{"product_id":"alf111-s51-yokogawa-centum-vp-foundation-fieldbus-module","title":"ALF111-S51 Yokogawa CENTUM VP FOUNDATION Fieldbus Module","description":"\u003ch2\u003eYokogawa ALF111-S51 Fieldbus Communication Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa ALF111-S51\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALF111\u003c\/strong\u003e FOUNDATION Fieldbus Communication Module, operates as a dedicated hardware component for digital communication interface for FF H1 devices within Yokogawa CENTUM VP control platforms.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe complete catalog number ALF111-S51 represents a specific hardware configuration defined by its suffix string:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eALF111\u003c\/strong\u003e: Base model code for FOUNDATION Fieldbus H1 communication module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-S\u003c\/strong\u003e: Standard performance execution layout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5\u003c\/strong\u003e: Non-explosion proof rating option.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\u003c\/strong\u003e: Conformal coating meeting ISA Standard G3 environmental resistance requirements.\u003c\/li\u003e\n\u003c\/ul\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\u003eALF111-S51\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\u003e0.40 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eCompact modular rack-slot format\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 6 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocol\u003c\/td\u003e\n\u003ctd\u003eFOUNDATION Fieldbus H1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Rate\u003c\/td\u003e\n\u003ctd\u003e31.25 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Device Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 32 devices per segment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Isolation\u003c\/td\u003e\n\u003ctd\u003eComplete bus-to-system isolation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e24 VDC backplane powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDCS Process Control \u0026amp; FOUNDATION Fieldbus Protocol Execution\u003c\/h3\u003e\n\u003cp\u003eThe ALF111-S51 card establishes deterministic link communication across FOUNDATION Fieldbus H1 network segments while maintaining isolated signal integrity across system backplanes. Integrated Link Active Scheduler (LAS) logic controls bus token passing and execution timing loops for connected field instruments. Furthermore, the module handles digital telemetry streams and 4-20 mA HART loop protocol translation routines while maintaining channel-to-channel isolation. Internal software algorithms continuously perform cold junction compensation (CJC) processing for connected remote thermal transmitters to eliminate noise drift on primary control loops.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can maintenance teams hot-swap the ALF111-S51 module inside an active Field Control Station slot?\u003c\/p\u003e\n\u003cp\u003eA: Personnel can extract and replace the module during powered operation only when the target rack incorporates a dual-redundant ALF111 communication card pair.\u003c\/p\u003e\n\u003cp\u003eQ: How does the ISA Standard G3 conformal coating option protect internal module circuitry?\u003c\/p\u003e\n\u003cp\u003eA: The G3-rated protective layer prevents atmospheric hydrogen sulfide and chlorine gas contaminants from corroding internal copper traces and solder points.\u003c\/p\u003e\n\u003cp\u003eQ: Does removing the active Link Active Scheduler module cause total communication failure on the field segment?\u003c\/p\u003e\n\u003cp\u003eA: A backup LAS device on the fieldbus segment assumes bus scheduling duties automatically when the primary ALF111-S51 module disconnects.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInsert the card straight into the designated rack slot until the upper and lower locking levers click completely into place.\u003c\/li\u003e\n\u003cli\u003eTerminate both ends of the FOUNDATION Fieldbus H1 segment with approved RC network bus terminators to maintain 100 ohm characteristic impedance.\u003c\/li\u003e\n\u003cli\u003eAttach field wiring shield drain conductors directly to the dedicated instrumentation ground bus bar rather than the module frame ground.\u003c\/li\u003e\n\u003cli\u003eMaintain a minimum clearance of 50 mm above and below the card housing to facilitate natural vertical convection cooling.\u003c\/li\u003e\n\u003cli\u003eSegregate FOUNDATION Fieldbus H1 twisted-pair cables from high-voltage AC lines in separate cable trays to prevent inductive noise coupling.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43881921249370,"sku":"ALF111-S51","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/865..jpg?v=1787278250","url":"https:\/\/www.spareoil.com\/products\/alf111-s51-yokogawa-centum-vp-foundation-fieldbus-module","provider":"SpareOil Automation","version":"1.0","type":"link"}