Description
📌 ** — Part Description**
FANUC A20B‑3300‑0313 (used here as a reference for the A20B‑3300‑0313 family) is a CPU / main processor board used in FANUC CNC controllers — and A20B‑3300‑0313 is the closest documented part in the same 3300 series. Based on this family and official FANUC hardware tables, A20B‑3300‑0313 (and by extension similar 3300‑series CPU cards such as A20B‑3300‑0310 / 0311 / 0312) share the same role in the control system.
🧠 What A20B‑3300‑0313 / 3300‑series CPU Cards Are
-
Category: CPU Processor Module (main logic board for industrial CNC control)
-
Series: FANUC A20B‑3300 (control processor family)
-
Function: Acts as the main CPU card — the central processor that runs the CNC controller’s core operating software and logic.
In early FANUC hardware documentation this family includes CPU boards with different memory/configuration variants:
-
A20B‑3300‑0310 / A20B‑3300‑0311: CPU with DRAM memory.
-
A20B‑3300‑0291 / A20B‑3300‑0290: Earlier 486 CPU boards.
-
A20B‑3300‑0313: A CPU board with 32 MB DRAM and Pentium class processor used on specific FANUC controllers such as 0i‑C.
📋 Typical Function
This part is an essential processor (CPU) module inside the CNC controller cabinet. It performs the following:
-
Executes CNC firmware & logic — machine motion control, program processing, and internal logic.
-
Coordinates communications with display boards, input panels, axes control cards, and I/O interfaces.
-
Interfaces memory modules (DRAM/SRAM) and maintains system state during operation.
-
Often paired with other boards in the cabinet such as power supply modules and axis controllers.