{"product_id":"yokogawa-alf111-s00-foundation-fieldbus-communication","title":"Yokogawa ALF111-S00 FOUNDATION Fieldbus Communication","description":"\u003cp\u003eThe \u003cstrong\u003eYokogawa ALF111-S00\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALF111\u003c\/strong\u003e FOUNDATION Fieldbus Communication Module, operates as a dedicated hardware component for Link Active Scheduler (LAS) management and H1 fieldbus segment distribution within distributed control system (DCS) platforms.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe ALF111 series utilizes explicit engineering suffixes to define hardware builds and hardware style revisions. Below is the technical breakdown for the \u003cstrong\u003eALF111-S00\u003c\/strong\u003e configuration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eALF111\u003c\/strong\u003e: Core base model designator for the FOUNDATION Fieldbus H1 communication module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-S\u003c\/strong\u003e: Standard type construction baseline for standard industrial enclosure installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0\u003c\/strong\u003e: Phase indicator slot mapping designator.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0\u003c\/strong\u003e: Basic functionality block revision baseline.\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-S00\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\u003e0.3 kg (0.66 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e127 mm x 25 mm x 127 mm (5.0\" x 1.0\" x 5.0\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e1.5 W maximum rated draw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eFieldbus Communication Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Interface\u003c\/td\u003e\n\u003ctd\u003e2-wire FOUNDATION Fieldbus H1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Speed\u003c\/td\u003e\n\u003ctd\u003e31.25 Kbps fixed transmission rate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDielectric Strength\u003c\/td\u003e\n\u003ctd\u003eWithstanding voltage of 1500 VAC per minute from field to system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBus Connection\u003c\/td\u003e\n\u003ctd\u003ePressure clamp terminals on a removable terminal block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSegment Termination\u003c\/td\u003e\n\u003ctd\u003eBuilt-in software-selectable or hardware terminators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDevice Capacity\u003c\/td\u003e\n\u003ctd\u003eMaximum 32 fieldbus devices per segment loop\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Capacity\u003c\/td\u003e\n\u003ctd\u003eSupports up to 48 control I\/O points per segment loop\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRedundancy Support\u003c\/td\u003e\n\u003ctd\u003eDual-redundant configuration pairing compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTarget Control Units\u003c\/td\u003e\n\u003ctd\u003eMounts on AFV10, AFV30, AFV40, AFF50, and ESB \/ ER bus node units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control System Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFOUNDATION Fieldbus \/ Profibus PA Connectivity\u003c\/strong\u003e Operating as a Link Active Scheduler (LAS) master node and designated Clock Master, the module maintains strict deterministic control over the 31.25 Kbps H1 segment loop. It governs macrocycle execution timings, synchronizes clock signals across downstream field nodes, and transfers periodic process variables directly into the central DCS database for regulatory control loop execution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeterministic Processor Offloading and Redundancy Pairing\u003c\/strong\u003e The module manages synchronous scheduled communications and asynchronous messaging internally, ensuring network traffic routines do not introduce execution jitter to the main Field Control Station (FCS). Dual-redundant pairing options support installing two ALF111 units in the same node slot layer to manage automatic bump-less transfer of the LAS roll during an active hardware fault.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What are the consequences if a module running as the active Link Active Scheduler (LAS) fails on the H1 loop?\u003c\/p\u003e\n\u003cp\u003eA: If the primary ALF111-S00 fails in a non-redundant layout, a configured backup LAS device located directly on the field network segment detects the loss of the scheduling token and automatically assumes control of the macrocycle execution timing to prevent loss of process data.\u003c\/p\u003e\n\u003cp\u003eQ: Can the ALF111-S00 directly power the 32 fieldbus transmitters connected to its H1 segment loop?\u003c\/p\u003e\n\u003cp\u003eA: No. The communication module does not inject operating power into the signal lines. An external, dedicated fieldbus power supply paired with an impedance-matching fieldbus power conditioner must be installed on the H1 network segment to drive connected transmitters and valves.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":47621286232254,"sku":"ALF111-S00","price":3000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-06-11_15-35-51.png?v=1781164399","url":"https:\/\/www.autooiltech.com\/ar\/products\/yokogawa-alf111-s00-foundation-fieldbus-communication","provider":"AutoOilTech Limited","version":"1.0","type":"link"}