC parts dealers, tested surplus suppliers, and repair services with Power Mate i experience. Confirm A20B-3300-0641 (Power Mate i 486X2 CPU) specifically from the installed card's label. The A20B-3300 series spans multiple CNC platforms — the exact -0641 suffix is the critical selection parameter.