{"product_id":"alf111-s50-yokogawa-foundation-fieldbus-communication-module","title":"ALF111-S50 YOKOGAWA FOUNDATION Fieldbus Communication Module","description":"\u003cp\u003eThe \u003cstrong\u003eYOKOGAWA ALF111-S50\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALF111\u003c\/strong\u003e FOUNDATION Fieldbus Communication Module, operates as a dedicated hardware component for digital fieldbus device communication and bus segment management within YOKOGAWA CENTUM VP control systems.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe catalog designation for the ALF111-S50 defines specific module features:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Model (ALF111):\u003c\/strong\u003e FOUNDATION Fieldbus Communication Module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType (-S):\u003c\/strong\u003e Standard type\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplosion Protection (5):\u003c\/strong\u003e With no explosion protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOption Code (0):\u003c\/strong\u003e Basic type\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-S50\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\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Protocol\u003c\/td\u003e\n\u003ctd\u003eFOUNDATION Fieldbus H1 (31.25 kbps)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e4 fieldbus H1 segments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Bus Interface\u003c\/td\u003e\n\u003ctd\u003eCENTUM VP node backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExplosion Protection\u003c\/td\u003e\n\u003ctd\u003eNone (Standard Non-Ex)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFOUNDATION Fieldbus Connectivity and Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe ALF111-S50 interfaces up to 4 independent FOUNDATION Fieldbus H1 segments, executing deterministic cyclic publisher\/subscriber data exchanges with field transmitters and valve positioners at a fixed transmission rate of 31.25 kbps. The module provides galvanic isolation between fieldbus segments and internal backplane logic to prevent ground loop currents and cross-channel noise propagation. Operating alongside 4-20 mA HART loop protocol architectures, the ALF111-S50 facilitates direct access to digital device diagnostics and process variables without disturbing control loop integrity.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many FOUNDATION Fieldbus H1 segments can be connected to a single ALF111-S50 module?\u003c\/p\u003e\n\u003cp\u003eA: A single ALF111-S50 module supports up to 4 independent FOUNDATION Fieldbus H1 segments operating at 31.25 kbps.\u003c\/p\u003e\n\u003cp\u003eQ: Does the ALF111-S50 provide fieldbus power to connected H1 field devices?\u003c\/p\u003e\n\u003cp\u003eA: No, the ALF111-S50 acts as a communications interface card; external fieldbus power conditioners and power supplies must be installed on each H1 segment to energize field instruments.\u003c\/p\u003e\n\u003cp\u003eQ: Does the ALF111-S50 support redundant module configuration in CENTUM VP nodes?\u003c\/p\u003e\n\u003cp\u003eA: Yes, dual ALF111-S50 modules can be installed in adjacent paired slots for redundant H1 bus communication, enabling automatic switchover without interrupting segment data traffic.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003ePower down the target rack slot before inserting or removing the module. Wear a grounded ESD wrist strap during handling to protect electronic components. Align the ALF111-S50 with the module guide rails and press firmly into the backplane connector until fully seated, securing top and bottom retaining screws to ensure electrical frame ground continuity. Ensure fieldbus cable wiring complies with Type A FOUNDATION Fieldbus shielded twisted-pair specifications, and verify that external 100-ohm bus terminators are installed at both physical ends of each H1 segment. Connect cable shielding to ground at a single point to prevent ground loop currents.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":53278250434869,"sku":"ALF111-S50","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/ALF111-S001_bc2f23d0-27fa-4ec2-9b10-733614c6ce66.png?v=1786608824","url":"https:\/\/www.5gplc.com\/products\/alf111-s50-yokogawa-foundation-fieldbus-communication-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}