{"product_id":"honeywell-51304640-125-digital-input-field-termination-assembly","title":"Honeywell 51304640-125 Digital Input Field Termination Assembly","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell 51304640-125\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e51304640-125\u003c\/strong\u003e Digital Input Field Termination Assembly (FTA), operates as a dedicated hardware component for field-side signal marshalling, passive circuit routing, and galvanic isolation interface within Honeywell distributed control system networks. Configured for high-density instrumentation tracking, the 32-channel termination block provides direct physical and electrical execution to bridge discrete field wiring directly to the system's processing I\/O cards.\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\u003e51304640-125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\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\u003e0.5 kg (1.10 lbs) net assembly mass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e10.8 cm x 6.7 cm x 8.4 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Type\u003c\/td\u003e\n\u003ctd\u003eDiscrete Digital Input Field Termination\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e32 independent field inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Range\u003c\/td\u003e\n\u003ctd\u003e24 VDC nominal loop rating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Open Circuit\u003c\/td\u003e\n\u003ctd\u003e10.5 VDC maximum open circuit voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Short Circuit\u003c\/td\u003e\n\u003ctd\u003e14 mA maximum short circuit current limits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Source Resistance\u003c\/td\u003e\n\u003ctd\u003e800 ohms minimum source resistance threshold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Applied Voltage\u003c\/td\u003e\n\u003ctd\u003e250 V RMS maximum applied isolation threshold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection Terminals\u003c\/td\u003e\n\u003ctd\u003eCompression-type screw terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRedundancy Support\u003c\/td\u003e\n\u003ctd\u003eYes, dual I\/O module bus interface compatible\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 (-40 to +158 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Isolator\u003c\/td\u003e\n\u003ctd\u003ePart Number 51191699-100 (MTL4016)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDigital Input Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control \u0026amp; DCS Instrumentation Rails\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-20 mA HART Loop Protocol and Channel-to-Channel Isolation\u003c\/strong\u003e The assembly incorporates rugged traces that support independent channel routing boundaries. While managing 24 VDC discrete loops, the board structural layouts allow the integration of physical galvanic isolation barriers up to 250 V RMS. This prevents hazardous field surges or ambient ground loops from feeding backward through the termination tracks into adjacent 4-20 mA HART analog control networks sharing the cabinet enclosure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold Junction Compensation (CJC) and Signal Conversion Pathways\u003c\/strong\u003e Because this assembly functions as a discrete digital input marshalling panel rather than an analog temperature sensor termination block, it acts purely as a pass-through layer for on\/off circuit states. The copper termination paths route binary high\/low state potentials directly to processing cards without adding signal conversion delay or requiring cold junction compensation calculations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What role does this Field Termination Assembly play in system hardware redundancy?\u003c\/p\u003e\n\u003cp\u003eA: The 51304640-125 card layout includes separate backplane ribbon cable interfaces that connect the 32 field inputs concurrently to two parallel I\/O modules. If the primary processing card experiences a hardware failure, the field signals remain physically landed on this single assembly, allowing the standby module to assume control with zero wiring changes or signal disruption.\u003c\/p\u003e\n\u003cp\u003eQ: How do the specified open-circuit and short-circuit parameters impact field switch wiring?\u003c\/p\u003e\n\u003cp\u003eA: The assembly enforces a maximum open-circuit voltage of 10.5 VDC and limits short-circuit currents to 14 mA with an 800-ohm minimum source resistance. These electrical limits are optimized for low-energy proximity switches and dry contacts, preventing contact arc degradation and managing field line faults cleanly at the interface tier.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":45103086796915,"sku":"51304640-125","price":410.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-06-15_11-28-38_11c25113-7f65-4fc2-84e3-8e31ae1f94dc.png?v=1781503085","url":"https:\/\/www.dcssupplier.com\/products\/honeywell-51304640-125-digital-input-field-termination-assembly","provider":"DcsSupplier Limited","version":"1.0","type":"link"}