{"product_id":"mro-234-a-yokogawa-relay-output-module-interface-card","title":"MRO-234-A Yokogawa Relay Output Module Interface Card","description":"\u003ch2\u003eYokogawa MRO-234-A Relay Output Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for discrete signal switching in CENTUM VP and CS 3000 control architectures, the \u003cstrong\u003eYokogawa MRO-234-A\u003c\/strong\u003e (\u003cstrong\u003eMRO-234\u003c\/strong\u003e Relay Output Module) provides direct physical execution of relay-based status outputs to field devices.\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\u003eDescription\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMRO-234\u003c\/td\u003e\n\u003ctd\u003eBase Model: Relay Output Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e-A\u003c\/td\u003e\n\u003ctd\u003eStyle A: Standard Relay Interface\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\u003eMRO-234-A\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\u003e0.22 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e99 mm x 100 mm x 40 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e20 mA per point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Rating\u003c\/td\u003e\n\u003ctd\u003e10 A (250 VAC \/ 30 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003e2000 Vrms (input-output)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching Time\u003c\/td\u003e\n\u003ctd\u003e5 ms (ON) \/ 3 ms (OFF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDCS Process Control Connectivity\u003c\/h3\u003e\n\u003cp\u003eThe MRO-234-A module facilitates high-isolation interfacing between DCS logic and field instrumentation. It utilizes channel-to-channel isolation to prevent potential fault propagation from external high-load circuits into the low-voltage control bus. The module ensures precise signal conditioning, maintaining the integrity of the 4-20 mA HART loop protocol when integrated into secondary control loops. Cold junction compensation (CJC) is not required for this discrete relay module; however, signal stability relies on maintaining the specified 18-30 VDC input range to ensure consistent electromagnetic coil activation within the relays.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the MRO-234-A support hot-swapping during active operation?\u003c\/p\u003e\n\u003cp\u003eA: No. The MRO-234-A is designed for fixed installation. Power must be isolated from the relay board before any maintenance or module removal to prevent accidental activation of field devices or short-circuiting of the control signals.\u003c\/p\u003e\n\u003cp\u003eQ: What is the recommended service life for the internal relay contacts?\u003c\/p\u003e\n\u003cp\u003eA: The relay contact service life is dependent on the load characteristics (inductive vs. resistive). At the rated 10 A load, contact wear is accelerated; ensure that suppressors are utilized for inductive loads (e.g., solenoids, motors) to extend the operational life of the relay points.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Secure the module to the DIN rail or backplane. Ensure adequate clearance around the module to allow for natural convection cooling, as relay operation generates thermal energy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e Use pressure clamp terminals for all field connections. Verify that wire gauge is appropriate for the current load to minimize resistive heating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e Connect the module chassis ground to the cabinet's common earth bar. A low-impedance ground path is required for the internal isolation circuitry to maintain the 2000 Vrms rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironment:\u003c\/strong\u003e Avoid mounting the module in areas with extreme vibration or high levels of conductive dust, which can compromise the relay contacts and enclosure integrity.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43655311327322,"sku":"MRO-234*A","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/214._0b185d45-7486-4a3f-85c1-e325f585e1b0.jpg?v=1783996049","url":"https:\/\/www.spareoil.com\/products\/mro-234-a-yokogawa-relay-output-module-interface-card","provider":"SpareOil Automation","version":"1.0","type":"link"}