1. General Description

2. Basic Information

• Model: JANCD-MM20

• Alternate P/N: DF8203490‑A0

• Manufacturer: Yaskawa Electric (Japan)

• Type: Volatile CMOS RAM memory board

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

• Revisions: B0, B11

• Weight: approx. 1.0 kg

• Form factor: Standard 3U industrial board

3. Technical Specifications

• Memory: 256 KB CMOS RAM (volatile)

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

• Power: 5 VDC (supplied by backplane)

• Operating temperature: 0 °C to +50 °C

• Storage temperature: −20 °C to +70 °C

• Humidity: 5%–80% RH, non‑condensing

• LED: Power / access indicator

4. Key Functions

• Stores CNC user programs, robot jobs, motion parameters, tool offsets, I/O data.

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

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

• Used in Yasnac PK1 CNC and selected Motoman ERC/XRC controller configurations.

5. Compatibility

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

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

6. Installation & Safety

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

• Use a grounded ESD wristband to prevent static damage.

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

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