{"product_id":"woodward-9905-971-linknet-discrete-input-modules","title":"Woodward 9905-971 LinkNet Discrete Input Modules","description":"\u003ch2\u003eWoodward 9905-971 LinkNet Discrete Input Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for high-density distributed I\/O acquisition in Woodward LinkNet control architectures, the \u003cstrong\u003eWoodward 9905-971\u003c\/strong\u003e (\u003cstrong\u003e9905-971\u003c\/strong\u003e LinkNet Discrete Input Module) provides direct physical\/electrical execution. This hardware component interfaces up to 16 independent discrete inputs, converting physical field switch transitions, relay states, and digital sensor contacts into deterministic logic data. The digitized status parameters are transmitted directly across the proprietary LinkNet serial bus to central Woodward MicroNet or Atlas control platforms.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e9905-971\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eWoodward\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.50 kg (1.11 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e12.7 cm x 2.5 cm x 20.3 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e1.92 W maximum (calculated based on max 24 VDC parameters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware Revision\u003c\/td\u003e\n\u003ctd\u003eRev J\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eLinkNet Discrete Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Count\u003c\/td\u003e\n\u003ctd\u003e16 Independent Discrete Inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Input Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e18-32 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Current\u003c\/td\u003e\n\u003ctd\u003e5 mA per channel at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Bus\u003c\/td\u003e\n\u003ctd\u003eProprietary LinkNet Serial Interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eOptical isolation between field circuitry and internal logic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostic Indicators\u003c\/td\u003e\n\u003ctd\u003eFront-panel LEDs for Power, Module Status, and Bus Activity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eActuator Loop Feedback Response and Engine Control Dynamics\u003c\/h3\u003e\n\u003cp\u003eThe module executes high-speed signal capturing to match strict actuator loop feedback response parameters in speed-governing topologies. Internal optical isolation grids decouple the 18-32 VDC field-side inputs from the core logic processing framework, maintaining structural integrity against voltage transients during high-speed valve actuation. The hardware layout suppresses harmonic distortion profiles common to heavy industrial engine envelopes, preventing false triggers on the 16 independent channels. Continuous registration of digital switch transitions feeds real-time status arrays back into the control loop, stabilizing fast-acting fuel regulation valves and auxiliary system controls.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 9905-971 module support live hot-swapping on an active LinkNet serial bus?\u003c\/p\u003e\n\u003cp\u003eA: No, standard system constraints require power de-energization before removing or inserting the module. Hot-swapping risks generating electrical noise and disrupting continuous bus communication to adjacent modules on the LinkNet loop.\u003c\/p\u003e\n\u003cp\u003eQ: What is the primary method for verifying data transmission health over the serial line?\u003c\/p\u003e\n\u003cp\u003eA: Engineers must monitor the front-panel Bus Activity LED. Consistent flashing indicates valid active serial queries, whereas a steady off or red status indicates a break in deterministic bus timing.\u003c\/p\u003e\n\u003cp\u003eQ: How does the hardware handle input contact bouncing common to mechanical relays?\u003c\/p\u003e\n\u003cp\u003eA: The module relies on internal hardware filtering parameters to validate the 24 VDC field voltage, ensuring that only sustained physical transitions outside the nominal contact bounce window register as valid states.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMounting procedures dictate securing the module into its designated slot within the industrial enclosure using the integrated mounting brackets to resist high-vibration engine environments. Ensure the operating environment stays within the -40 to +70 deg C limits and check that clear airflow surrounds the chassis housing.\u003c\/p\u003e\n\u003cp\u003eField wiring requires the use of multi-conductor twisted-pair shielded cables for all 16 discrete inputs. Technicians must route the 24 VDC field circuit wires completely separate from high-power AC or motor drive wiring, maintaining a minimum structural clearance of 300 mm inside the cable ducts. Terminate the overall cable shield at one end only, bonding it directly to the low-impedance master cabinet ground bar via short, solid grounding straps to eliminate ground loop currents. All electrical connections must be verified to ensure proper contact pressure before commissioning the network loop.\u003c\/p\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":42870870311002,"sku":"9905-971","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/151_b947d1fd-ae2a-453e-be9d-b683b570c6d3.jpg?v=1772596851","url":"https:\/\/www.spareoil.com\/products\/woodward-9905-971-linknet-discrete-input-modules","provider":"SpareOil Automation","version":"1.0","type":"link"}