{"product_id":"contact-output-module-adm51-yokogawa-adm51-2-s4","title":"Contact Output Module ADM51 | Yokogawa ADM51-2 S4","description":"\u003ch2\u003eYokogawa ADM51-2 S4 Contact Output Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for discrete switching and load isolation in CENTUM VP and CENTUM CS systems, the \u003cstrong\u003eYokogawa ADM51-2 S4\u003c\/strong\u003e (\u003cstrong\u003eADM51\u003c\/strong\u003e Contact Output Module) provides direct physical\/electrical execution. The module houses 8 independent Single Pole Double Throw (SPDT) relay contact channels designed to drive external final control elements, interlocks, and alarm annunciators. Operating directly off 24 VDC control power, the assembly provides isolated dry contact closures, keeping field electrical disturbances from penetrating internal backplane processing logic.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSuffix Code\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eFunctional Description\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eADM51\u003c\/td\u003e\n\u003ctd\u003eBase Model\u003c\/td\u003e\n\u003ctd\u003eContact Output Module (SPDT contact design)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e-2\u003c\/td\u003e\n\u003ctd\u003eContact Type \/ Configuration\u003c\/td\u003e\n\u003ctd\u003e8-channel SPDT isolated contact output variant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eS4\u003c\/td\u003e\n\u003ctd\u003eStyle Code\u003c\/td\u003e\n\u003ctd\u003eHardware style revisions for specific backplane compatibility\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\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\u003eADM51-2 S4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.2 kg net (1.0 kg packaged)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e127 mm x 25 mm x 203 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-10 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC logic power supply input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Channels\u003c\/td\u003e\n\u003ctd\u003e8 isolated SPDT contact channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Contact Current\u003c\/td\u003e\n\u003ctd\u003e1 A per output channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Switching Rating\u003c\/td\u003e\n\u003ctd\u003e250 VAC at 1 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Resistance\u003c\/td\u003e\n\u003ctd\u003e100 Mohm minimum at 500 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWithstanding Voltage\u003c\/td\u003e\n\u003ctd\u003e500 VAC dielectric isolation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4-20 mA HART Loop Protocol \u0026amp; Channel-to-Channel Isolation Integration\u003c\/h3\u003e\n\u003cp\u003eThe ADM51-2 S4 contact output module preserves system integrity by deploying complete physical channel-to-channel isolation and galvanic backplane separation rated for 500 VAC. When installed inside control enclosures carrying 4-20 mA HART loop protocol carrier frequencies or millivolt CJC (cold junction compensation) instrumentation circuits, the individual relay chambers isolate field inductive noise. This channel-to-channel architecture prevents high-voltage inductive switching transients from inducing crosstalk into nearby high-density analog signal processing cards.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the SPDT contact layout benefit field wiring configurations over SPST contacts?\u003c\/p\u003e\n\u003cp\u003eA: Each SPDT (Form C) output channel provides both normally open (NO) and normally closed (NC) contacts sharing a single common terminal, allowing field technicians to wire failsafe trip loops without adding intermediate external relays.\u003c\/p\u003e\n\u003cp\u003eQ: What are the backplane insertion limits regarding hot-swapping the ADM51-2 S4 module?\u003c\/p\u003e\n\u003cp\u003eA: Field servicing requires de-energizing external 250 VAC \/ 1 A field load circuits at the terminal block prior to extracting the module from the baseplate to prevent arcing across backplane edge connector pins.\u003c\/p\u003e\n\u003cp\u003eQ: How should inductive field loads be suppressed when wired directly to the relay outputs?\u003c\/p\u003e\n\u003cp\u003eA: An external flyback diode must be connected across 24 VDC inductive loads, or an RC snubber network across 250 VAC loads, to absorb switching back-EMF spikes and prevent contact erosion.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Arc Suppression:\u003c\/strong\u003e Install snubber circuits or suppression diodes directly across external inductive coils (solenoids, motor starters) to maintain the 1 A switching specification and protect internal SPDT contacts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCabinet Signal Separation:\u003c\/strong\u003e Maintain a minimum 200 mm clearance between SPDT output load cables carrying 250 VAC and sensitive 4-20 mA analog or communication bus wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctional Grounding:\u003c\/strong\u003e Connect the I\/O rack frame earth terminal to the main functional earth (FE) bus using low-impedance copper strap to ensure full dielectric isolation performance (500 VAC).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad Current Boundaries:\u003c\/strong\u003e Verify that the continuous switching current across each individual SPDT contact channel does not exceed 1 A under maximum ambient operating temperatures.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43796420264026,"sku":"ADM51","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/753..jpg?v=1786068566","url":"https:\/\/www.spareoil.com\/ar\/products\/contact-output-module-adm51-yokogawa-adm51-2-s4","provider":"SpareOil Automation","version":"1.0","type":"link"}