{"product_id":"mc-tdia12-honeywell-51304439-175-120vac-digital-input-board","title":"MC-TDIA12 Honeywell 51304439-175 120VAC Digital Input Board","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eHoneywell MC-TDIA12 (Part No. 51304439-175)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-performance, 12-channel isolated digital input board engineered for the Experion PKS and legacy TDC 3000 control environments. This module captures discrete ON\/OFF signals from critical field devices, including limit switches, pushbuttons, and relay contacts. By converting 120VAC field signals into precise digital data, it enables the DCS to monitor plant-wide processes with absolute accuracy. We supply this board as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% brand new and original\u003c\/strong\u003e, ensuring full compatibility with mission-critical safety and control loops.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMC-TDIA12\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e51304439-175\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Channels\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12 Independent Channels\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e120 VAC Nominal\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIsolation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eChannel-to-Channel \u0026amp; Channel-to-System\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eUpdate Rate\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e≤25 ms per channel\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e46.2 cm x 12 cm x 5 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.14 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e6–8 W\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e–20°C to +55°C (Extended to +70°C)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUSA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSuperior Signal Isolation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis board employs robust galvanic isolation between channels and the system backplane. This architecture blocks high-voltage transients and prevents ground loops from damaging the central processor, ensuring stable operation in electrically noisy environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Voltage AC Compatibility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSpecifically designed for 120VAC logic, the MC-TDIA12 interfaces directly with standard industrial power circuits. It eliminates the need for interposing converters, reducing cabinet complexity and potential points of failure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAdvanced Fault Diagnostics:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBuilt-in self-test routines and channel health monitoring detect circuit abnormalities before they cause system downtime. The module reports fault conditions directly to the Experion PKS console, streamlining maintenance and troubleshooting.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRapid Signal Processing:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWith an update rate of ≤25 ms, the board captures rapid state changes in real-time. This high-speed response is vital for sequence-of-events (SOE) recording and emergency shutdown triggers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLegacy \u0026amp; Modern Integration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe board maintains seamless connectivity with both legacy TDC 3000 systems and modern Experion PKS architectures, allowing for cost-effective hardware migration and plant upgrades.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the MC-TDIA12 support 24VDC signals?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No. While the internal logic interfaces with the controller, this specific hardware version (51304439-175) is optimized for 120VAC field signals. Using 24VDC on these inputs may result in failed logic state recognition.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this board replace older 51304439 series boards?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. The 51304439-175 serves as a direct functional replacement for earlier revisions within the MC-TDIA12 family. It fits existing system racks and uses standard Honeywell field termination assemblies (FTAs).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How should I handle the installation to prevent ESD damage?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Always use a grounded wrist strap during installation. Mount the board directly into the designated system rack or DIN rail slot, ensuring the pins align perfectly with the backplane connector before applying pressure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this unit refurbished or surplus?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: We provide only\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% brand new and original\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eHoneywell equipment. Each board arrives in factory-sealed packaging with a full manufacturer-standard 12-month warranty, ensuring it meets the stringent E-E-A-T requirements of industrial procurement.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":44164629233763,"sku":"MC-TDIA12 51304439-175","price":320.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/523._9a1f51e2-510b-4920-bcd0-a49e20fcca3d.jpg?v=1778039522","url":"https:\/\/www.autocontrolglobal.com\/products\/mc-tdia12-honeywell-51304439-175-120vac-digital-input-board","provider":"AutoControl Global","version":"1.0","type":"link"}