{"product_id":"yokogawa-afs20d-h4221-3-ndf4-3-ndr4-field-control-unit","title":"YOKOGAWA AFS20D-H4221\/3-NDF4\/3-NDR4 Field Control Unit","description":"\u003cp\u003eConfigured for high-speed process execution in CENTUM CS 3000 systems, the \u003cstrong\u003eYOKOGAWA AFS20D-H4221\/3-NDF4\/3-NDR4\u003c\/strong\u003e (\u003cstrong\u003eAFS20D-H4221\u003c\/strong\u003e Field Control Unit) provides direct electrical execution of control algorithms and I\/O management. The unit utilizes a duplexed architecture to maintain control continuity, requiring precise synchronization between the active and standby modules to ensure zero-latency failover across the network backbone.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAFS20D\u003c\/strong\u003e: Base model for the field control unit with duplexing capability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-H4221\/3\u003c\/strong\u003e: Version and hardware revision for high-speed processor execution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNDF4\u003c\/strong\u003e: Configuration code for primary FIO (Fieldbus I\/O) communication interface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNDR4\u003c\/strong\u003e: Configuration code for redundant network data communication interface.\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\u003eAFS20D-H4221\/3-NDF4\/3-NDR4\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\u003e3.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard CS 3000 control unit footprint\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\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eSubject to system bus load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor\u003c\/td\u003e\n\u003ctd\u003eHigh-speed control core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRedundancy\u003c\/td\u003e\n\u003ctd\u003eDuplexed configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eFIO \/ V-net\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel-to-Channel Isolation and Loop Connectivity\u003c\/h3\u003e\n\u003cp\u003eThe AFS20D-H4221\/3-NDF4\/3-NDR4 is designed for integration with standard 4-20 mA HART loop protocol environments. The unit architecture includes channel-to-channel isolation on the interface cards to maintain signal integrity within complex electromagnetic environments. By implementing strict electrical separation, the unit prevents ground loops and transient voltage surges from propagating across the control network. Data throughput is optimized through hardware-level handshake control, minimizing latency in the command-response cycles typical of DCS process loops.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the AFS20D duplexed pair support hot-swapping during process execution?\u003c\/p\u003e\n\u003cp\u003eA: Yes. In a redundant configuration, the standby module can be extracted and replaced while the primary module maintains active control, provided the system status indicates a successful handover state.\u003c\/p\u003e\n\u003cp\u003eQ: How is the synchronization maintained between the duplexed units?\u003c\/p\u003e\n\u003cp\u003eA: Synchronization is managed through a dedicated high-speed tracking bus integrated into the control backplane. This bus ensures that the standby module continuously mirrors the memory state and control output values of the active module.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eVerify that the 24 VDC power supply is switched to the OFF position prior to inserting the modules into the baseplate.\u003c\/li\u003e\n\u003cli\u003eAlign the modules carefully with the dedicated rack guide rails; ensure the backplane connectors engage without mechanical resistance.\u003c\/li\u003e\n\u003cli\u003eSecure the modules using the front-panel locking levers to ensure sufficient chassis grounding and mechanical stability against site vibration.\u003c\/li\u003e\n\u003cli\u003eUtilize shielded cables for all field communication connections. Ensure the cable shield is bonded to a clean earth ground at the control cabinet entry point to mitigate common-mode noise.\u003c\/li\u003e\n\u003cli\u003eConfirm that the system software configuration recognizes the duplexed pair as a single logical controller before enabling the control loops.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":50115051127036,"sku":"AFS20D-H4221\/3-NDF4\/3-NDR4","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/AFS40D-H4113.jpg?v=1784165736","url":"https:\/\/www.electronicplc.com\/products\/yokogawa-afs20d-h4221-3-ndf4-3-ndr4-field-control-unit","provider":"Electronic PLC","version":"1.0","type":"link"}