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The 9905-969 is a rugged LinkNet 6-Channel Analog Input Module developed by Woodward, Inc. for high-accuracy data acquisition in turbine and engine control systems. It functions as a distributed I/O node, converting field...
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The 9905-969 is a rugged LinkNet 6-Channel Analog Input Module developed by Woodward, Inc. for high-accuracy data acquisition in turbine and engine control systems. It functions as a distributed I/O node, converting field analog signals (temperature, pressure, flow) into digital data transmitted over the LinkNet network to the main controller.
By digitizing signals close to the source, the 9905-969 reduces field wiring complexity, improves noise immunity, and enhances overall signal integrity. It is widely deployed in gas and steam turbine control panels where reliable analog monitoring is essential.
The module includes a 2-line × 24-character LCD display and a 30-key multifunction keypad, enabling local diagnostics, monitoring, and address configuration without external tools. High dielectric isolation (up to 500 VDC between power and I/O) prevents field faults from propagating to the control network, ensuring system stability in harsh industrial environments.
Designed for extreme conditions, the 9905-969 supports wide temperature and humidity ranges, making it suitable for power generation, marine propulsion, and heavy industrial applications.
| Parameter | Specification |
|---|---|
| Model | 9905-969 |
| I/O Channels | 6 isolated analog inputs |
| Network Protocol | LinkNet Distributed I/O |
| Input Power | 18–32 V DC (Nominal 24 V DC @ 1 A) |
| Local Interface | 2-line × 24-character LCD + 30-key keypad |
| Measurement Accuracy | ±1% full scale at 25°C |
| Isolation (I/O to Network) | 277 V AC |
| Isolation (Power to I/O) | 500 V DC |
| Operating Temperature | -40°C to +55°C |
| Dimensions | 14" W × 11" H × 4" D |
| Weight | 0.13 kg |
The 9905-969 is commonly used in:
Gas turbine control systems
Steam turbine monitoring panels
Marine propulsion control cabinets
Industrial engine management systems
Typical field inputs include:
4–20 mA transmitters
0–5 V DC analog sensors
Thermocouples (via appropriate signal conditioning)
Pressure and flow transducers
Its local display allows maintenance personnel to quickly verify sensor status and system diagnostics directly at the panel.
Q1: Does the module support 4–20 mA inputs?
Yes. The six analog channels are configurable for standard industrial signal ranges such as 4–20 mA and 0–5 V DC (configuration via Woodward control software).
Q2: Is the module hot-swappable?
It is recommended to isolate or power down the 24 V DC supply before removal to avoid communication disturbances on the LinkNet bus.
Q3: Can the keypad perform calibration?
The keypad is primarily used for monitoring, addressing, and diagnostics. Calibration is typically performed through the master controller engineering workstation (e.g., GAP or MicroNet systems).
