{"product_id":"yokogawa-mif4-a-foundation-fieldbus-h1-communication-module","title":"Yokogawa MIF4*A FOUNDATION Fieldbus H1 Communication Module","description":"\u003ch2\u003eYokogawa MIF4*A FOUNDATION Fieldbus H1 Communication Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa MIF4*A\u003c\/strong\u003e serves as the primary \u003cstrong\u003eMIF4\u003c\/strong\u003e FOUNDATION Fieldbus H1 Communication Module utilized to execute multi-channel network arbitration across Field Control Unit (FCU) platforms. Configured for low-speed voltage mode data transmission, the hardware manages physical connectivity between smart transmitters, valve positioners, and the central controller, routing deterministic signal traffic across multiple active field bus loops.\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\u003eMIF4*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\u003e0.40 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard node module sizing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eMax 2.5 W (calculated from 5 VDC, ≤0.5 A current consumption)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Type\u003c\/td\u003e\n\u003ctd\u003eFOUNDATION Fieldbus H1 (low-speed voltage mode)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePorts\u003c\/td\u003e\n\u003ctd\u003e4 ports (1 segment per port)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Speed\u003c\/td\u003e\n\u003ctd\u003e31.25 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Devices\u003c\/td\u003e\n\u003ctd\u003e32 units per segment (including the MIF4*A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003e1500 VAC (field-to-system, channel-to-channel, 1 min)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBus Connection\u003c\/td\u003e\n\u003ctd\u003eRemovable pressure clamp terminal block with switchable internal terminators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFOUNDATION Fieldbus Connectivity \u0026amp; Segment Configuration\u003c\/h3\u003e\n\u003cp\u003eThe interface module establishes communication tracks utilizing the FOUNDATION Fieldbus H1 protocol operating at a transmission speed of 31.25 kbps. To shield the processor logic from field-induced electrical disturbances, the hardware implements robust channel-to-channel isolation networks alongside field-to-system barriers rated at 1500 VAC. The card executes the role of the Link Active Scheduler (LAS) and system clock master, enforcing deterministic loop synchronization and scheduling cyclic data transfers for up to 32 field instruments per segment. Integrated physical switches allow deployment of internal terminators directly on the module board, eliminating the requirement for external termination hardware on short-run loops.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the MIF4*A manage the Link Active Scheduler (LAS) role during a dual-redundant module failure?\u003c\/p\u003e\n\u003cp\u003eA: In a dual-redundant pairing, both cards monitor the fieldbus segment concurrently. The primary online module operates as the active LAS node, maintaining the schedule for all 48 control I\/O channels per segment; if the primary hardware reports an error or encounters a bus drop, the backup module takes over the LAS token seamlessly without disrupting segment traffic.\u003c\/p\u003e\n\u003cp\u003eQ: Can the removable pressure clamp terminal blocks be disconnected while the fieldbus segments are under power?\u003c\/p\u003e\n\u003cp\u003eA: Unplugging the terminal block under power disconnects all 32 devices on that specific segment immediately, forcing associated control loops into their configured fail-safe positions. While the card supports hot-swap architecture at the backplane interface, active field wiring blocks must only be detached during isolated loop maintenance periods.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Slot Seating:\u003c\/strong\u003e Slide the module into the designated slot on the field control unit or ESB\/ER bus node unit along the rack guides. Push the module inward until the rear pins connect with the system backplane, and engage the locking clips to secure the device against low-frequency industrial vibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSegment Termination Setup:\u003c\/strong\u003e Verify the position of the built-in terminator switch before activating the field loop. If the MIF4*A sits at the physical end of the H1 trunk line, enable the internal terminator; if an external terminator exists at the field junction box, disable the onboard module switch to prevent double termination.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField Line Shielding:\u003c\/strong\u003e Connect all fieldbus cable shields together and terminate them at a single point on the master cabinet instrument ground bar. Ensure the outer shield layers remain isolated at the transmitter housings to prevent parallel ground paths from introducing digital frame errors.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43668029571162,"sku":"MIF4*A","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/581..jpg?v=1784256381","url":"https:\/\/www.spareoil.com\/ar\/products\/yokogawa-mif4-a-foundation-fieldbus-h1-communication-module","provider":"SpareOil Automation","version":"1.0","type":"link"}