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The WOODWARD 9905-971 Rev(K), also cataloged as the 9905-971 Rev(K) Discrete Input Module, operates as a dedicated hardware component for high-speed contact state monitoring and digital signal acquisition within prime...
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The WOODWARD 9905-971 Rev(K), also cataloged as the 9905-971 Rev(K) Discrete Input Module, operates as a dedicated hardware component for high-speed contact state monitoring and digital signal acquisition within prime mover and control network platforms.
| Parameter | Specification |
|---|---|
| Model | 9905-971 Rev(K) |
| Brand | WOODWARD |
| Origin | USA |
| Weight | 1.45 kg |
| Dimensions | 150 x 100 x 40 mm |
| Operating Temp | -40 to 85 deg C (-40 to +185 deg F) |
| Power Consumption | 24 VDC (+/-10%) |
| Control Channels | 2 (Active/Active redundant) |
| Response Time | Less than 5 ms |
| Communication | Modbus TCP, OPC UA |
| Vibration Resistance | 5 Grms (IEC 60068-2-6) |
| MTBF | 500,000 hours |
The discrete input card processes contact transitions across dual active/active redundant control channels within a sub-5 ms response window. This parallel signal processing ensures deterministic loop synchronization and maintains high actuator loop feedback response during dynamic control cycles. Onboard power regulation components radiate heat through thermal heat sink dissipation profiles integrated into the 150 x 100 x 40 mm chassis, sustaining continuous operation across the -40 to 85 deg C thermal envelope.
Q: How does the dual-channel active/active redundancy function during a single channel fault?
A: Both channels process input signals simultaneously. If one channel encounters a signal loss or internal hardware fault, the secondary channel maintains uninterrupted communication over Modbus TCP or OPC UA without switching latency.
Q: What mechanisms protect internal digital circuits against external line noise?
A: High-speed optocouplers isolate incoming 24 VDC field contact lines from the internal processing unit, while digital filtering suppresses mechanical contact bounce noise.
