1. Overview

2. Specifications

• Model: JANCD-FC120 (FC120-1: 64kB RAM; FC120-2: 128kB RAM)

• Manufacturer: Yaskawa Electric

• Part Number: DF8203846-B0 (FC120-1)

• System Compatibility: YASNAC I80, I80M

• Board Type: Expanded RAM / FILE Memory Board

• Memory Capacity:

  • FC120-1: 64kB (320m) Expanded RAM

  • FC120-2: 128kB Expanded RAM

• Memory Type: Non-volatile CMOS RAM (battery-backed)

• Backplane Compatibility: JANCD-FC001 / FC006 (I80 main backplane)

• Power: 5VDC ±5%, ~150mA (from backplane)

• Battery: On-board lithium battery (for memory retention)

• Operating Temp: 0°C to +55°C

• Dimensions: 267 mm × 152 mm (10.5" × 6")

• Weight: ~0.4 kg

3. Key Functions

• Program Memory Expansion: Adds 64kB / 128kB for storing large CNC part programs.

• User Data Storage: Expands capacity for tool offsets, work coordinates, and macro variables.

• High-Speed Access: Direct memory bus connection for fast program execution.

• Battery-Backed RAM: Retains programs/data during power outages.

• System Configuration: Enables advanced I80 features (e.g., 5-axis machining, complex macros).

• LED Status: On-board LEDs for power and battery status monitoring.

4. Compatibility

• Backplane: JANCD-FC001, JANCD-FC006 (I80 standard)

• CNC Controllers: YASNAC I80, I80M

• CPU Board: Works with I80 main CPU board (JANCD-FC002 or similar)

• Related Boards:

  • JANCD-FC100B/C: HIF Communication Board

  • JANCD-1021: Main I/O Board

  • JANCD-FC110: Slave I/O Board

5. Common Subtypes

• JANCD-FC120-1: 64kB RAM (standard expansion, most common)

• JANCD-FC120-2: 128kB RAM (high-capacity version for large programs)

6. Notes

• EOL Status: Discontinued by Yaskawa; supply limited to used/refurbished stock.

• Battery Replacement: On-board lithium battery has a 5–10 year lifespan; replace during refurbishment to prevent data loss.

• Configuration: Requires CNC parameter setup to recognize expanded memory.

• Identification: Labeled “FILE” or “RAM” on the board; check silkscreen for “JANCD-FC120”.