{"product_id":"woodward-9905-971-revl-discrete-input-module","title":"WOODWARD 9905-971 Rev(L) Discrete Input Module","description":"\u003cp\u003eConfigured for fault-tolerant contact state monitoring and real-time event logging across turbine control system architectures, the \u003cstrong\u003eWOODWARD 9905-971 Rev(L)\u003c\/strong\u003e (\u003cstrong\u003e9905-971 Rev(L)\u003c\/strong\u003e Discrete Input Module) provides direct physical\/electrical execution.\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 Rev(L)\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\u003e1.45kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard LinkNet module enclosure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C (-40 to +185 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC nominal wetting power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e24 discrete inputs (isolated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eScan Update Time\u003c\/td\u003e\n\u003ctd\u003e5 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTime Stamping\u003c\/td\u003e\n\u003ctd\u003e1 ms resolution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Configurations\u003c\/td\u003e\n\u003ctd\u003e6 redundant output relays with latent fault readback\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 Thermal Dissipation Profiles\u003c\/h3\u003e\n\u003cp\u003eThe module processes 24 isolated discrete input signals at a rapid 5 ms update rate with 1 ms time-stamping resolution. Onboard readback circuitry executes continuous latent fault detection across relay pairs without disrupting output control states, optimizing system fault-tolerance and actuator loop feedback response. Integral power conversion circuits distribute thermal energy evenly across internal heat sink dissipation profiles, ensuring long-term operational stability within high-density control cabinets.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the latent fault detection logic test relay outputs without interrupting system control?\u003c\/p\u003e\n\u003cp\u003eA: Integrated readback circuitry cycles relay contact pairs and verifies physical state transitions. If an incorrect state or contact welding is detected, the diagnostic circuit reports an error and halts further testing without altering the active control output state.\u003c\/p\u003e\n\u003cp\u003eQ: What grounding procedure is required for the fully isolated 24 VDC contact wetting inputs?\u003c\/p\u003e\n\u003cp\u003eA: Because each discrete input circuit is galvano-isolated, a common DC reference potential must be established between the 24 VDC wetting supply and the input group common terminals to prevent floating voltage errors.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the module chassis securely onto a standard DIN rail or enclosure backplate inside an IP54-rated metal protective enclosure.\u003c\/li\u003e\n\u003cli\u003eConnect external 24 VDC contact wetting power supply leads to designated input terminals, verifying polarity alignment.\u003c\/li\u003e\n\u003cli\u003eWire field switch contact lines to terminal block channels using shielded cables, establishing a shared common reference point.\u003c\/li\u003e\n\u003cli\u003eGround the overall cable shield at the main chassis protective earth point to prevent common-mode electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eMaintain standard cabinet air clearance above and below the housing to facilitate natural thermal heat sink dissipation during continuous operation.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":50734072758524,"sku":"9905-971 Rev(L)","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/9905-971_Rev_K.jpg?v=1785289630","url":"https:\/\/www.electronicplc.com\/es\/products\/woodward-9905-971-revl-discrete-input-module","provider":"Electronic PLC","version":"1.0","type":"link"}