Woodward 9905-971 LinkNet Discrete Input Module Protocol Gateway
Manufacturer: Woodward
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Part Number: 9905-971 Rev(K)
Condition：New with Original Package
Product Type: Discrete Input Modules
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Country of Origin: GERMANY
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Woodward 9905-971 Rev(K) LinkNet Discrete Input Module and CANbus Protocol Gateway
Configured for digital signal acquisition and multi-protocol gateway execution in LinkNet platforms, the Woodward 9905-971 Rev(K) (9905-971 LinkNet Discrete Input Module and CANbus Protocol Gateway) provides direct physical/electrical execution. Operating within a 24 VDC or 9-36 VDC power range depending on variant configuration, this dual-purpose hardware captures discrete inputs through 8-16 opto-isolated channels or converts SAE J1939, CANopen, and NMEA 2000 protocols across dual ISO 11898-2 CAN ports.
Suffix Breakdown & Model Matrix
The Woodward 9905-971 Rev(K) hardware platform accommodates two distinct physical build configurations within the LinkNet product architecture:
| Suffix / Variant Designation | Physical Hardware Configuration | Input Voltage Range | Operating Temperature Range | Communication Interfaces / Channels |
|---|---|---|---|---|
| 9905-971 (Discrete Input Variant) | High-Density Digital Signal Acquisition Module | 24 VDC | -40 deg C to +70 deg C | 8-16 Opto-isolated Channels, MODBUS RTU |
| 9905-971 (CANbus Gateway Variant) | Multi-Protocol Bus Converter / Protocol Bridge | 9-36 VDC | -40 deg C to +105 deg C | 2 x ISO 11898-2 (9-pin D-Sub), SAE J1939, CANopen, NMEA 2000 |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 9905-971 Rev(K) |
| Brand | Woodward |
| Origin | USA |
| Weight | 1.82 kg |
| Dimensions | Standard LinkNet Module Dimensions |
| Operating Temp | -40 deg C to +70 deg C (Discrete Input) / -40 deg C to +105 deg C (CANbus Gateway) |
| Power Consumption / Input Voltage | 24 VDC (Discrete Input) / 9-36 VDC (CANbus Gateway) |
| Product Type | Discrete Input Modules and Protocol Gateways |
| Compatible Series | LinkNet Series |
| Discrete Channels | 8-16 Opto-isolated digital input channels |
| CAN Ports | 2 x ISO 11898-2 (9-pin D-Sub interfaces) |
| Isolation | 1500 VDC (Power to I/O) / 1500 VDC (Between CAN ports) |
| Protocols Supported | MODBUS RTU, SAE J1939, CANopen, NMEA 2000 |
| Baud Rate | 10 kbps - 1 Mbps (Gateway variant) |
| Shock Resistance | Industrial Standard / 100 g (6 ms half-sine) |
Harmonic Distortion Suppression and Thermal Dissipation Profiles
The Woodward 9905-971 Rev(K) incorporates optimized thermal heat sink dissipation profiles that enable passive ambient cooling up to +105 deg C in unconditioned outdoor enclosures. The internal power supply circuit minimizes high-frequency harmonic distortion suppression during rapid input voltage swings on 9-36 VDC power buses. Additionally, 1500 VDC galvanic isolation across both CAN ports and power-to-I/O pathways blocks ground loops and high-voltage transients from affecting core processor operations.
Frequently Asked Questions
Q: Can the Woodward 9905-971 Rev(K) support discrete signal processing and CANbus gateway conversion simultaneously within a single unit?
A: No. Operating capabilities are determined by the internal hardware assembly variant. The Discrete Input variant processes opto-isolated digital logic signals, while the Gateway variant handles protocol translation across dual CAN ports.
Q: How does the Gateway variant handle multi-protocol CAN networks on shipboard power management platforms?
A: The Gateway variant processes up to 500 Parameter Group Numbers (PGNs) per second, mapping data between SAE J1939 engine control units, NMEA 2000 marine networks, and CANopen system controllers without introducing network latency.
Q: What mounting precautions must engineers take when installing the unit near high-vibration engine machinery?
A: Installers must bolt the chassis to a rigid mounting panel equipped with vibration isolators rated for 100 g shock loads. Torque all 9-pin D-Sub connector screws and secure field terminal block wiring with thread-locking compound.
Field Installation Guidelines
Mount the module chassis vertically on an equipment panel inside a protective enclosure, maintaining clear space around thermal heat dissipation vents. Route low-voltage 24 VDC or 9-36 VDC power wiring in separate conduits from AC power cables and actuator drive lines to prevent inductive coupling. Ground all shielded twisted-pair cables for CANbus and discrete inputs at a single chassis earth terminal point. Ensure that 120-ohm termination resistors are installed at both physical ends of each CANbus segment before commissioning the system.