1. Product Overview

2. Basic Information

• Model Number: 405A924G05

• Brand: Westinghouse / Emerson

• Product Type: DCS Central Control & Communication Module

• Applicable System: Ovation DCS, WDPF DCS

• Origin: United States

• Net Weight: Approx. 1.4 kg

• Form Factor: Standard Ovation/WDPF card module

• Warranty: 12 months for new and refurbished products

• Certification: Factory tested, compliant with industrial EMC standards

3. Main Functions

1. Execute real-time control logic, PID regulation and interlock protection for field process loops.

2. Collect, process and transmit analog and digital I/O data through the system backplane bus.

3. Establish high-speed communication between controllers, HMI workstations and engineering stations.

4. Support 1:1 hot standby redundancy and bumpless switchover to avoid system outage.

5. Store system configuration, operating parameters and firmware in non-volatile memory.

6. Provide on-board LED indicators and built-in diagnostic functions for fast fault locating.

7. Optimize signal buffering and transmission to adapt to complex electromagnetic environments.

4. Technical Specifications

4.1 Electrical Parameters

• Power Supply: 24 VDC (standard DCS power)

• Power Consumption: 17 ~ 24 W during normal operation

• Insulation Strength: 1500 VDC isolation between field circuit and internal circuit

• Protection: Overvoltage, overcurrent and ESD protection

4.2 Communication & Interface

• Backplane Bus: Ovation/WDPF proprietary high-speed bus

• External Interface: Dedicated communication ports for MMI and network connection

• Transmission Media: Shielded twisted pair cable

• Bus Protocol: Exclusive DCS communication protocol

4.3 Environmental Specifications

• Operating Temperature: 0 °C to +55 °C

• Storage Temperature: -25 °C to +70 °C

• Relative Humidity: 5% ~ 95%, non-condensing

• Vibration Resistance: Industrial grade, meets IEC 61508 requirements

4.4 Mechanical Features

• Mounting: Slide-in type, locked by front panel buckle

• Cooling Mode: Natural convection cooling

• Coating: Conformal coating for dust and moisture resistance

5. Compatibility & Replacement

• Compatible Models: Direct replacement for 405A924G03, 405A924G04, full pin and function compatibility.

• Firmware Adaptation: Compatible with all mainstream firmware versions of Ovation and WDPF systems, including old and new releases.

• Upgrade Advantage: Updated hardware components, lower failure rate and longer service life compared with earlier versions.

6. Application Industries

• Power generation: Thermal power, combined cycle power plants and nuclear power plants

• Petrochemical: Refineries, natural gas processing and chemical production plants

• Heavy industry: Pulp & paper, mining, cement and metallurgical factories

• Environmental protection: Large-scale water supply and wastewater treatment facilities

7. LED Indicator Definition

• PWR (Green): Power supply normal

• RUN (Flashing Green): Module running normally

• FAULT (Red): Hardware or software fault detected

• COM (Amber): Data communication in progress

• REDUND (Blue): Redundancy function activated

8. Installation & Safety Instructions

1. Cut off the power of the DCS cabinet before installing or removing the module.

2. Take ESD protection measures, wear anti-static wristband during operation.

3. Align the module with the cabinet slot, insert steadily until the buckle is fully locked.

4. Connect all communication cables and power cables strictly according to wiring diagrams. Ensure good shielding and grounding.

5. Restore power after installation, check all LED status to confirm normal operation.

6. It is recommended to use redundant configuration for key control loops. Hot swap is allowed under redundant mode.

9. Daily Maintenance & Troubleshooting

1. Regularly check module status indicators, cables and connectors, keep the cabinet clean and ventilated.

2. If the FAULT light is on, use the engineering station to run system diagnostics and troubleshoot faults.

3. Do not disassemble the module privately; use only Emerson certified spare parts for replacement.

4. Match the firmware version with the existing system before firmware update.

10. Ordering Information

• Part Number: 405A924G05

• Product Category: DCS Spare Parts > Ovation/WDPF Series > Control & Communication Modules

• Stock Status: New original stock and fully tested refurbished units available

• Lead Time: 1 - 3 working days for in-stock items; 2 - 4 weeks for out-of-stock orders

• Reminder: Please provide system model and firmware version when placing orders for compatibility confirmation.