1. General Information

• Part Number: JANCD-SR02 (also marked DE8401380-02, Rev. D/E)

• Manufacturer: Yaskawa Electric / Motoman Robotics

• Type: Main CPU / System Control Board (enhanced version of JANCD-SR01)

• Function: System boot, CNC/robot OS execution, motion planning, axis control, I/O and bus management

• Applicable Systems:

  • YASNAC LX / MX series CNC (late revision)

  • Motoman ERC robot controllers (mainstream version)

• Status: Discontinued (obsolete; only used / refurbished available)

• Weight: Approx. 1.0–1.2 kg

• Form Factor: Standard Yaskawa backplane plug-in card (compatible slot with SR01)

2. Specifications

Electrical

• Power Supply: +5 V, ±12 V DC (from system backplane)

• Power Consumption: ~1.8 A max (higher than SR01)

• Processor: Enhanced 16-bit CPU (higher clock speed than SR01)

• On-board Memory:

  • ROM: 256 KB (firmware storage)

  • RAM: 128 KB (system/workspace, expanded vs SR01)

• Watchdog: On-board hardware watchdog for system reset

Environmental

• Operating Temperature: 0 °C to +45 °C

• Storage Temperature: -20 °C to +60 °C

• Humidity: 5%–85%, non-condensing

3. Key Functions (Enhanced vs SR01)

1. High-Performance System Processing

   Faster CNC/robot program interpretation, motion planning and logic execution; supports more complex machining/robot tasks.
2. Multi-Axis Motion Control

   Coordinates up to 8 servo axes (vs 6 axes on SR01); supports linear/circular interpolation and axis synchronization.
3. Expanded I/O & Bus Capacity

   • Controls up to 256 digital I/O points (expanded)

   • Supports Genius bus and high-speed serial communication

   • Enhanced interface with JANCD-SP series display boards

4. Improved Alarm & Diagnostics

   More detailed fault codes, real-time system monitoring and error logging; easier troubleshooting.
5. Firmware Compatibility

   Backward compatible with SR01-based systems; supports updated CNC/robot firmware versions.

4. Compatibility

Compatible With

• YASNAC LX / MX CNC systems (all revisions)

• Motoman ERC robot controllers (all firmware versions)

• JANCD-SP17B / SP20 / SP21 display/interface boards

• JANCD-SR01 (pin-to-pin compatible, direct replacement)

Incompatible With

• XRC, NX100, DX, YRC series Motoman robot controllers

• JANCD-SR21 / SR30 and other later CPU boards

5. Installation & Maintenance

Installation

1. Power off the controller and wait ≥5 minutes for capacitor discharge.

2. Wear anti-static wrist strap to avoid ESD damage.

3. Align with the designated backplane slot, insert firmly and tighten screws.

4. Reconnect all cables (power, communication, I/O) and power on.

Troubleshooting

• No boot / dead board: Check +5 V power, reseat board, clean gold-plated connectors.

• System hang-up: Verify firmware version; check for RAM/ROM failure.

• Motion errors: Inspect servo bus cables; check axis parameter settings.

• Communication failure: Clean backplane connectors; reseat adjacent I/O boards.

Safety Notes

• Always power off before removal/installation.

• Strict anti-static handling required.

• Keep board clean, dry and away from corrosive gas/oil mist.