{"product_id":"yokogawa-afg84d-h4123-duplexed-field-control-unit","title":"Yokogawa AFG84D-H4123 Duplexed Field Control Unit","description":"\u003carticle\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAFG84D-H4123\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efrom Yokogawa is a duplex Field Control Unit engineered for continuous, high-availability operation in CENTUM VP and CS 3000 distributed control systems.\u003cbr\u003eIt combines redundant processing architecture, dual Vnet\/IP communication paths, and flexible power input options to ensure stable control execution in critical plant environments.\u003c\/p\u003e\n\u003cp\u003eThis FCU serves as the central controller for Yokogawa Field I\/O (FIO) nodes, handling real-time control logic, I\/O scanning, and network communication with deterministic performance.\u003cbr\u003eBy integrating hardware redundancy at multiple levels, the unit minimizes single-point failures and supports seamless operation during component faults or maintenance.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCore Architecture and Capabilities\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAFG84D-H4123\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis built around a duplex control configuration, allowing two synchronized control paths to operate simultaneously.\u003cbr\u003eAutomatic switchover mechanisms ensure uninterrupted control if one path experiences failure.\u003c\/p\u003e\n\u003cp\u003eDual Vnet\/IP interfaces provide fault-tolerant communication with higher-level systems, while the CP461 processor module delivers high-speed execution of control strategies, interlocks, and sequence logic.\u003c\/p\u003e\n\u003cp\u003eThe unit is designed for long-term deployment in demanding industrial environments, supporting stable operation across extended temperature ranges and continuous duty cycles.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Functional Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eSupports fully redundant Vnet\/IP network communication for high system availability\u003cbr\u003eImplements dual power supply inputs to eliminate power-related single points of failure\u003cbr\u003eIntegrates CP461 control processor for fast and deterministic control execution\u003cbr\u003eNative compatibility with Yokogawa FIO modules and remote I\/O architectures\u003cbr\u003eDesigned for continuous operation in safety-critical and mission-critical processes\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eAFG84D-H4123\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003cbr\u003eYokogawa Electric Corporation\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eControl Architecture\u003c\/strong\u003e\u003cbr\u003eDuplexed Field Control Unit\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProcessor Module\u003c\/strong\u003e\u003cbr\u003eCP461\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNetwork Interface\u003c\/strong\u003e\u003cbr\u003eDual-redundant Vnet\/IP\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSupported Systems\u003c\/strong\u003e\u003cbr\u003eCENTUM VP\u003cbr\u003eCENTUM CS 3000\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower Input Options\u003c\/strong\u003e\u003cbr\u003e100–120 V AC\u003cbr\u003e220–240 V AC\u003cbr\u003e24 V DC\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003cbr\u003eApprox. 200 VA at 100–120 V AC\u003cbr\u003eApprox. 230 VA at 220–240 V AC\u003cbr\u003eApprox. 5.5 A at 24 V DC\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMounting Method\u003c\/strong\u003e\u003cbr\u003e19-inch standard control rack\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSystem Integration and Reliability\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAFG84D-H4123\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis optimized for integration within Yokogawa’s distributed control architecture.\u003cbr\u003eIt supports seamless communication with operator stations, engineering stations, and higher-level plant networks through Vnet\/IP, while maintaining deterministic control at the field level.\u003c\/p\u003e\n\u003cp\u003eRedundant power and communication design significantly reduce downtime risk, making this FCU suitable for plants with strict uptime and safety requirements.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTypical Application Areas\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eOil and gas production and refining facilities\u003cbr\u003ePetrochemical and chemical processing plants\u003cbr\u003eThermal and combined-cycle power generation\u003cbr\u003eMetals, pulp and paper, and large-scale manufacturing\u003cbr\u003eUtilities and infrastructure systems requiring 24\/7 control availability\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCan the AFG84D-H4123 operate with single power input if redundancy is not required?\u003c\/strong\u003e\u003cbr\u003eYes. While designed for redundant power supply operation, the unit can function with a single power input depending on system design.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this FCU compatible with legacy CENTUM systems?\u003c\/strong\u003e\u003cbr\u003eThe AFG84D-H4123 is primarily intended for CENTUM VP and CS 3000. Compatibility with older systems depends on system configuration and migration strategy.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the unit support online maintenance and module replacement?\u003c\/strong\u003e\u003cbr\u003eYes. The duplex architecture allows maintenance activities to be performed without stopping control execution when properly configured.\u003c\/p\u003e\n\u003c\/article\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":42877330686042,"sku":"AFG84D-H4123","price":264.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/AFG84D-H4123.jpg?v=1770190185","url":"https:\/\/www.plcmasters.com\/uk\/products\/yokogawa-afg84d-h4123-duplexed-field-control-unit","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}