1. General Description

2. Basic Information

• Model: JANCD-MMM04

• Manufacturer: Yaskawa Electric (Japan)

• Type: RAM memory expansion PCB

• Compatible systems: Motoman XRC, MRC series (Yasnac CNC)

• Revision: D2 (common)

• Weight: ~1.4 kg (3 lb)

• Mounting: Dedicated CPU board slot (no backplane)

3. Technical Specifications

• Memory: High‑density SRAM/DRAM (larger than MMM01/MMM02)

• Interface: XRC/MRC proprietary parallel bus (plugs into CPU board JANCD-MCP02‑1)

• Power: 5 VDC (from controller internal supply)

• Operating temperature: 0 °C to +40 °C

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

• Data retention: Volatile (no battery); data lost on power‑off

4. Key Functions

• Expands system memory for longer programs, more jobs, and larger I/O data.

• Stores motion parameters, tool data, system logs, and backup buffers.

• Works with CPU board JANCD-MCP02‑1 in XRC/MRC controllers.

• Faster access than older MMM01/MMM02 boards for complex tasks.

5. Compatibility

• Fits: Motoman XRC, MRC series (XRC platform, Yasnac CNC).

• Does not fit: MM14/MM15/MM20/MM21, DX/FS series, or non‑Yaskawa systems.

6. Installation & Safety

• Power off and lockout controller before installation (no hot swap).

• Use ESD wristband; board is static‑sensitive.

• Insert into dedicated CPU board slot, align connectors, seat firmly.

• Keep dry, dust‑free; avoid shock, vibration, and corrosive gases.

7. MMM04 vs MMM01 / MMM02 (Quick Compare)

• MMM04: XRC/MRC, high‑capacity RAM, user data/programs, no battery.

• MMM02: XRC/MRC, EPROM+RAM, firmware + user data, no battery.

• MMM01: XRC/MRC, standard DRAM, basic expansion, no battery.