1. Overview

• Type: Boot RAM / system firmware memory PCB

• Controller: XRC1000, XRC2001 (XRC series only)

• Function: Stores OS, firmware, boot loader, and system parameters

• Part number: JANCD-XMM02; common revision JANCD-XMM02-2 (no CNBT connector)

• Status: Obsolete; available as refurbished/used

2. Key Differences (XMM02 vs XMM01)

• XMM02: System/boot memory (OS/firmware), fixed size, not user-expandable

• XMM01: User program memory (4 MB CMOS), for jobs/programs, expandable

• Both: Installed together in XRC CPU rack (JZNC-XRK01B)

3. Specifications

• Memory: Boot RAM / firmware storage (non‑user, fixed capacity)

• Power: 24 VDC ±10% (20.4–28.8 VDC)

• Current: ~200 mA idle, ~1 A operating

• Operating temp: 0 °C ~ +40 °C

• Dimensions: ~100 × 100 × 25 mm

• Weight: ~40 g

4. LED Indicators

• PWR (green): 24 VDC OK

• BOOT (green): Firmware loading normal

• ALM (red): Boot error, firmware corruption, or bus fault

5. Compatibility & Installation

• Fits: XRC1000, XRC2001 (XRC series only)

• Requires: XRC CPU board JANCD-XCP01

• Installation: Same as XMM01; must install both XMM01 + XMM02 for full system operation

6. Common Issues

• Boot failure: Red ALM LED; usually caused by faulty XMM02 or corrupted firmware

• Not user‑replaceable firmware: Requires Yaskawa service to reload OS