2.1 General

• Part Number: 405A742G02

• Manufacturer: Westinghouse / Emerson

• Product Type: DCS Processor Module

• Compatible Systems: Ovation DCS, WDPF DCS (Multibus chassis: 405A675G / 405A685G series)

• Revision: G02 (enhanced production revision)

• Status: Obsolete (EOL)；available as NOS (New Old Stock) or certified refurbished

• Warranty: 12 months (refurbished)；24 months (NOS)

2.2 Electrical & Processing

• Processor: 32‑bit RISC, 200 MHz (vs. 150 MHz on G01)

• Memory: 128 MB RAM, 64 MB Flash (double G01 capacity)

• Backplane Interface: Multibus (32‑bit data, 24‑bit address)

• Communication Ports: Dual Ethernet (10/100 Mbps), RS‑232/485

• Real‑Time Clock: Battery‑backed, 10‑year retention

• Power Consumption: 18 W max (from backplane +5 VDC)

• Protection: Overvoltage, overcurrent, ESD, surge protection

2.3 Physical

• Form Factor: Standard 6U DCS module

• Dimensions (W×H×D): 305 mm × 203 mm × 25 mm (12.0 in × 8.0 in × 1.0 in)

• Weight: ≈ 1.42 kg (3.1 lb)

• Mounting: 12‑slot Multibus chassis

• Connectors: Multibus edge connector (backplane), RJ45 (Ethernet), DB9 (serial)

• Coating: Conformal coated (dust, moisture, corrosion resistance)

• Cooling: Forced air (chassis fan, 15–20 CFM required)

2.4 Environmental

• Operating Temperature: 0 °C to +60 °C (32 °F to 140 °F)

• Storage Temperature: −40 °C to +85 °C (−40 °F to 185 °F)

• Relative Humidity: 5% to 95% (non‑condensing)

• Shock/Vibration: IEC 60068‑2‑6 compliant (1 g, 10–150 Hz)

• MTBF: > 110,000 hours (25 °C, full load)

3. Main Features

1. Upgraded Processing & Memory

   • Faster 200 MHz processor and doubled RAM/Flash enable more complex control logic and larger data storage.

2. Dual Redundant Ethernet

   • Two independent Ethernet ports support network redundancy, preventing communication loss in case of single‑port failure.

3. Enhanced Diagnostics & Fault Logging

   • Extended fault code storage and real‑time monitoring; supports remote diagnostics via Ovation engineering tools.

4. Full Backward Compatibility

   • Direct replacement for 405A742G01; no chassis or software changes required during upgrade.

5. Hot‑Swap & Redundancy Support

   • Seamless online replacement in redundant Ovation/WDPF systems; no controller reboot needed.

6. Robust Industrial Design

   • Conformal coating, vibration resistance, and extended temperature range ensure reliability in harsh process environments.

4. Applications

• Power Generation: Thermal, nuclear, combined‑cycle plants (Ovation/WDPF DCS).

• Process Industries: Petrochemical, pulp & paper, cement, water treatment.

• DCS Upgrades: High‑performance replacement for aging G01 processors.

• High‑Availability Systems: Redundant processor configurations for 24/7 operation.

5. Installation Instructions

5.1 Pre‑Installation Safety

• ESD Protection: Always use an ESD wristband when handling the module.

• Power Off: Shut down the DCS chassis; disconnect AC input; wait 5 minutes for capacitors to discharge.

• Inspection: Check for bent pins, damaged connectors, or physical damage.

5.2 Installation Steps

1. Select Slot: Choose the dedicated processor slot (typically slot 1) in the Multibus chassis.

2. Insert Module: Align with chassis guides; insert firmly until fully seated in the backplane.

3. Secure Module: Tighten the front‑panel screw to ensure grounding and mechanical stability.

4. Connect Cables: Attach Ethernet cables to RJ45 ports; connect serial cable to DB9 if needed.

5. Power On: Reconnect AC power; verify LED status: PWR (Green) ON, RUN (Green) Blinking.

6. Configure Software: Use Ovation engineering tools to set network parameters and redundancy settings.

7. Test Communication: Verify connection with I/O modules and supervisory systems.

6. LED Indicators

• PWR (Green): ON = Backplane power present; OFF = No power or faulty backplane.

• RUN (Green): Blinking = Normal operation (heartbeat); ON Solid = Firmware update mode; OFF = Processor halt.

• COM (Yellow): Blinking = Ethernet activity; ON Solid = Link established; OFF = No link.

• FLT (Red): ON = Module fault (overtemperature, memory error, or communication failure); Blinking = Critical fault.

7. Maintenance & Troubleshooting

7.1 Preventive Maintenance (Quarterly)

• Visual Inspection: Check connectors for dirt, corrosion, or loose cables.

• Cleaning: Use dry, low‑pressure compressed air (≤ 2 bar) to clean vents and components.

• Firmware Update: Ensure latest firmware version via Ovation engineering tools.

• Redundancy Test: Verify failover operation between primary and redundant processors.

7.2 Troubleshooting

• PWR LED OFF: Check backplane power supply (405A720H series); verify chassis circuit breaker.

• RUN LED OFF:

  1. Power cycle the chassis to reset the processor.

  2. Check for corrupted firmware; reflash if necessary.

  3. Replace module if fault persists.

• COM LED OFF: Verify Ethernet cable connection; check network switch port; review IP configuration.

• FLT LED ON:

  1. Check chassis airflow and fans for proper cooling.

  2. Review fault logs for specific error codes.

  3. Replace module if fault persists after power cycle.

8. Storage & Handling

• Packaging: Store in original anti‑static bag; keep in cool, dry, dust‑free area.

• Temperature: −40 °C to +85 °C; avoid direct sunlight and heat sources.

• Handling: Hold module by edges only; avoid touching components or connectors.

• Transport: Use shock‑absorbent packaging; avoid heavy vibration during shipping.

9. Disclaimer