1. General Description

2. Basic Information

• Model: JANCD‑MM20

• Alternate P/N: DF8203490‑A0

• Manufacturer: Yaskawa Electric (Japan)

• Type: Volatile CMOS RAM memory board

• Applicable Systems: Yasnac PK1 CNC, Motoman ERC/XRC robots (certain configs)

• Revision: Rev B0, B11

• Weight: ~1.0 kg (2.2 lbs)

• Status: Discontinued / Obsolete

3. Technical Specifications

• Memory: 256 KB CMOS RAM (volatile)

• Interface: Proprietary parallel bus (PK1/ERC backplane)

• Power: 5 VDC (backplane supplied)

• Operating Temp: 0 °C to +50 °C

• Storage Temp: −20 °C to +70 °C

• Humidity: 5%–80% RH (non‑condensing)

• Protection: IP20 (metallic enclosure)

• LED: Power/access indicator

4. Key Functions

• Stores CNC/robot user programs, job data, motion parameters, offset data, I/O buffers.

• Works with system ROM/flash boards for firmware; retains runtime data during power‑on.

• Supports online editing, program execution, high‑speed data buffering.

• Used in Yasnac PK1 CNC and select Motoman ERC/XRC controller setups.

5. Compatibility

• Fits: Yasnac PK1 CNC, Motoman ERC/XRC (specific versions)

• Not compatible with MM14/MM15 series, MRC/MX2/DX robot controllers, or non‑Yaskawa systems.

6. Installation & Safety

• Power off controller completely before insertion/removal (no hot swap).

• Use grounded ESD wristband to prevent static damage.

• Align edge connector, seat firmly in slot, tighten screws for vibration resistance.

• Keep dry, dust‑free; avoid oil, shock, or impact. Do not disassemble.